In-situ Experiments on Excavation Disturbance in JNC s Geoscientific Research Programme
|
|
- Teresa Neal
- 6 years ago
- Views:
Transcription
1 In-situ Experiments on Excavation Disturbance in JNC s Geoscientific Research Programme H. Matsui, K. Sugihara and T. Sato Japan Nuclear Cycle Development Institute, Japan Summary The HLW disposal program in Japan is currently in the implementation phase. In order to contribute to the formation of a firm scientific basis for the R&D activities, the JNC is conducting an extensive geoscientific research program. As a part of the rock mechanics research in this program, in-situ experiments on excavation disturbance have been performed at the Tono Mine for soft sedimentary rocks and at the Kamaishi Mine for hard crystalline rocks, both of which are common in Japan. These experiments have revealed the development of excavation disturbed zones (EDZs) at the study sites. It is suggested that mechanical excavation and controlled excavation have reduced excavation damage in the rock mass around drifts, although some improvements in the currently available methods for measuring and simulating the EDZ are essential to understand excavation disturbance in more detail. Figure 1. Location map of the Tono Mine and the Kamaishi Mine, including the Underground Research Laboratory sites. 1. Introduction In Japan, as outlined in the overall High-level Radioactive Waste (HLW) Management Program defined by the Atomic Energy Commission of Japan (AEC,1994), the HLW separated from spent nuclear fuel at reprocessing plants will be immobilized in a glass matrix and stored for a period of 30 to 50 years to allow cooling. It will then be disposed of in a deep geological formation (geological disposal). Pursuant to the overall HLW management program, Nuclear Waste Management Organization of Japan (NUMO), the organization with responsibility for implementing HLW disposal, was established in However, as some important R&D issues still remain, Japan Nuclear Cycle Development Institute (JNC) has been assigned the role as the leading organization responsible for R&D activities. The JNC is now promoting two projects to build underground research facilities in Japan. One is the Mizunami Underground Research Laboratory (MIU) project for granitic rocks and the other is the project in Horonobe for sedimentary rock (Fig.1).
2 2. Conceptual model of EDZ We define the EDZ as the rock zone adjacent to a drift where rock properties and conditions have changed due to the processes induced by excavation, such as fracturing, stress redistribution and desaturation (Fig.2). Rock properties, such as deformability, seismic velocity and permeability around underground openings, are expected to change due to these phenomena. The excavation damage (fracturing) is considered to be dependent on the excavation method. The EDZ is considered to be physically less stable and could form a continuous and high-permeable pathway for groundwater flow, so the EDZ has the potential of affecting the safety of the underground openings and repository performance. Figure 2. Conceptual model of the EDZ. Based on the conceptual model of EDZ formation, the in-situ experiment on EDZ in Tono and Kamaishi Mines were planned and carried out. 3. In-situ experiment on EDZ in Kamaishi Mine 3.1 Site description and experimental setting The geology in the area consists of Paleozoic and Cretaceous sedimentary rocks and two igneous complexes, Kurihashi granodiorite and Ganidake granodiorite (Fig.3). The in-situ experiments on EDZ were carried out at the northern end of the EL.250m level drift about 730m below the ground surface. The average elastic modulus and uniaxial compressive strength are 58.2GPa and 144.4MPa, respectively. The direction of maximum principal stress was almost N-S and horizontal based on stress measurements using overcoring. The average magnitudes of maximum, intermediate and minimum principal stresses were 43.8, 26.8 and 17.8 MPa, respectively. Three fracture sets, oriented N25E80NW, N85E85SW and N20W75NE-75SW occur. The average fracture frequency is about 3.1/m. Figure 4 shows the experimental layout and measurements items at EL. 250m drift. Two new drifts, measurement drift and test drift, were excavated without support. Both normal blasting (NB) and smooth blasting (SB) techniques were Figure 3. Geology of experiment site at the Kamaishi mine. Figure 4. Layout of the drifts and boreholes for Excavation Disturbance Experiment at Kamaishi mine used to assess the influence of different excavation methods on excavation disturbance.
3 3.2 Results and discussion a) Processes related to the changes in rock properties of the EDZ An example of a measured shock wave at blasting is shown in Fig.5. Figure 6 shows the distribution of the acoustic emission (AE) events, together with the computed source mechanisms and energy level. The area of tension cracks induced by blasting is in good agreement with the expected damaged zone created by the blasting induced compressional wave. The shear-wave with the highest amplitude was also measured during vibration measurement and AE events show both tension and shear movements. Figure 5. An example of the measured shock wave at blasting Small rock bursts occurred at the upper, right-hand corners of both drifts of the EL. 250m drift (as seen looking toward the east) during excavation, where numerical modeling work suggested that the stress concentrations should occur and where a notch can be seen in a portion of the roof. These results indicated that rock failure was caused by stress concentration. An ultrasonic tomography survey and velocity measurements made under hydrostatic pressure conditions on core samples suggested fracturing related to stress concentration. Figure 6. Source locations of AE events at blasting In conclusion, the damage due to excavation was mainly induced by P- and S-waves generated by blasting, but a failure zone caused by stress concentration is also indicated.
4 b) The spatial extent of the EDZ and the degree change of rock properties due to excavation Figure.7 shows distributions of the seismic velocities around the test drift by seismic refraction survey. The extent of the low velocity zone, which is about 20-50cm from the drift wall, is very similar for both the SB and NB sections. The average velocities found for the NB section ( 1 st layer: 2.5km/sec, 2 nd layer: 4.0km/sec) are smaller than the velocities for those sections excavated by SB( 1 st layer: 2.6km/sec, 2 nd layer: 4.3 km/sec). Total thickness of the overbreak of drift and low velocity zone agreed well with the thickness estimated by vibration measurements. This means that the thickness of the zone can be predicted if the vibration due to blasting is known. Figure 7. P-wave velocity distribution around test drift The elastic modulus of the low velocity zone detected by the seismic refraction survey was also measured directly with a borehole expansion test. In the zone, the elastic modulus was reduced by a maximum 50% compared to that of host rock. The results of connected permeability tests and hydraulic tests in short sections (10cm) in the low velocity zone of the drift floor show that the measured hydraulic conductivities were about two orders of magnitude higher than in the undamaged part. In the zone of stress redistribution, the measured permeability after excavation of test drift decreased about one order of the magnitude compared to that before excavation. 4. In-situ experiment on EDZ in Tono mine 4.1 Site description and experimental setting The regional geology around the Tono mine consists of Tertiary and Quaternary sedimentary sequences unconformably overlying Cretaceous granitic basement (Figure.8). The in-situ EDZ experiments have been carried out in the northern part of the Figure 8. Schematic figure of geology and mine drift in the Tono mine. horizontal NATM drift, about 135m below the
5 ground surface in the Tertiary sedimentary sequence. The average elastic modulus and uniaxial compressive strength are 2.8GPa and 6.6 MPa, respectively. Figure.9 shows the layout of the in-situ experiment and measurement items for mechanical excavation experiment. Similar layout was also adapted for blasting excavation experiment. New test drifts were excavated using either blasting or mechanical methods to estimate the effects of different excavation methods on excavation disturbance. The test drifts have a horseshoe shaped cross-section and were supported by rock bolts and shotcrete. with a width and a height of 2.4m. Test Drift-2 was excavated by boom header. Before excavation of Test Drift-2 and Test Drift-2M, a 3-m long section of Test-Drift-2M was excavated by drill and blast (Test-Drift 2D) for monitoring vibration induced by blasting. Figure 9. Configuration of drifts and boreholes in mechanical excavation experiment. 4.2 Results and discussion a) Processes related to changes in rock properties within the EDZ Figure.11 shows the model for numerical simulation of the EDZ considered, with properties based on the results of the seismic refraction survey (Fig.10). The widths of the EDZ were assumed to be 0.3m in the case of mechanical excavation, and 0.8m in the case of blasting. The trends of the measured displacements were almost the same as the results of the numerical analysis assuming both with and without an EDZ. In the case of blasting, the calculated displacement without an EDZ is small compared to the measured results (Figure.12). All simulation results suggested that there are no yield zones around the NATM drift. Therefore, an EDZ may be caused by mechanical damage during excavation. Figure 10. Distribution of P-wave velocity determined by seismic refraction survey in the NATM drift.
6 b) The spatial extent of the EDZ and the degree of change in rock properties due to the excavation Table-1 summarizes the rock properties and spatial extent of the EDZ detected in the NATM drift. Mechanical excavation is effective to reduce excavation disturbance and maintain the desired rock properties around underground openings. The EDZ induced by blasting excavation has a width of about 0.8m and a P-wave velocity of 50-60% of that of the intact rock. Hydraulic conductivity is increased by more than one order of magnitude within at most 1.4m from the drift wall. Figure 11. Mesh layout and input data of numerical analysis for rock mass displacement. Table 1 Extent and properties of the EDZ detected in the Tono Mine Figure 12. Rock mass displacements measured by extensometer compared to the numerical analysis using FEM 5. Conclusions The in-situ experiments on EDZ in the Tono Mine and the Kamaishi Mine indicate that the main process related to change in rock properties within the EDZ is mainly fracturing by the shock wave during blasting. It caused large changes in rock properties in both sedimentary and granitic rocks. Stress concentration in the vicinity of drift walls is also a possible cause of damage in the deep underground like the Kamaishi Mine. The spatial extent of the EDZ is around 1m from drift wall in the case of blasting in both rocks. The degree of the permeability change in the damaged zone is one to two orders of magnitude larger than of host rock. In the stress redistributed zone, the permeability change affect to performance assessment were not detected in both experiments.
7 6. Acknowlegements The authors thank Dr. Glen McClank of Glenelg Geoscience for valuable comments and manuscript revision. Reference T. Sato, T. Kikuchi and K. Sugihara (2000): In-situ experiments on an excavation disturbed zone induced by mechanical excavation in Neogene sedimentary rock at Tono mine, central Japan, Engineering Geology Vol. 56 pp K. Sugihara, H. Matsui and T. Sato (1999): In-situ Experiments on Rock Stress Condition and Excavation Disturbance in JNC s Geoscientific Research Program in Japan A Rock Mechanical Basis of Underground Research Laboratory Project-, Proceedings of the international workshop on the Rock Mechanics of Nuclear Waste Repositories pp
ENGINEERING GEOLOGY AND ROCK ENGINEERING ASPECTS OF OPERATION AND CLOSURE OF KBS-3
ENGINEERING GEOLOGY AND ROCK ENGINEERING ASPECTS OF OPERATION AND CLOSURE OF KBS-3 DAVID SAIANG Principal Consultant SRK Consulting Sweden NEIL MARSHALL Corporate Consultant SRK Consulting UK 1 of XX SRK
More informationA PARAMETER STUDY OF THE DAMAGED ROCK ZONE AROUND SHALLOW TUNNELS IN BRITTLE ROCK MASS
A PARAMETER STUDY OF THE DAMAGED ROCK ZONE AROUND SHALLOW TUNNELS IN BRITTLE ROCK MASS D. SAIANG 1 and E. NORDLUND 1 1 Division of Rock Mechanics and Rock Engineering, Luleå University of Technology, Sweden.
More informationGround Support in Mining and Underground Construction
Ground Support in Mining and Underground Construction Proceedings of the Fifth International Symposium on Ground Support 28-30 September 2004, Perth, Western Australia Edited by Ernesto Villaescusa Yves
More information2 Overview of the geoscientific research in the MIU Project
2 Overview of the geoscientific research in the MIU Project The MIU Project is located at the Shobasama Site in Akeyo-cho, Mizunami City, Gifu Prefecture. The geoscientific research carried out for the
More informationGround support modelling involving large ground deformation: Simulation of field observations Part 1
Ground Support 2016 E. Nordlund, T.H. Jones and A. Eitzenberger (eds) Ground support modelling involving large ground deformation: Simulation of field observations Part 1 D.Saiang, Luleå University of
More informationAn approach for the host rock assessment methodology. based on URLs site investigation data
1 An approach for the host rock assessment methodology development tin JAEA, based on URLs site investigation data Workshop on Assessing the suitability of host rock Yokohama Minato Mirai, Landmark Tower
More informationCollaborating partners: NAGRA (CH), L3S (FR), G3S (FR), KUL (B), EPFL (CH), SOLEXPERTS (CH)
SELFRAC Fractures and self-healing within the excavationdisturbed zone in clays Type of test: Clay characterisation Collaborating partners: NAGRA (CH), L3S (FR), G3S (FR), KUL (B), EPFL (CH), SOLEXPERTS
More informationIntroduction and Background
Introduction and Background Itasca Consulting Group, Inc. (Itasca) has been participating in the geomechanical design of the underground 118-Zone at the Capstone Minto Mine (Minto) in the Yukon, in northwestern
More informationWeak Rock - Controlling Ground Deformations
EOSC 547: Tunnelling & Underground Design Topic 7: Ground Characteristic & Support Reaction Curves 1 of 35 Tunnelling Grad Class (2014) Dr. Erik Eberhardt Weak Rock - Controlling Ground Deformations To
More informationSupplementary Uniaxial Compressive Strength Testing of DGR-3 and DGR-4 Core
Technical Report Title: Document ID: Authors: Supplementary Uniaxial Compressive Strength Testing of DGR-3 and DGR-4 Core TR-08-39 B. Gorski, T. Anderson and D. Rodgers CANMET Mining and Mineral Sciences
More informationThe use of Underground Research Facilities in the development of deep geological disposal
The use of Underground Research Facilities in the development of deep geological disposal Radioactive Waste: Meeting the Challenge Science and Technology for Safe and Sustainable Solutions 23-24 September
More informationA25 Very High Resolution Hard Rock Seismic Imaging for Excavation Damage Zone Characterisation
A25 Very High Resolution Hard Rock Seismic Imaging for Excavation Damage Zone Characterisation C. Cosma* (Vibrometric Oy), N. Enescu (Vibrometric Oy) & E. Heikkinen (Pöyry Finland Oy) SUMMARY Seismic and
More informationUnloading Phenomena Characteristics in Brittle Rock Masses by A Large- Scale Excavation in Dam Foundation
Send Orders for Reprints to reprints@benthamscience.net The Open Civil Engineering Journal, 2014, 8, 177-182 177 Open Access Unloading Phenomena Characteristics in Brittle Rock Masses by A Large- Scale
More informationDeep Borehole Disposal Performance Assessment and Criteria for Site Selection
Deep Borehole Disposal Performance Assessment and Criteria for Site Selection Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department
More informationThermal and Mechanical Influence of a Deep Geological Repository in Crystalline Rock on the Ground Surface
Thermal and Mechanical Influence of a Deep Geological Repository in Crystalline Rock on the Ground Surface NWMO-TR-2016-15 October 2016 Ruiping Guo Nuclear Waste Management Organization Nuclear Waste Management
More informationMathematical Modelling of a Fault Slip Induced by Water Injection
Mathematical Modelling of a Fault Slip Induced by Water Injection T. S. Nguyen, 1 J.Rutqvist 2 and Y. Gugliemi 2 1 Canadian Nuclear Safety Commission 2 Lawrence Berkeley National Laboratory ComGeo IV Symposium
More informationHydrogeology of Deep Borehole Disposal for High-Level Radioactive Waste
SAND2014-18615C Hydrogeology of Deep Borehole Disposal for High-Level Radioactive Waste Geological Society of America Annual Meeting October 20, 2014 Bill W. Arnold, W. Payton Gardner, and Patrick V. Brady
More informationExperimental program in the URL
Experimental program in the URL Jacques Delay Deputy Scientific Director July 21-24 th 2009 AGENCE NATIONALE POUR LA GESTION DES DÉCHETS RADIOACTIFS URL First construction step (2000 2006) Experimental
More informationSuccessful Construction of a Complex 3D Excavation Using 2D and 3D Modelling
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2015 Successful Construction of a Complex 3D Excavation Using 2D and 3D Modelling Yvette
More informationFRACTURE REORIENTATION IN HORIZONTAL WELL WITH MULTISTAGE HYDRAULIC FRACTURING
SPE Workshop OILFIELD GEOMECHANICS Slide 1 FRACTURE REORIENTATION IN HORIZONTAL WELL WITH MULTISTAGE HYDRAULIC FRACTURING A. Pimenov, R. Kanevskaya Ltd. BashNIPIneft March 27-28, 2017 Moscow, Russia Slide
More informationGeotechnical & Mining Engineering Services
Geotechnical & Mining Engineering Services Southwest Research Institute San Antonio, Texas A s an independent, nonprofit research and development organization, Southwest Research Institute (SwRI ) uses
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 informationCNSC Review of the Long-Term Safety Case for a Deep Geologic Repository
CNSC Review of the Long-Term Safety Case for a Deep Geologic Repository T. Son Nguyen Geoscience Specialist Brugg, Switzerland May 13, 2016 e-doc 4972224 nuclearsafety.gc.ca Content Ontario Power Generation
More informationSome Thoughts About Rock Mechanics Aspects of Mars. Ömer Aydan
3 rd Off Earth Mining Forum - 2017OEMF Some Thoughts About Rock Mechanics Aspects of Mars Courtesy of NASA Opportunity Curiosity Spirit Ömer Aydan University of the Ryukyus, Department of Civil Engineering
More informationENGINEERING GEOLOGY AND ROCK ENGINEERING
1 ENGINEERING GEOLOGY AND ROCK ENGINEERING HANDBOOK NO. 2 Norwegian Group for Rock Mechanics (NBG) www.bergmekanikk.com Prepared in co-operation with Norwegian Tunnelling Society (NFF) Issued in 2000 SECRETARIAT:
More informationLong-Term Strength Degradation Testing of DGR-3 and DGR-4 Core
Technical Report Title: Document ID: Authors: Long-Term Strength Degradation Testing of DGR-3 and DGR-4 Core TR-08-36 B. Gorski, T. Anderson and B. Conlon CANMET Mining and Mineral Sciences Laboratories,
More informationThe Mine Geostress Testing Methods and Design
Open Journal of Geology, 2014, 4, 622-626 Published Online December 2014 in SciRes. http://www.scirp.org/journal/ojg http://dx.doi.org/10.4236/ojg.2014.412046 The Mine Geostress Testing Methods and Design
More informationM035 High Resolution 3D Tunnel Seismic Reflection at Olkiluoto, Finland
M035 High Resolution 3D Tunnel Seismic Reflection at Olkiluoto, Finland C. Cosma* (Vibrometric), N. Enescu (Vibrometric), M. Lahti (Posiva Oy), E. Heikkinen (Poyry Oy) & T. Ahokas (Poyry Oy) SUMMARY ONKALO
More informationSELF-HEALING OF FRACTURES WITHIN THE EDZ AT THE MT. TERRI ROCK LABORATORY : RESULTS AFTER ONE YEAR OF EXPERIMENTAL WORK
SELF-HEALING OF FRACTURES WITHIN THE EDZ AT THE MT. TERRI ROCK LABORATORY : RESULTS AFTER ONE YEAR OF EXPERIMENTAL WORK Peter M. Meier (1), Thomas Trick (), Peter Blümling (3) and Geert Vockaert () (1)
More informationGeotechnical Monitoring for Safe Excavation of Large Rock Cavern: A Case Study
The 31st International Symposium on Automation and Robotics in Construction and Mining (ISARC 2014) Geotechnical Monitoring for Safe Excavation of Large Rock Cavern: A Case Study A.Mandal a, C. Kumar b,
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 informationY. Shioi 1, Y. Hashizume 2 and H. Fukada 3
Y. Shioi 1, Y. Hashizume 2 and H. Fukada 3 1 Emeritus Professor, Hachinohe Institute of Technology, Hachinohe, Japan 2 Chief Engineer, Izumo, Misawa, Aomori, Japan 3 Profesr, Geo-Technical Division, Fudo
More informationFinal design of Belesar III and Los Peares III Hydropower Projects. (Galicia, Spain).
Final design of Belesar III and Los Peares III Hydropower Projects. (Galicia, Spain). J. Baztán and A. Martín Gas Natural Fenosa Engineering, S.L.U, Madrid, Spain. J. M. Galera and D. Santos Subterra Ingeniería
More informationSwelling Pressure Due to volumetric Expansion of a rock mass having swelling minerals when comes in contact with water
Basic Definitions Swelling Pressure Due to volumetric Expansion of a rock mass having swelling minerals when comes in contact with water Primitivestress Stress in the state of equilibrium Induced stress
More informationExcavation unloading destruction phenomena in rock dam foundations
Bull Eng Geol Environ (2009) 68:257 262 DOI 10.1007/s10064-009-0202-5 ORIGINAL PAPER Excavation unloading destruction phenomena in rock dam foundations Faquan Wu Æ Tong Liu Æ Jianyou Liu Æ Xianliang Tang
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 informationUnderground Excavation Design Classification
Underground Excavation Design Underground Excavation Design Classification Alfred H. Zettler alfred.zettler@gmx.at Rock Quality Designation Measurement and calculation of RQD Rock Quality Designation index
More informationPROBABILISTIC TRANSPORT PATH ANALYSIS THROUGH THREE-DIMENSIONAL DISCRETE FRACTURE NETWORKS FOR UNDERGROUND RADIOACTIVE WASTE DISPOSAL FACILITIES
th International Conference on Probabilistic Safety Assessment and Management (PSAM ) PROBABILISTIC TRANSPORT PATH ANALYSIS THROUGH THREE-DIMENSIONAL DISCRETE FRACTURE NETWORKS FOR UNDERGROUND RADIOACTIVE
More informationNZQA unit standard New US6 to replace and version 1 Page 1 of 5
Page 1 of 5 Title Demonstrate knowledge of mining methods, and analyse and select plant for metalliferous underground extraction Level 6 Credits 20 Purpose People credited with this unit standard are able
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 informationStress measurements a Scandinavian perspective. Jonny Sjöberg Itasca Consultants AB (Sweden)
Stress measurements a Scandinavian perspective Jonny Sjöberg Itasca Consultants AB (Sweden) Scandinavian experiences Deep overcoring the Borre probe OC experiences & quality control A new LVDT overcoring
More information1 of 46 Erik Eberhardt UBC Geological Engineering ISRM Edition
Rock Engineering Practice & Design Lecture 12: Rock Stabilization Principles 1 of 46 Erik Eberhardt UBC Geological Engineering ISRM Edition Author s Note: The lecture slides provided here are taken from
More informationBehaviour of Blast-Induced Damaged Zone Around Underground Excavations in Hard Rock Mass Problem statement Objectives
Behaviour of Blast-Induced Damaged Zone Around Underground Excavations in Hard Rock Mass Problem statement Blast-induced damaged zone can affect the affect stability and performance of tunnel. But, we
More information1. Rock Mechanics and mining engineering
1. Rock Mechanics and mining engineering 1.1 General concepts Rock mechanics is the theoretical and applied science of the mechanical behavior of rock and rock masses; it is that branch of mechanics concerned
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 informationIntroduction to the Mizunami URL and details of site visit
Introduction to the Mizunami URL and details of site visit Japan Atomic Energy Agency Crystalline Environment Research Group Geological Isolation Research and Development Directorate Takanori KUNIMARU
More informationDamage-free coring technique for rock mass under high in-situ stresses
Journal of Rock Mechanics and Geotechnical Engineering. 2012, 4 (1): 44 53 Damage-free coring technique for rock mass under high in-situ stresses Peng Yan 1, 2, 3, Wenbo Lu 1, 2*, Ming Chen 1, 2, Zhigang
More informationDeep Borehole Field Test Overview. Presentation Overview
Deep Borehole Field Test Overview David C. Sassani Sandia National Laboratories Used Fuel Disposition R&D Campaign The Institute for Nuclear Materials Management 32nd Spent Fuel Management Seminar Washington,
More informationExpertise from Surface to Great Depths
Expertise from Surface to Great Depths Helsinki, Railway Line15 m Stockholm Waste Water Plant 45 m Tosbotn, Hydro Power tunnel 200 m ONKALO & Äspö HRL from 160 to 440 m Kylylahti Mine 400 m and 650 m Tara
More informationSYLLABUS AND REFERENCES FOR THE STRATA CONTROL CERTIFICATE COAL MINING OPTION
CHAMBER OF MINES OS SOUTH AFRICA SYLLABUS AND REFERENCES FOR THE STRATA CONTROL CERTIFICATE COAL MINING OPTION 1. PART 1 : THEORY 1.1 Basic principles of rock engineering 1.1.1 Terms, definitions and basic
More informationMain Means of Rock Stress Measurement
Real Stress Distributions through Sedimentary Strata and Implications for Reservoir Development and Potential Gas and Coal Development Strategies Ian Gray Sigra Pty Ltd 93 Colebard St West, Acacia Ridge,
More informationLaboratory Triaxial and Permeability Tests on Tournemire Shale and Cobourg Limestone (Contract : R413.8) FINAL REPORT
RSP-413.8 Laboratory Triaxial and Permeability Tests on Tournemire Shale and Cobourg Limestone (Contract 87055-14-0209: R413.8) FINAL REPORT M.H.B. Nasseri, Ph.D and R.P. Young, Ph.D University of Toronto
More informationActivity Submitted by Tim Schroeder, Bennington College,
Structural Analysis of a Hot Dry Rock Geothermal Energy System Activity Submitted by Tim Schroeder, Bennington College, tschroeder@bennington.edu Description: This project applies basic geologic skills
More informationWITPRESS WIT Press publishes leading books in Science and Technology. Visit our website for the current list of titles.
High-Level Radioactive Waste (HLW) Disposal WITPRESS WIT Press publishes leading books in Science and Technology. Visit our website for the current list of titles. www.witpress.com WITeLibrary Home of
More informationHYDRAULIC INVESTIGATION OF THE EXCAVATION DISTURBED ZONE AROUND DRIFTS IN ROCK SALT
HYDRAULIC INVESTIGATION OF THE EXCAVATION DISTURBED ZONE AROUND DRIFTS IN ROCK SALT ABSTRACT Johannes Droste, Klaus Wieczorek, Ulrich Zimmer Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) mbh D-381
More informationIn situ stress estimation using acoustic televiewer data
Underground Mining Technology 2017 M Hudyma & Y Potvin (eds) 2017 Australian Centre for Geomechanics, Perth, ISBN 978-0-9924810-7-0 https://papers.acg.uwa.edu.au/p/1710_39_goodfellow/ SD Goodfellow KORE
More informationDevelopment of the NUMO pre-selection, site-specific safety case
P.0 Development of the NUMO pre-selection, site-specific safety case 24 th November 2016, Vienna, Austria International Conference on the Safety of Radioactive Waste Management, IAEA Nuclear Waste Management
More informationModule 9 : Foundation on rocks. Content
FOUNDATION ON ROCKS Content 9.1 INTRODUCTION 9.2 FOUNDATION TYPES ON ROCKS 9.3 BEARING CAPCITY- SHALLOW FOUNDATION 9.3.1 Ultimate bearing capacity 9.3.2 Safe bearing pressure 9.3.3 Estimation of bearing
More informationFlin Flon Mining Belt
EOSC433: Geotechnical Engineering Practice & Design Lecture 7: Stress Analysis around Underground Openings 1 of 40 Erik Eberhardt UBC Geological Engineering EOSC 433 (2007) Flin Flon Mining Belt Since
More informationBuilding on Past Experiences Worker Safety
EOSC433: Geotechnical Engineering Practice & Design Lecture 11: Rock Stabilization Principles 1 of 43 Erik Eberhardt UBC Geological Engineering EOSC 433 (2016) Building on Past Experiences Worker Safety
More information5.1 Conceptual Rock Mechanics Model and Its Component Parts
123 5 ROCK MECHANICS This chapter describes the Rock Mechanics Descriptive Modelling. The modelling uses the characterisation data listed in Section 2.3 and the resulting rock mechanics model will then
More informationIAEA SAFETY STANDARDS Geotechnical Aspects of Site Evaluation and Foundations in NPPs, NS-G-3.6
IAEA SAFETY STANDARDS Geotechnical Aspects of Site Evaluation and Foundations in NPPs, NS-G-3.6 Regional Workshop on Volcanic, Seismic, and Tsunami Hazard Assessment Related to NPP Siting Activities and
More information3D ANALYSIS OF STRESSES AROUND AN UNLINED TUNNEL IN ROCK SUBJECTED TO HIGH HORIZONTAL STRESSES
3D ANALYSIS OF STRESSES AROUND AN UNLINED TUNNEL IN ROCK SUBJECTED TO HIGH HORIZONTAL STRESSES Abdel Meguid, M. Graduate Student, Department of Civil Engineering, University of Western Ontario, London,
More information1. Introduction. 2. Model Description and Assumptions
Excerpt from the Proceedings of the COMSOL Conference 2010 Boston The Dissolution and Transport of Radionuclides from Used Nuclear Fuel in an Underground Repository Y. Beauregard *1, M. Gobien 2, F. Garisto
More informationInfluence of foliation on excavation stability at Rampura Agucha underground mine
Recent Advances in Rock Engineering (RARE 2016) Influence of foliation on excavation stability at Rampura Agucha underground mine P Yadav, A Panda, M Sonam, B Banerjee, S Parihar, and DC Paneri Geotechnical
More information3D 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 informationMizunami Underground Research Laboratory Project - Achievment during Phase I/II and Important Issues for Phase III - Katsuhiro Hama Tono Geoscience Ce
Mizunami Underground Research Laboratory Project - Achievment during Phase I/II and Important Issues for Phase III - Katsuhiro Hama Tono Geoscience Center Japan Atomic Energy Agency 1-64, Yamanouchi, Akiyo-cho,
More informationNumerical Approach to Predict the Strength of St. Peter Sandstone Pillars acted upon by Vertical Loads A case study at Clayton, IA, USA.
IOSR Journal of Engineering (IOSRJEN) ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 05, Issue 01 (January. 2015), V2 PP 36-41 www.iosrjen.org Numerical Approach to Predict the Strength of St. Peter Sandstone
More informationEXAMINATION PAPER MEMORANDUM
EXAMINATION PAPER MEMORANDUM SUBJECT: CERTIFICATE IN ROCK MECHANICS PAPER 3.1 : HARD ROCK TABULAR EXAMINER: PJ LE ROUX SUBJECT CODE: COMRMC EXAMINATION DATE: MAY 2015 TIME: MODERATOR: WM BESTER TOTAL MARKS:
More informationUnderground Storage & Disposal - The Salt Concept. Thomas Brasser - GRS
Underground Storage & Disposal - The Salt Concept Thomas Brasser - GRS Who is GRS ( Plant & Reactor Safety Ltd. ) Non-profit, independent expert and research organisation Assess and improve safety of technical
More informationSYLLABUS AND REFERENCES FOR THE STRATA CONTROL CERTIFICATE. METALLIFEROUS MINING OPTION Updated November 1998
CHAMBER OF MINES OF SOUTH AFRICA SYLLABUS AND REFERENCES FOR THE STRATA CONTROL CERTIFICATE METALLIFEROUS MINING OPTION Updated November 1998 1 PART 1 : THEORY 1.1 Basic principles of rock engineering
More informationEngineering Geophysical Application to Mine Subsidence Risk Assessment
Engineering Geophysical Application to Mine Subsidence Risk Assessment By: Kanaan Hanna, Sr. Mining Engineer Steve Hodges, Sr. Geophysicist Jim Pfeiffer, Sr. Geophysicist Dr. Keith Heasley, Professor West
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 informationDESIGN AND CONSTRUCTION OF LARGE
DESIGN AND CONSTRUCTION OF LARGE TUNNELS IN SOIL AND FAULTED ROCK SENTVID TUNNEL MOTORWAY BYPASS OF LJUBLJANA Josef Daller, ic consulenten, Vienna - Austria International NATM Workshop Singapore 2010 LAYOUT
More informationNumerical Simulation on Support of Roadway with Compound Roof and Large Cross Section
Numerical Simulation on Support of Roadway with Compound Roof and Large Cross Section YUE Zhong-wen, YANG Ren-shu, YAN Zhen-dong, WANG Guo-dong, WU Bao-yang School of Mechanics & Civil Engineering China
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 informationMECHANICAL AND HYDROMECHANICAL BEHAVIOR OF HOST SEDIMENTARY ROCKS FOR DEEP GEOLOGICAL REPOSITORY FOR. Hadj Abdi. Thesis submitted to the
MECHANICAL AND HYDROMECHANICAL BEHAVIOR OF HOST SEDIMENTARY ROCKS FOR DEEP GEOLOGICAL REPOSITORY FOR NUCLEAR WASTES Hadj Abdi Thesis submitted to the Faculty of Graduate and Postdoctoral Studies in partial
More informationConstruction Technical Specifications on Rock-Foundation Excavating Engineering of Hydraulic Structures
DL Electric Power Industry Standard of the People's Republic of China P DL I T 5389-- Construction Technical Specifications on Rock-Foundation Excavating Engineering of Hydraulic Structures DL/T 5389-
More informationCurrent Status of R&D Activities and Future Plan and Role of JAEA s Two Generic URLs
Current Status of R&D Activities and Future Plan and Role of JAEA s Two Generic URLs - 15356 Kaoru Koide* a, Hideaki Osawa*, Hiroaki Ito**, Kenji Tanai**, Takeshi Semba***, Morimasa Naito***, Kozo Sugihara*
More informationIn situ fracturing mechanics stress measurements to improve underground quarry stability analyses
In situ fracturing mechanics stress measurements to improve underground quarry stability analyses Anna M. Ferrero, Maria R. Migliazza, Andrea Segalini University of Parma, Italy Gian P. Giani University
More informationSpecial edition paper
Development of New Aseismatic Structure Using Escalators Kazunori Sasaki* Atsushi Hayashi* Hajime Yoshida** Toru Masuda* Aseismatic reinforcement work is often carried out in parallel with improvement
More informationInfluence of the undercut height on the behaviour of pillars at the extraction level in block and panel caving operations
Caving 2018 Y Potvin and J Jakubec (eds) 2018 Australian Centre for Geomechanics, Perth, ISBN 978-0-9924810-9-4 https://papers.acg.uwa.edu.au/p/1815_24_alvarez/ Influence of the undercut height on the
More informationGas Shale Hydraulic Fracturing, Enhancement. Ahmad Ghassemi
Gas Shale Hydraulic Fracturing, Stimulated Volume and Permeability Enhancement Ahmad Ghassemi Tight Gas A reservoir that cannot produce gas in economic quantities without massive fracture stimulation treatments
More informationLaboratory Geomechanical Strength Testing of DGR-2 to DGR-6 Core
Technical Report Title: Document ID: Authors: Laboratory Geomechanical Strength Testing of DGR-2 to DGR-6 Core TR-9-7 B. Gorski, D. Rodgers and B. Conlon CANMET Mining and Mineral Sciences Laboratories,
More informationMEMORANDUM SUBJECT: CERTIFICATE IN ROCK MECHANICS PAPER 1 : THEORY SUBJECT CODE: COMRMC MODERATOR: H YILMAZ EXAMINATION DATE: OCTOBER 2017 TIME:
MEMORANDUM SUBJECT: CERTIFICATE IN ROCK MECHANICS PAPER 1 : THEORY EXAMINER: WM BESTER SUBJECT CODE: COMRMC EXAMINATION DATE: OCTOBER 2017 TIME: MODERATOR: H YILMAZ TOTAL MARKS: [100] PASS MARK: (60%)
More informationCase study comparing from Q-system and Terzaghi s Rock Load Classification. *Han Fook Kwang and Cho Man-Sup 1)
Case study comparing from Q-system and Terzaghi s Rock Load Classification *Han Fook Kwang and Cho Man-Sup 1) 1) SK E&C, Singapore ABSTRACT This paper compares Terzaghi s Rock Load Classification System
More informationGeoscientific Verification Plan
Geoscientific Verification Plan March 2011 Prepared by: Nuclear Waste Management Organization NWMO DGR-TR-2011-38 Geoscientific Verification Plan March 2011 Prepared by: Nuclear Waste Management Organization
More informationNumerical Analysis of the Influence of Seepage on the Displacement Law of Different Overburden Strata
2nd International Forum on lectrical ngineering and Automation (IFA 2015) Numerical Analysis of the Influence of Seepage on the Displacement Law of Different Overburden Strata WANG Yun-ping1, a, ZHAO De-shen2,
More informationAn introduction to the Rock Mass index (RMi) and its applications
Reference: A. Palmström, www.rockmass.net An introduction to the Rock Mass index (RMi) and its applications by Arild Palmström, Ph.D. 1 Introduction Construction materials commonly used in civil engineering
More informationInitial Borehole Drilling and Testing in Central Huron,
JULY 2016 PRELIMINARY ASSESSMENT OF POTENTIAL SUITABILITY Initial Borehole Drilling and Testing in Central Huron, Huron-Kinloss and South Bruce DRAFT FOR DISCUSSION WITH COMMUNITIES In 2012, at the request
More informationRock slope failure along non persistent joints insights from fracture mechanics approach
Rock slope failure along non persistent joints insights from fracture mechanics approach Louis N.Y. Wong PhD(MIT), BSc(HKU) Assistant Professor and Assistant Chair (Academic) Nanyang Technological University,
More informationSession 3: Geology and Rock Mechanics Fundamentals
Session 3: Geology and Rock Mechanics Fundamentals Geotechnical Engineering Appreciation Course (Jointly organised by IES Academy and GeoSS) Dr Zhou Yingxin, Senior Principal Engineer, DSTA Adjuct Associate
More informationINFLUENCE OF WATER-SOAKING TIME ON THE ACOUSTIC EMISSION CHARACTERISTICS AND SPATIAL FRACTAL DIMENSIONS OF COAL UNDER UNIAXIAL COMPRESSION
THERMAL SCIENCE: Year 07, Vol., Suppl., pp. S37-S334 S37 INFLUENCE OF WATER-SOAKING TIME ON THE ACOUSTIC EMISSION CHARACTERISTICS AND SPATIAL FRACTAL DIMENSIONS OF COAL UNDER UNIAXIAL COMPRESSION by Zheqiang
More informationExperimental study of mechanical and thermal damage in crystalline hard rock
Experimental study of mechanical and thermal damage in crystalline hard rock Mohammad Keshavarz Réunion Technique du CFMR - Thèses en Mécanique des Roches December, 3 nd 2009 1 Overview Introduction Characterization
More informationInstructional Objectives
GE 6477 DISCONTINUOUS ROCK 8. Fracture Detection Dr. Norbert H. Maerz Missouri University of Science and Technology (573) 341-6714 norbert@mst.edu Instructional Objectives 1. List the advantages and disadvantages
More informationClays in Geological Disposal Systems
Clays in Natural and Engineered Barriers for Radioactive Waste Confinement Clays in Geological Disposal Systems A brochure edited by ONDRAF/NIRAS (Belgium) and Andra (France), in collaboration with COVRA
More informationMicro-chemical Probe: Powerful New Tool for Assessing Radioactive Waste Geological Disposal Sites
Hitachi Review Vol. 56 (27), No. 4 119 Micro-chemical Probe: Powerful New Tool for Assessing Radioactive Waste Geological Disposal Sites Takuma Yoshida Akira Sasahira, Dr. Sc. Kenji Noshita OVERVIEW: NUMO
More informationMicro Seismic Monitoring Technique and Practice of Rock Blast in Deep Mining
Micro Seismic Monitoring Technique and Practice of Rock Blast in Deep Mining Guo Lijie School of Resources and Safety Engineering, Central South University, Changsha 410083, China Beijing General Research
More informationFinite difference modelling in underground coal mine roadway
University of Wollongong Research Online Coal Operators' Conference Faculty of Engineering and Information Sciences 2017 Finite difference modelling in underground coal mine roadway Ali Akbar Sahebi University
More informationUnderground nuclear waste storage
Underground nuclear waste storage Groundwater flow and radionuclide transport Jan-Olof Selroos Cargese Summer School, July 5, 2018 Contents: Concept for geological disposal of nuclear waste A few words
More information