Analyzing effect of fluid flow on surface subsidence
|
|
- Colin Pitts
- 6 years ago
- Views:
Transcription
1 Analyzing effect of fluid flow on surface subsidence in mining area Y. Abousleiman", M. Bai\ H. Zhang', T. Liu" and J.-C. Roegiers* a. School of Engineering and Architecture, The Lebanese American University, Byblos, Lebanon b. Rock Mechanics Institute, The University of Oklahoma, Norman, OK, U.S.A. c. China Coal Research Institute, Beijing, China Abstract This paper presents an analysis of the mechanisms related to surface subsidence over a longwall mining region where ground water inflow into the mining panel occurs concurrently with the overburden deformation. The finite element analysis is based on the theory of poroelasticity for dual-porosity media in which natural fractures embedded in the porous formation provide significant flow paths and deformability as well as the interaction with the host rock mass, that renders in the subsidence simulation substantially different from the traditional singleporosity approach or sole rock mechanics approach. 1 Introduction Surface subsidence is a common phenomenon in mining industry. Accurate prediction of surface subsidence is crucial to protect surface structures vulnerable to mining activities. In mining industry, the subsidence has been primarily considered due to the mining-induced destruction of overlying strata. Other factors of influence are rarely investigated. The present study is aimed at providing numerical evidences that fluid inflow into mining panel, as a result of the discharge from the overlying aquifers through mining induced fractures, may also contribute significantly to the surface subsidence. This is especially important where the measured surface subsidence shows the magnitudes unproportional to the mined seam thickness, and where the related overburden groundwater flow is substantial. The subsidence due to mining and fluid flow is a coupled phenomenon, in which the poroelastic behavior of overlying strata indicates the typical response to the external disturbance. For the naturally fractured overburden,
2 236 Computer Methods in Water Resources IV the dual-porosity poroelastic approach appears to be more suitable because the fluid flow and rock deformation are more realistically characterized in accordance with the interactive behavior between highly conductible fractures and high storage porous matrix blocks. The behavior of naturally fractured media is considerably different from that of conventional media comprised solely of intergranular porosity. In comparison with the conventional single-porosity media, dual-porosity media appear to produce greater displacement due to larger compliance, which is demonstrated by more substantial surface subsidence over the mined area. However, the response of fluid pressure to the external disturbance appears to be slower for the dual-porosity media due to the initial fluid interchange between matrix blocks and fractures. For a mining case in the fractured porous media,fluiddrainage into a mined void can be sudden and disruptive as a result of this interporosity flow. The detailed description about the dual-porosity poroelasticity can be referred to Elsworth and Bai* and Bai et al.^ In addition to conducting parametric analysis, the objectives of present investigation are to provide some quantified results showing the differences in terms of subsidence magnitudes between the traditional rock mechanics approach and the poroelastic approach. The dual-porosity concept is implied in the analysis, in which more parameters than the single-porosity concept are applied to provide additional modelingflexibility.the analysis of interporosity flow between fractures and matrix blocks is omitted because the primary focus is on the identification of the difference in subsidence between pure rock deformation and flow-dependent rock deformation. 2 Model description The finite element model used in this study was introduced by Elsworth and Bai.* The horizontal symmetry is applied in the finite element mesh design, as shown in Figure 1, where half of the domain is depicted. The simulated mining conditions are: (a) mining depth 400 m, (b) extracted thickness 2 m, (c) mining width 140 m (70 m shown in the mesh). The 2- D model represents the plane strain configuration. The external force and inflow boundary conditions, as a result of gravitational loading and excavation, are shown in Figure 2, respectively. In the initial calculation, three types of materials are assumed, i.e.: (1) overburden and under bur den, (2) coal seam, and (3) gob. The porous media is fully saturated. The fluid flowing into the panel is simultaneously pumped out, resulting in the dissipation of overburden pore pressure, thus causing strata compaction. This flow activity is accompanied by the narrowing of original panel height under the equivalent overburden load, while the latter also induces subsidence. Since there is no additional fluid recharge outside the domain, the domain boundary is impermeable except on the surface which is free from any fluid sources.
3 Computer Methods in Water Resources IV ' J I I I 1 I" 1 ' I I I ( Distance from centcriine (m) ' Figure 1: Finite element mesh layout. 3 Sensitivity study There are basically nine independent parameters for each designated material in the dual-porosity poroelastic analysis,* as illustrated in Table 1, which lists the average values, corresponding to medium fractured porous rocks for underburden, where the subscripts 1 and 2 represents matrix and fracture, respectively. For a general analysis in which the interest focuses on the profile rather than on the magnitude, most displacements and pressures are normalized against maximum possible values. The normalized subsidence versus elastic modulus for different time frames after the initial loading is given in Figure 2. The subsidence changes are more significant at smaller modulii, showing nonlinear relationship in general. The previous evidence indicates that the rocks embedded in the fluid saturated formations usually yield lower elastic modulii than those measured from the dry sites (Liu, 1984). As an inference from Figure 2, the lower modulii may imply more significant flow-deformation impacts. The distributions of the normalized subsidence over and under the centerline of the panel at various times are shown in Figure 3. Several observations can be made as: (a) larger subsidence occurs at later times; (b) positive subsidence in the overburden indicates compaction; (c) ground heave occurs in the underburden; (d) subsidence is in general uniformly distributed except at the earlier time; and (e) the largest subsidence appears at the panel
4 238 Computer Methods in Water Resources IV 0.00 i Maximum subsidence is the subsidence t=le+08 days J I 1 I I I I I I I I I I I I I I 1EH 1E+5 Elastic Modulus El (MPa) 1E+6 Figure 2: Subsidence versus elastic modulus. roof. In contrast, the normalized pore pressure distributions at various times along the centerline are depicted in Figure 4. It may be observed that: (a) relatively higher pressures are developed near the panel where ground water is drained into the panel, which occur at earlier time; and (b) pore pressure decreases significantly with the elapse of time. Final time indicates that the pore pressure completely dissipates when the subsidence reaches the maximum value, signifying the end of a transient consolidation process. By modifying over- and underburden elastic modulus, temporal subsidences are shown in Figure 5. It is seen that the magnitude of subsidence is nonlinearily proportional to that of time. During the evaluated period, the subsidence increases about four times with the reduction of the elastic modulus being only two and half times. The temporal pore pressure distributions subjected to different elastic modulii are depicted in Figure 6, while the difference in the maximum pressures is smaller than that in elastic modulii. This relatively smaller influence is expected since the mechanical properties has an indirect and therefore lesser impact on the changes in fluid pressure. One interesting observation is the slight pressure increase over the original magnitudes at earlier time, a well known Mandel effect. ^ Figure 7 compares the temporal development of normalized surface subsidence at the trough center for the domain with three types of dual-porosity
5 Computer Methods in Water Resources IV Time=10day Time = 100day Normalized subsidence Figure 3: Subsidence along centerline of the panel i iii t iii. \ i\ i \ / Legend Time =1 day Time=10day Time = 100 day Time = 1000 day Normalized pore pressure 1.00 Figure 4: Pore pressure along centerline of the panel.
6 240 Computer Methods in Water Resources IV 0.00 i Legend E = 5e+04MPa E = 2e+04MPa I I '"'""I '"'""I ' i"im -r-mmi '"'""I '"'""I '"'""I '"'""I '"'""I E+1 1E+2 1E+3 1E-+4 1E+5 1E46 1E+7 1E+8 Time (day) Figure 5: Temporal subsidence i J I n linn) i i mini ' ' Him; i i nun; i i mm; i i nun; i i nun; i i mm; E+1 1E+2 1E+3 1E44 1E+5 1E+6 1E+7 Time (day) Figure 6: Temporal pore pressure.
7 Computer Methods in Water Resources IV 241 permeabilities. With similar subsidence profiles at initial stage, the differences are observed only during the late period. Then it is noted that the subsidence slope changes occur when the fracture and matrix permeabilities are smaller. These slope changes resemble the pressure gradient changes reported by Warren and Root* in their dual-porosity model, a consequence of the interporosity flow between these two interacting media. Similar observation can be made to the normalized pressure distributions, as shown in Figure 8. For smaller fracture and matrix permeabilities, Mandel effect appears to be more apparent, and pressure slope changes are more radical, indicating larger interporosity flow. Because the porosity is in general proportional to the permeability for the porous media, the less porous strata appears also to lead to the delayed subsidence i I J I '"'""I M"ini{ iihmi * M.IIII iiinm] i iiiini MIIIIII IMIIIII iiiimi E+1 1E+2 1E+3 1E+4 1E+5 1E+6 1E+7 1E+8 Time (day) Figure 7: Subsidence for various permeabilities. The relationship between the normalized subsidence and the fracture spacing at various times is depicted in Figure 9. In general, the smaller the spacing is, the greater the subsidence will be, especially at earlier times. A smaller fracture spacing implies a more densely fractured medium, where larger fracture compressibility results in greater displacement. The influence of fluid flow on the magnitude of surface subsidence can be assessed by the evaluation of Biot's coefficient af which is proportional to pore pressure contribution over the change of rock displacement. Figure 10 indicates that the maximum subsidence will result when a reach one. a
8 Normalized subsidence I _J I L_ Normalized pore pressin s o s- O CO I cr
9 Computer Methods in Water Resources IV 243 is a function of bulk modulus of rock masses as well as that of solid grains. For sedimentary rocks, a usually is within the range of 0.5 to 0.9. Legend Alpha = Alpha = 0.1 Alpha = 03 Alpha =1.0 (Alpha = Boifs coefficient) 400 Distance from centedine (m) 800 Figure 10: Subsidence for various Biot's coefficients. 4 Concluding remarks The results of numerical analysis presented in the previous can be summarized as follows: (a) The transient dual porosity model shows a strong coupling between strata deformation and fluid flow. The changes in the regional pore pressure mainly occur in the vicinity of the mining panel where excessive strains due to mining are expected. (b) The dual-porosity models analyzed may generate larger displacements in comparison with the single-porosity models. This may correspond, in large part, to the inherent compliance of the dual-porosity medium as a result of fracture compressibility. (c) It is found from this study that the induced surface subsidence may be maximized if: (a) long time has elapsed since the mining is over; (b) pore pressure completely dissipates; (c) mechanical properties of overburden and gob are the softest, (d) fracture spacing of the overburden is the smallest, (e) Biot's coefficient becomes one, and (f) fracture and matrix permeabilities are the largest. The maximum possible surface subsidence would result if all the above features are combined.
10 244 Computer Methods in Water Resources IV (d) The most important finding of this research is perhaps attributed to the identification of the influence of fluid flow on the surface subsidence. This impact can become so significant that mining induced surface subsidence might be overshadowed. As a result, where mining under the aquifers and the groundwater is diverted either into the mining panel or to other places, it is crucial to be able to assess the subsidence magnitude through separate calculations of the contribution from the fluid flow and from the underground mining. Under such conditions, the maximum surface subsidence may not be proportional to the thickness of the extracted seam alone, and the subsidence due to fluid drainage must be taken into account. In most cases, the subsidence will be larger under this coupled phenomenon than that subjected to mining only. Acknowledgments Support of the National Science Foundation/State/Industry under the S/IUCRC program and under the contract EEC , and support of China Coal Research Institute under the collaborative contract, are gratefully acknowledged. References 1. Els worth, D. and Bai, M., Flow-deformation response of dual-porosity media, Journal of Geotechnical Engineering, ASCE, 1992, Bai, M., Els worth, D. and Roegiers, J-C., Modeling of naturally fractured reservoirs using deformation dependent flow mechanism, Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., 1993, Mandel, J., Consolidation des sols, Geotechnique, 1953, 3, Warren, J.E. and Root, P.J., The behavior of naturally fractured reservoirs, 5oc. PeZ. E%#. J., 1963, 3, Biot, M.A., General theory of three dimensional consolidation, J. s., 12, 1941,
11 Computer Methods in Water Resources IV 245 Parameter E V I<n Kf HI %2 k\ln ^2//^ 5 Table 1 Selected parameters in modeling Definition elasticity modulus Poisson's ratio fracture stiffness fluid bulk modulus matrix porosity fracture porosity matrix permeability fracture permeability fracture spacing Magnitude 10* 0.2 2xlO< 10* * Unit MN/nf MN/m^/m MN/nf rn*/(mn s) m</(mn s) m
3D simulations of an injection test done into an unsaturated porous and fractured limestone
3D simulations of an injection test done into an unsaturated porous and fractured limestone A. Thoraval *, Y. Guglielmi, F. Cappa INERIS, Ecole des Mines de Nancy, FRANCE *Corresponding author: Ecole des
More informationMultiphysics modelling of the Mandel-Cryer effect
Int. Jnl. of Multiphysics Volume 10 Number 1 2016 11 Multiphysics modelling of the Mandel-Cryer effect E Holzbecher* German University of Technology in Oman (GUtech) Muscat, Oman ABSTRACT In porous medium
More information6298 Stress induced azimuthally anisotropic reservoir - AVO modeling
6298 Stress induced azimuthally anisotropic reservoir - AVO modeling M. Brajanovski* (Curtin University of Technology), B. Gurevich (Curtin University of Technology), D. Nadri (CSIRO) & M. Urosevic (Curtin
More informationD scattering of obliquely incident Rayleigh waves by a saturated alluvial valley in a layered half-space
1842. 3-D scattering of obliquely incident Rayleigh waves by a saturated alluvial valley in a layered half-space Zhenning Ba 1, Jianwen Liang 2 Department of Civil Engineering, Tianjin University, Tianjin
More informationCoupled stress and permeability behavior in fractured media and its application
Pacific Rocks 2000, Girard, Liebman, Breeds 8 Doe (eds)o 2000 Balkema, Rotterdam, ISBN 90 5809 155 4 Coupled stress and permeability behavior in fractured media and its application Jincai Zhang School
More informationANALYTICAL EVALUATION OF POST-EXCAVATION HYDRAULIC CONDUCTIVITY FIELD AROUND A TUNNEL
Int. J. Rock Mech. & Min. Sci. Vol. 34, No. 3-4, 1997 To cite this paper: Int. J. RockMech. &Min. Sci. 34:3-4, Paper No. 181 ANALYTICAL EVALUATION OF POST-EXCAVATION HYDRAULIC CONDUCTIVITY FIELD AROUND
More informationMonitoring of underground construction
Monitoring of underground construction Geotechnical Aspects of Underground Construction in Soft Ground Yoo, Park, Kim & Ban (Eds) 2014 Korean Geotechnical Society, Seoul, Korea, ISBN 978-1-138-02700-8
More informationFracture-Matrix Flow Partitioning and Cross Flow: Numerical Modeling of Laboratory Fractured Core Flood
Fracture-Matrix Flow Partitioning and Cross Flow: Numerical Modeling of Laboratory Fractured Core Flood R. Sanaee *, G. F. Oluyemi, M. Hossain, and M. B. Oyeneyin Robert Gordon University *Corresponding
More informationLongwall Caving in Potash Mining Geomechanical Assessment of Damage and Barrier Integrity
Longwall Caving in Potash Mining Geomechanical Assessment of Damage and Barrier Integrity Wolfgang Minkley, Christoph Lüdeling Institut für Gebirgsmechanik, Leipzig 50th ARMA Symposium, Houston 29 June
More informationHaulage Drift Stability Analysis- A Sensitivity Approach
Haulage Drift Stability Analysis- A Sensitivity Approach W. Abdellah University of Assiut, Assiut, Egypt ABSTRACT Haulage drifts are the primary access to the mining blocks of an ore body in a multi-level
More informationCompressibility & Consolidation
CHAPTER Compressibility & Consolidation Settlement If a structure is placed on soil surface, then the soil will undergo an elastic and plastic deformation. In engineering practice, the deformation or reduction
More informationTikrit University. College of Engineering Civil engineering Department CONSOILDATION. Soil Mechanics. 3 rd Class Lecture notes Up Copyrights 2016
Tikrit University CONSOILDATION College of Engineering Civil engineering Department Soil Mechanics 3 rd Class Lecture notes Up Copyrights 2016 Stresses at a point in a soil mass are divided into two main
More informationUnjacketed bulk compressibility of sandstone in laboratory experiments. R. M. Makhnenko 1 and J. F. Labuz 1
481 Unjacketed bulk compressibility of sandstone in laboratory experiments R. M. Makhnenko 1 and J. F. Labuz 1 1 Department of Civil Engineering, University of Minnesota, Minneapolis, MN 55455; PH (612)
More informationInternational Journal of Greenhouse Gas Control
International Journal of Greenhouse Gas Control 4 (2010) 668 678 Contents lists available at ScienceDirect International Journal of Greenhouse Gas Control journal homepage: www.elsevier.com/locate/ijggc
More informationTIME-DEPENDENT BEHAVIOR OF PILE UNDER LATERAL LOAD USING THE BOUNDING SURFACE MODEL
TIME-DEPENDENT BEHAVIOR OF PILE UNDER LATERAL LOAD USING THE BOUNDING SURFACE MODEL Qassun S. Mohammed Shafiqu and Maarib M. Ahmed Al-Sammaraey Department of Civil Engineering, Nahrain University, Iraq
More informationResearch on Coal Pillar Width in Roadway Driving Along Goaf Based on The Stability of Key Block
Copyright 2015 Tech Science Press CMC, vol.48, no.2, pp.77-90, 2015 Research on Coal Pillar Width in Roadway Driving Along Goaf Based on The Stability of Key Block Zhengzheng Cao 1, Yuejin Zhou 1,2 Abstract:
More informationTime Rate of Consolidation Settlement
Time Rate of Consolidation Settlement We know how to evaluate total settlement of primary consolidation S c which will take place in a certain clay layer. However this settlement usually takes place over
More informationA Constitutive Framework for the Numerical Analysis of Organic Soils and Directionally Dependent Materials
Dublin, October 2010 A Constitutive Framework for the Numerical Analysis of Organic Soils and Directionally Dependent Materials FracMan Technology Group Dr Mark Cottrell Presentation Outline Some Physical
More informationA PRESSURE VESSEL FOR TRUE-TRIAXIAL DEFORMATION & FLUID FLOW DURING FRICTIONAL SHEAR
A PRESSURE VESSEL FOR TRUE-TRIAXIAL DEFORMATION & FLUID FLOW DURING FRICTIONAL SHEAR Chris Marone, Brett Carperter, Derek Elsworth, Igor Faoro, Matt Ikari, Matt Knuth, André Niemeijer, Demian Saffer, and
More information25th International Conference on Ground Control in Mining
ANALYTICAL INVESTIGATION OF SHAFT DAMAGES AT WEST ELK MINE Tim Ross, Senior Associate Agapito Associates, Inc. Golden, CO, USA Bo Yu, Senior Engineer Agapito Associates, Inc. Grand Junction, CO, USA Chris
More informationA NOVEL FULLY COUPLED GEOMECHANICAL MODEL FOR CO 2 SEQUESTRATION IN FRACTURED AND POROUS BRINE AQUIFERS
XIX International Conference on Water Resources CMWR 2012 University of Illinois at Urbana-Champagne June 17-22, 2012 A NOVEL FULLY COUPLED GEOMECHANICAL MODEL FOR CO 2 SEQUESTRATION IN FRACTURED AND POROUS
More informationFlow-Deformation Response of Dual-Porosity Media
Flow-Deformation Response of Dual-Porosity Media By Derek Elsworth, 1 Member, ASCE, and Mao Bai 2 Downloaded from ascelibrary.org by Pennsylvania State University on 03/25/16. Copyright ASCE. For personal
More informationModeling seismic wave propagation during fluid injection in a fractured network: Effects of pore fluid pressure on time-lapse seismic signatures
Modeling seismic wave propagation during fluid injection in a fractured network: Effects of pore fluid pressure on time-lapse seismic signatures ENRU LIU, SERAFEIM VLASTOS, and XIANG-YANG LI, Edinburgh
More informationAnalytical and Numerical Investigations on the Vertical Seismic Site Response
Analytical and Numerical Investigations on the Vertical Seismic Site Response Bo Han, Lidija Zdravković, Stavroula Kontoe Department of Civil and Environmental Engineering, Imperial College, London SW7
More informationMethods of Interpreting Ground Stress Based on Underground Stress Measurements and Numerical Modelling
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2006 Methods of Interpreting Ground Stress Based on Underground Stress Measurements and
More informationNumerical Simulation of Unsaturated Infilled Joints in Shear
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2018 Numerical Simulation of Unsaturated Infilled Joints in Shear Libin Gong University
More informationA BOOKLET ON. T Rangasamy, A R Leach and A P Cook. Facilitating safety and health research in the South African mining industry
A BOOKLET ON THE HYDRAULIC DESIGN OF COAL BARRIER PILLARS T Rangasamy, A R Leach and A P Cook Facilitating safety and health research in the South African mining industry A BOOKLET ON THE HYDRAULIC DESIGN
More informationRock Mechanics Laboratory Tests for Petroleum Applications. Rob Marsden Reservoir Geomechanics Advisor Gatwick
Rock Mechanics Laboratory Tests for Petroleum Applications Rob Marsden Reservoir Geomechanics Advisor Gatwick Summary A wide range of well established and proven laboratory tests are available for petroleum
More informationNumerical Analysis on Shaft Lining Stability during Aquifer Quick Drainage in Eastern Chinese Coal Mines
Numerical Analysis on Shaft Lining Stability during Aquifer Quick Drainage in Eastern Chinese Coal Mines Qing YU (1), Jinrong MA (2) and Jiaxing LIN (3) (1) School of Resources and Geosciences, China University
More informationThe Effect of Stress Arching on the Permeability Sensitive Experiment in the Su Lige Gas Field
The Effect of Stress Arching on the Permeability Sensitive Experiment in the Su Lige Gas Field Fanliao Wang, Xiangfang Li, Gary Couples, Mingchuan Wang, Yiqun Zhang and Jingjing Zhao THE EFFECT OF STRESS
More informationFrequency-Dependent Amplification of Unsaturated Surface Soil Layer
Frequency-Dependent Amplification of Unsaturated Surface Soil Layer J. Yang, M.ASCE 1 Abstract: This paper presents a study of the amplification of SV waves obliquely incident on a surface soil layer overlying
More informationCoalbed Methane Properties
Coalbed Methane Properties Subtopics: Permeability-Pressure Relationship Coal Compressibility Matrix Shrinkage Seidle and Huitt Palmer and Mansoori Shi and Durucan Constant Exponent Permeability Incline
More informationSaturation Effects of Soils on Ground Motion at Free Surface Due to Incident SV Waves
Saturation Effects of Soils on Ground Motion at Free Surface Due to Incident SV Waves Jun Yang, M.ASCE 1 Abstract: A study is presented of saturation effects of subsoil on seismic motions at the free surface
More informationThe process of consolidation and settlement
Consolidation Based on part of the GeotechniCAL reference package by Prof. John Atkinson, City University, London The process of consolidation and settlement One-dimensional consolidation theory The oedometer
More informationCalculation types: drained, undrained and fully coupled material behavior. Dr Francesca Ceccato
Calculation types: drained, undrained and fully coupled material behavior Dr Francesca Ceccato Summary Introduction Applications: Piezocone penetration (CPTU) Submerged slope Conclusions Introduction Porous
More informationSimplify the Structure of The Surface Mining and Analytic Calculation
Research Paper Simplify the Structure of The Surface Mining and Analytic Calculation Zhang Mei 1, Meng Da 2 1.Agricultural University of Hebei, College of Urban and Rural Construction, Baoding, 071000,
More informationInstructor : Dr. Jehad Hamad. Chapter (7)
Instructor : Dr. Jehad Hamad Chapter (7) 2017-2016 Soil Properties Physical Properties Mechanical Properties Gradation and Structure Compressibility Soil-Water Relationships Shear Strength Bearing Capacity
More informationGEO-SLOPE International Ltd, Calgary, Alberta, Canada Wick Drain
1 Introduction Wick Drain This example is about modeling the behavior of a wick drain. The primary purpose here is to illustrate how interface elements can conveniently be used to include the effects of
More informationModelling of pumping from heterogeneous unsaturated-saturated porous media M. Mavroulidou & R.I. Woods
Modelling of pumping from heterogeneous unsaturated-saturated porous media M. Mavroulidou & R.I. Woods Email: M.Mavroulidou@surrey.ac.uk; R. Woods@surrey.ac.uk Abstract Practising civil engineers often
More informationSEISMIC RESPONSE OF A SANDY STRATUM WITH A SILT LAYER UNDER STRONG GROUND MOTIONS
SEISMIC RESPONSE OF A SANDY STRATUM WITH A SILT LAYER UNDER STRONG GROUND MOTIONS Bakhtiar Cahyandi Ridla 1), Huei-Tsyr Chen 2), M. Ruslin Anwar 3) 1) Double Degree Program E-mail: bakhtiar.ridla@gmail.com
More information16. Mining-induced surface subsidence
16. Mining-induced surface subsidence 16.1 Types and effects of mining-induced subsidence Subsidence - Lowering of the ground surface following underground extraction of an orebody. - Types: continuous
More informationInfluences of material dilatancy and pore water pressure on stability factor of shallow tunnels
Influences of material dilatancy and pore water pressure on stability factor of shallow tunnels YANG Xiao-li( ), HUANG Fu( ) School of Civil and Architectural Engineering, Central South University, Changsha
More informationNumerical modelling for estimation of first weighting distance in longwall coal mining - A case study
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2012 Numerical modelling for estimation of first weighting distance in longwall coal
More informationExperimental research on overlying strata movement and fracture evolution in pillarless stress-relief mining
Int J Coal Sci Technol (2015) 2(1):38 45 DOI 10.1007/s40789-015-0067-0 Experimental research on overlying strata movement and fracture evolution in pillarless stress-relief mining Junhua Xue 1 Hanpeng
More informationReservoir Simulator Compaction Modelling: A Predictor for Accelerated Coupled Rock Mechanics -- Reservoir Simulation
Reservoir Simulator Compaction Modelling: A Predictor for Accelerated Coupled Rock Mechanics -- Reservoir Simulation by Øystein Pettersen Centre for Integrated Petroleum Research, Bergen, Norway ECMOR
More informationMcMAT 2007 Micromechanics of Materials Austin, Texas, June 3 7, 2007
McMAT 2007 Micromechanics of Materials Austin, Texas, June 3 7, 2007 RANDOM POLYCRYSTALS OF GRAINS WITH CRACKS: MODEL OF ELASTIC BEHAVIOR FOR FRACTURED SYSTEMS James G. Berryman Earth Sciences Division
More informationConsolidation of a poroelastic half-space with anisotropic permeability and compressible constituents by axisymmetric surface loading
Consolidation of a poroelastic half-space with anisotropic permeability and compressible constituents by axisymmetric surface loading Sarva Jit Singh 1,, Raman Kumar and Sunita Rani, 1 Department of Mathematics,
More information1.8 Unconfined Compression Test
1-49 1.8 Unconfined Compression Test - It gives a quick and simple measurement of the undrained strength of cohesive, undisturbed soil specimens. 1) Testing method i) Trimming a sample. Length-diameter
More informationReservoir Geomechanics with ABAQUS
Reservoir Geomechanics with ABAQUS B. Bostrøm and E. Skomedal Statoil ASA, Norway Abstract: The coupled hydro-mechanical behavior of two North Sea high-pressure/hightemperature gas-condensate fields during
More informationUpscaling mechanical rock properties and pore fluid pressure: An application to geomechanical modelling
Upscaling mechanical rock properties and pore fluid pressure: An application to geomechanical modelling Peter Schutjens and Jeroen Snippe Shell U.K. Exploration & Production Aberdeen DEVEX 2009, Aberdeen
More informationUnderstanding hydraulic fracture variability through a penny shaped crack model for pre-rupture faults
Penny shaped crack model for pre-rupture faults Understanding hydraulic fracture variability through a penny shaped crack model for pre-rupture faults David Cho, Gary F. Margrave, Shawn Maxwell and Mark
More informationON THE FACE STABILITY OF TUNNELS IN WEAK ROCKS
33 rd 33 Annual rd Annual General General Conference conference of the Canadian of the Canadian Society for Society Civil Engineering for Civil Engineering 33 e Congrès général annuel de la Société canadienne
More informationEFFECTS OF GROUND WATER ON SEISMIC RESPONSES OF BASIN
EFFECTS OF GROUND WATER ON SEISMIC RESPONSES OF BASIN Huei-Tsyr CHEN And Jern-Chern HO 2 SUMMARY It has long been recognized that the local soil and geology conditions may affect significantly the nature
More informationLandslide FE Stability Analysis
Landslide FE Stability Analysis L. Kellezi Dept. of Geotechnical Engineering, GEO-Danish Geotechnical Institute, Denmark S. Allkja Altea & Geostudio 2000, Albania P. B. Hansen Dept. of Geotechnical Engineering,
More informationEffect of buttress on reduction of rock slope sliding along geological boundary
Paper No. 20 ISMS 2016 Effect of buttress on reduction of rock slope sliding along geological boundary Ryota MORIYA *, Daisuke FUKUDA, Jun-ichi KODAMA, Yoshiaki FUJII Faculty of Engineering, Hokkaido University,
More informationSeismic analysis of horseshoe tunnels under dynamic loads due to earthquakes
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2010 Seismic analysis of horseshoe tunnels under dynamic loads due to earthquakes Navid
More informationChapter 14. Groundwater
Chapter 14 Groundwater Importance of groundwater! Groundwater is water found in the pores of soil and sediment, plus narrow fractures in bedrock! Groundwater is the largest reservoir of fresh water that
More informationTemperature Dependent Mechanical Properties of Reservoir s Overburden Rocks During SAGD Process
Temperature Dependent Mechanical Properties of Reservoir s Overburden Rocks During SAGD Process Bo Zhao 1, Shangqi Liu 2, Bo Huang 3, and Yang Liu 4 and Guangqing Zhang *,5 1,5 China University of Petroleum
More informationSENSITIVITY ANALYSIS OF AMPLITUDE VARIATION WITH OFFSET (AVO) IN FRACTURED MEDIA
SENSITIVITY ANALYSIS OF AMPLITUDE VARIATION WITH OFFSET AVO) IN FRACTURED MEDIA Mary L. Krasovec, William L. Rodi, and M. Nafi Toksoz Earth Resources Laboratory Department of Earth, Atmospheric, and Planetary
More informationChapter 3 LAMINATED MODEL DERIVATION
17 Chapter 3 LAMINATED MODEL DERIVATION 3.1 Fundamental Poisson Equation The simplest version of the frictionless laminated model was originally introduced in 1961 by Salamon, and more recently explored
More informationConsolidation settlements above deep tunnels in fractured crystalline rock: Part 2 Numerical analysis of the Gotthard highway tunnel case study
International Journal of Rock Mechanics & Mining Sciences 45 (2008) 1211 1225 www.elsevier.com/locate/ijrmms Consolidation settlements above deep tunnels in fractured crystalline rock: Part 2 Numerical
More information16 Rainfall on a Slope
Rainfall on a Slope 16-1 16 Rainfall on a Slope 16.1 Problem Statement In this example, the stability of a generic slope is analyzed for two successive rainfall events of increasing intensity and decreasing
More informationA Numerical Study on the Effect of Anisotropy on Hydraulic Fractures
Rock Mechanics and Rock Engineering (219) 52:591 69 https://doi.org/1.17/s63-17-1362-4 ORIGINAL PAPER V. Valliappan 1 J. J. C. Remmers 1 A. Barnhoorn 2 D. M. J. Smeulders 1 Received: 3 April 217 / Accepted:
More informationAADE-03-NTCE-11. Copyright 2003 AADE Technical Conference
AADE-03-NTCE-11 Modeling Real-Time Wellbore Stability within the Theory of Poromechanics Younane Abousleiman, Rajesh Nair and Vinh Nguyen PoroMechanics Institute, PMI, the University of Oklahoma, USA.
More informationHydromechanical modelling of pulse tests that measure fluid pressure and fracture normal displacement at the Coaraze Laboratory site, France
Author manuscript, published in "International Journal of Rock Mechanics & Mining Sciences 43 (2005) (2006) 1062 1082" Hydromechanical modelling of pulse tests that measure fluid pressure and fracture
More informationAnalysis of Fracture Propagation under Thermal Stress in Geothermal Reservoirs
Proceedings World Geothermal Congress 2015 Melbourne, Australia, 19-25 April 2015 Analysis of Fracture Propagation under Thermal Stress in Geothermal Reservoirs Ahmad Ghassemi, Sergej Tarasovs Mailing
More informationStudy of borehole stability of Marcellus shale wells in longwall mining areas
J Petrol Explor Prod Technol (2014) 4:59 71 DOI 10.1007/s13202-013-0083-9 ORIGINAL PAPER - PRODUCTION ENGINEERING Study of borehole stability of Marcellus shale wells in longwall mining areas Yi Wang Robert
More informationModelling Progressive Failure with MPM
Modelling Progressive Failure with MPM A. Yerro, E. Alonso & N. Pinyol Department of Geotechnical Engineering and Geosciences, UPC, Barcelona, Spain ABSTRACT: In this work, the progressive failure phenomenon
More informationThe Interaction of Reservoir Engineering and Geomechanics (a story)
The Interaction of Reservoir Engineering and Geomechanics (a story) Brian G D Smart FREng, FRSE, FIMMM, CEng Petromall Ltd Why is the interaction a good thing? Assertion - Reservoir Geomechanics enables
More informationChapter 1 INTRODUCTION
CONSTITUTIVE MODELS AND CHALK Chapter 1 INTRODUCTION Computing power has advanced significantly in the years since soil mechanics and rock mechanics first became mature fields. Probably the single most
More informationNumerical simulation of inclined piles in liquefiable soils
Proc. 20 th NZGS Geotechnical Symposium. Eds. GJ Alexander & CY Chin, Napier Y Wang & R P Orense Department of Civil and Environmental Engineering, University of Auckland, NZ. ywan833@aucklanduni.ac.nz
More informationAbstract. 1 Introduction
Efficiency of absorbing boundary conditions forfluid-saturatedporous media T. Akiyoshi, K. Fuchida, H.L. Fang Department of Civil and Environmental Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto
More information*** ***! " " ) * % )!( & ' % # $. 0 1 %./ +, - 7 : %8% 9 ) 7 / ( * 7 : %8% 9 < ;14. " > /' ;-,=. / ١
١ ******!" #$ % & '!( ) % * ") +,-./ % 01. 3 ( 4 56 7/4 ) 8%9 % : 7 ;14 < 8%9 % : *7./ = ;-, >/'." Soil Permeability & Seepage ٢ Soil Permeability- Definition ٣ What is Permeability? Permeability is the
More informationPrediction of subsoil subsidence caused by opencast mining
Land Subsidence (Proceedings of the Fifth International Symposium on Land Subsidence, The Hague, October 1995). IAHS Publ. no. 234, 1995. 167 Prediction of subsoil subsidence caused by opencast mining
More informationStudy on Numerical Simulation of Steam Huff and Puff Based on Deformable Medium Model
SCIREA Journal of Mine Engineering http://www.scirea.org/journal/mine October 1, 2016 Volume 1, Issue1, October 2016 Study on Numerical Simulation of Steam Huff and Puff Based on Deformable Medium Model
More informationCHAPTER 8 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS
CHAPTER 8 SUMMARY, CONCLUSIONS AND RECOMMENDATIONS 8.1 SUMMARY This thesis aimed to investigate the mechanisms behind valley closure and upsidence over unmined coal and old longwall panels using UDEC.
More informationThe evolution of the reservoir stress state throughout the history of production
International Journal of Petroleum and Geoscience Engineering (IJPGE) 2 (2): 181- ISSN 2289-4713 Academic Research Online Publisher Research paper The evolution of the reservoir stress state throughout
More informationTable of Contents Chapter 1 Introduction to Geotechnical Engineering 1.1 Geotechnical Engineering 1.2 The Unique Nature of Soil and Rock Materials
Table of Contents Chapter 1 Introduction to Geotechnical Engineering 1.1 Geotechnical Engineering 1.2 The Unique Nature of Soil and Rock Materials 1.3 Scope of This Book 1.4 Historical Development of Geotechnical
More informationSand Control Rock Failure
Sand Control Rock Failure Why? A bit of Mechanics on rock failure How? Some choices that depend on the rock What is moving? Sand grains? Fines? 3/14/2009 1 Young s Modulus, E Young s Modulus is a material
More informationDeveloping rules of thumb for groundwater modelling in large open pit mine design
Developing rules of thumb for groundwater modelling in large open pit mine design Jim Hazzard, Branko Damjanac, Christine Detournay & Loren Lorig Itasca Consulting Group, Minneapolis, MN, USA ABSTRACT
More informationEffects of Fracture Parameters in an Anisotropy Model on P-Wave Azimuthal Amplitude Responses
PROC. ITB Eng. Science Vol. 38 B, No. 2, 2006, 159-170 159 Effects of Fracture Parameters in an Anisotropy Model on P-Wave Azimuthal Amplitude Responses Fatkhan Program Studi Teknik Geofisika FIKTM-ITB
More informationExperimental Research on Ground Deformation of Double Close-spaced Tunnel Construction
Research Journal of Applied Sciences, Engineering and Technology 4(22): 484-4844, 212 ISSN: 24-7467 Maxwell Scientific Organization, 212 Submitted: May 8, 212 Accepted: June 8, 212 Published: November
More informationEssentials of Geology, 11e
Essentials of Geology, 11e Groundwater Chapter 10 Instructor Jennifer Barson Spokane Falls Community College Geology 101 Stanley Hatfield Southwestern Illinois Co Jennifer Cole Northeastern University
More informationMining-Caused Activation of Fault
Discrete Dynamics in Nature and Society, 2002 VoL. 7 (3), pp. 151-155 Taylor & Francis Taylor & Francis Group Numerical Simulation of Fractal Interface Effect of Mining-Caused Activation of Fault YU GUANGMINGa
More informationSETTLEMENT TROUGH DUE TO TUNNELING IN COHESIVE GROUND
Indian Geotechnical Journal, 41(), 11, 64-75 SETTLEMENT TROUGH DUE TO TUNNELING IN COHESIVE GROUND Mohammed Y. Fattah 1, Kais T. Shlash and Nahla M. Salim 3 Key words Tunnel, clay, finite elements, settlement,
More informationExperimental investigation into stress-relief characteristics with upward large height and upward mining under hard thick roof
Int J Coal Sci Technol (2015) 2(1):91 96 DOI 10.1007/s40789-015-0066-1 Experimental investigation into stress-relief characteristics with upward large height and upward mining under hard thick roof Ke
More informationScoping Calculations of TBM Advancement in Flysch and Breccias of Strait-of-Gibraltar Tunnel
EURO:TUN 2009 2 nd International Conference on Computational Methods in Tunnelling Ruhr University Bochum, 9-11 September 2009 Aedificatio Publishers, 369-376 Scoping Calculations of TBM Advancement in
More informationCompression and swelling. Mechanisms of compression. Mechanisms Common cases Isotropic One-dimensional Wet and dry states
Compression and swelling Mechanisms Common cases Isotropic One-dimensional Wet and dry states The relationship between volume change and effective stress is called compression and swelling. (Consolidation
More informationTitle. Author(s)Akm Badrul, Alam; Fujii, Yoshiaki; Aramaki, Noritaka. CitationProceedings of Japan Symposium on Rock Mechanics, 14
Title Water migration into underground cavern considering Author(s)Akm Badrul, Alam; Fujii, Yoshiaki; Aramaki, Noritaka CitationProceedings of Japan Symposium on Rock Mechanics, 4 Issue Date 207-0-0 Doc
More informationConsolidation. Verification Manual GT. Written by: The SoilVision Systems Ltd. Team. Last Updated: Saturday, October 13, 2018
Consolidation Verification Manual GT Written by: The SoilVision Systems Ltd. Team Last Updated: Saturday, October 13, 2018 SoilVision Systems Ltd. Saskatoon, Saskatchewan, Canada Software License The software
More informationIN-SITU STRESS ESTIMATION IN OFFSHORE EASTERN MEDITERRANEAN WITH FINITE ELEMENT ANALYSIS
8 th GRACM International Congress on Computational Mechanics Volos, 12 July 15 July 2015 IN-SITU STRESS ESTIMATION IN OFFSHORE EASTERN MEDITERRANEAN WITH FINITE ELEMENT ANALYSIS Anna Kyriacou 1, Panos
More information3D ANALYSIS OF H-M COUPLED PROBLEM WITH ZERO-THICKNESS INTERFACE ELEMENTS APPLIED TO GEOMECHANICS
Environmental 3D analysis of H-M and Geosciences coupled problem with zero-thickness interface elements applied to Geomechanics XIII International Conference on Computational Plasticity. Fundamentals and
More informationCONSOLIDATION BEHAVIOR OF PILES UNDER PURE LATERAL LOADINGS
VOL., NO., DECEMBER 8 ISSN 89-8 -8 Asian Research Publishing Network (ARPN). All rights reserved. CONSOLIDATION BEAVIOR OF PILES UNDER PURE LATERAL LOADINGS Qassun S. Mohammed Shafiqu Department of Civil
More informationEXAMINING THE BEHAVIORS OF SANDY AND SILTY SEABED UNDER WAVE ACTIONS
682 Journal of Marine Science and Technology, Vol. 24, No.4, pp. 682-689 (2016) DOI: 10.6119/JMST-015-1231-1 EXAMINING THE BEHAVIORS OF SANDY AND SILTY SEABED UNDER WAVE ACTIONS Yuchen Wang 1, *, Erwin
More informationIGJ PROOFS SETTLEMENT TROUGH DUE TO TUNNELING IN COHESIVE GROUND. Surface Settlement. Introduction. Indian Geotechnical Journal, 41(2), 2011, 64-75
Indian Geotechnical Journal, 41(), 11, 64-75 SETTLEMENT TROUGH DUE TO TUNNELING IN COHESIVE GROUND Key words Tunnel, clay, finite elements, settlement, complex variable Introduction The construction of
More informationNonlinear Time-Dependent Soil Behavior due to Construction of Buried Structures
Journal of Earth Sciences and Geotechnical Engineering, vol. 4, no. 1, 214, 71-88 ISSN: 172-4 (print), 172- (online) Scienpress Ltd, 214 Nonlinear Time-Dependent Soil Behavior due to Construction of Buried
More information3-D Numerical simulation of shake-table tests on piles subjected to lateral spreading
3-D Numerical simulation of shake-table tests on piles subjected to lateral spreading M. Cubrinovski 1, H. Sugita 2, K. Tokimatsu 3, M. Sato 4, K. Ishihara 5, Y. Tsukamoto 5, T. Kamata 5 1 Department of
More informationEstimating Permeability from Acoustic Velocity and Formation Resistivity Factor
5th Conference & Exposition on Petroleum Geophysics, Hyderabad-2004, India PP 582-587 and Formation Resistivity Factor Majid Nabi-Bidhendi Institute of Geophysics, University of Tehran, P.O. Box 14155-6466,
More informationP16 Gravity Effects of Deformation Zones Induced by Tunnelling in Soft and Stiff Clays
P16 Gravity Effects of Deformation Zones Induced by Tunnelling in Soft and Stiff Clays V. Blecha* (Charles University) & D. Mašín (Charles University) SUMMARY We calculated gravity response of geotechnical
More informationThis paper was prepared for presentation at the Unconventional Resources Technology Conference held in Denver, Colorado, USA, August 2013.
1 SPE 168873 / URTeC 1606914 Numerical Upcaling of Coupled Flow and Geomechanics in Highly Heterogeneous Porous Media Daegil Yang, Texas A&M University; George J. Moridis, Lawrence Berkeley National Laboratory;
More information