PRELIMINARY INVESTIGATION ON THE FAILURE OF THE BA-LING CHECK DAM IN THE WATERSHED OF SHI-MEN RESERVOIR IN TAIWAN
|
|
- Abraham Sutton
- 5 years ago
- Views:
Transcription
1 PRELIMINARY INVESTIGATION ON THE FAILURE OF THE BA-LING CHECK DAM IN THE WATERSHED OF SHI-MEN RESERVOIR IN TAIWAN Su-Chin Chen. 1 *, Yu-Hsan Chang 2, Ben-Kang Chen 3, Yi-Chuan Liu 4, Zheng-Yi Feng, 5*, Lai, Bor-Hsun Lai 6 ABSTRACT The Ba-ling check dam built in 1960s collapsed during Typhoon Wayne in September, To understand the causes of the failure, this study investigates the geological and hydrological conditions near the dam site. In addition, concrete core samples and rebars were collected from the dam remains to examine the strengths of the materials. It is shown that both the strengths of concrete and rebars are actually not severe degraded. The foundation of the dam was excavated and drilling work was carried out to better understand the situation of riverbed and the foundation base. Electrical resistivity image profile was executed for 3 sections to estimate the erosion of the dam foundation and bearing strata. Preliminary investigation results are obtained indicating that the failure could be due to erosion of the foundation base of the dam. In addition the base is not founded on a firm rock layer while it was built, which causes the foundation base to loosen during flood scouring and stress concentration in the dam body. However, the failure mechanism has to be further investigated and verified. Key Words: Dam, Resistivity image profile, Scouring, failure INTRODUCTION The Ba-ling check dam was built on the riverbed of Dahan River in Shihmen watershed near Taoyuan, Taiwan (UTM coordinate , ). It is a very large counterfort concrete dam filled with soils, including the top slab, counterfort buttresses, face wall, bottom slab and back-fillings as shown in the cross-sections of Figure 1 and 2. The dam was completed in 1977 with height of 38m and length of 80 m. It was blocking about billion m 3 of sediments. During the attack of Typhoon Wayne on September 18 of 2007, the dam finally 1 Professor and Chairman, Department of Soil and Water Conservation, National Chung-Hsing University, Taichung 402, Taiwan, R.O.C 2 Doctoral Student, Department of Soil and Water Conservation, National Chung-Hsing University, Taichung 402, Taiwan, R.O.C 3 Chairman, Kang and Associates, Inc., Taiwan 4 Section Chief, Northern Region Water Resources Office, Water Resources Agency, Ministry of Economic Affairs, Taiwan, R.O.C 5 Associate Professor, Department of Soil and Water Conservation, National Chung-Hsing University, Taichung 402, Taiwan, R.O.C (*Corresponding Author, Tel: , Fax: , tonyfeng@nehu.edu.tw) 6 Director, Northern Region Water Resources Office, Water Resources Agency, Ministry of Economic Affairs, Taiwan, R.O.C -348-
2 reached failure state after 30 years of service. Photos taken before and after failure of the dam are shown in Figure 3. In order to know the dam's structure strength, concrete strength tests and rebar tensile tests were carried out. For better understanding the failure situation of the dam, excavation, drilling and electrical resistivity imaging were performed. A B B A Fig.1 Layout of Ba-ling check dam Section A-A Fig.2 Cross-sections of Ba-ling check dam Section B-B -349-
3 Fig. 3a. The dam was fully filled and there is no more capacity for sediment. Landslide happened at the left abutment of the dam. (2002/10/24) Fig. 3b. The face wall of the dam was still normal; however, two secondary downstream dams were failed. (2005/9/7) Fig. 3c. Work was done to prevent the enlargement of landslide. (2006/8/15) Fig. 3d. The dam failed on Sep. 18, 2007 and sediment was transport to downstream. (2007/9/19) Fig. 3e. The riverbed was scoured deeper and the counterfort buttresses were exposed. (2007/9/24) Fig. 3f. Geophysical survey and drilling were conducted for investigation. (2007/10/5) Fig. 3g. The riverbed was further scoured deeper. (2008/10/20) Fig.3 Photos before and after the failure of Ba-ling check dam -350-
4 INVESTIGATIONS FOR THE FAILURE OF THE DAM Geological condition: The geology formations near the dam are slightly metamorphosed rocks, slates and sandstones. As shown in Figure 4, the geological and geomorphological condition is complex. The dip angle of rock formation is changing and overturned, because there is a syncline axis at the downstream of the dam and a fault at the upstream of the dam.. Rock layers were gained the earth stress and transformed into curved, inverse, rend and sheared. Dislocation and fracture of the rock layers can be seen at many locations. The dam was sitting at a geological area. Sediment level before collapse Overturned strata Syncline axis Fig.4 The geological condition near the dam Rainfall records: The maximum one day rainfall records of typhoons attacking the dam area during 2004 ~ 2007 were collected and listed in Fig. 5. Typhoon Aere in 2004 gave a maximum one day rainfall of 452mm and the dam did not failure. Daily Cumulative Rainfall (mm) /8/24 AERE local damages in the secondary dam and left-bank slope /9/12 HAIMA /10/25 NOCK-TEN 2005/7/18 HAITANG /8/5 MATSA /8/31 TALIM Events(Date/Typhoon name) /10/2 LONGWANG /7/13 BILIS PM 4:00 the main dam failed /8/18 SEPAT /9/18 WIPHA Fig.5 Maximum one day rainfall during typhoons in 2004 to 2007 Strength of concrete: Concrete cores were taken from two locations on face slab and three locations at the conterfort buttresses. The compressive strengths of the face slab samples are ranging from 400 to 500 kg/cm 2 and for the buttress samples are ranging from 500 to 750 kg/cm 2. All strengths of the samples are higher than their designated strength of 210 kg/cm 2. Therefore, it is suggested that the failure of dam is not resulting from concrete degradation. Strength of rebar: There are 6 locations chosen of the dam structure to sample re-bars for tests of yielding stress, tensile strength and extension rate. The test results of most re-bar -351-
5 samples fulfill the requirement of the design standard, although a few samples slightly lower than the standard. Therefore, the strength of re-bars is not largely degraded either. Investigation of the foundation of the dam: The bedrock surface of the stream channel varies a lot. Near the left bank the bedrock surface is shallow. Near the right back and central of the river, the bedrock surface is in a deeper depth. Therefore, the foundation of the dam is not all on a sound bedrock surface. Central part and right side of the dam foundation is founded on the sediments of the riverbed. Foundation excavation: Five locations were excavated to check the foundation of the dam as shown in Figure 6. The foundation caissons cannot be found at Location 1, 2 and 3 at the area of the main dam confirming that the foundation is all lost in this area. At Location 4 and 5 of the secondary dam, disintegrated remains of secondary dam concrete were found m Fig.6 Five locations of the excavation Borehole drilling: Drilling work was taken to understand the depth of the surface deposit, the condition of main dam and secondary dam, the quality of bedrock. There were 18 boreholes drilled as shown in Figure 9. The drilling depths are ranging from 17.5 to 33 m and are about 5 to 6 m into the sound bedrock. The result shows that at boreholes BH-4, BH-5, BH-6, BH-7 and BH-8, foundation concrete slabs of the main dam were found at a depth of about 6 to 8 meters, while no concrete was found at BH-9. Concrete cores belonging to the structure of the secondary dam were acquired from BH-10, BH-11 and BH-14. The cores of BH-10 and BH-11 should be parts of the foundation slab of the secondary dam. The concrete core at depth from 9 to 23 m of BH-14 should be the caisson of the secondary dam. There was no concrete sampled at BH-12, BH-13 and BH
6 L2:72m L1:72m Fig.7 Locations of the 18 boreholes and layout of RIP survey L3:186m Legend Location of boreholes Electrical resistivity image profiling: Resistivity image profiling (RIP) was used to find the rough shape of the foundation and caissons of the dam after failure. The layout of the RIP survey is shown in Figure 7. Figure 8 shows the result of L-3 Pole-pole array. The L-3 survey line, 186 m, crosses the main dam and secondary dam. The intervals between the electrodes are 3 m. It is found that the resistivity between the main dam and secondary dam is discontinued which indicates that this part of structure is already lost. Elevation(m) Top the main dam foundation slab NE L-3(Pole-Pole array) SW 470 主壩底版頂部電阻率不連續副壩底版頂部疑似鋼筋 465 水泥斷塊 BH BH-5 L-1 BH-8 L-2 BH-11 BH-14 BH-17 BH 礫石 450 主壩副壩 445 Main dam Secondary dam 岩 盤 Bedrock Distance(m) Fig.8 Results of the L-3 Pole-Pole array RIP Resistivity discontinuous area Top of the secondary dam foundation slab (ohm-m) 鋼筋水泥礫石含水乾燥岩盤 steel concret moist The possible fracture of reinforced concretes gravel dry -353-
7 SUMMARY The structure between the main and secondary dam of Ba-ling check dam was built to prevent scouring of the main dam foundation. However, it was damaged and disappears. This may be the major reason causing the foundation soils beneath the main dam to be scoured away and finally causing the main dam to deform and collapse. It is not likely that this dam is failure by material degradation or not enough strength, because both the strengths tests of concrete and re-bars still fulfill their design standard. The foundation of the dam was not built on sound bedrock or using piles. When the soft gravel materials were scoured, the dam may be tilted, deformed and finally failed. However, additional investigation should be taken to further verification of close failure mechanism. REFERENCES Northern Region Water Resources Office, Water Resources Agency, Ministry of Economic Affairs (2008). Investigation on the Causes of Ba-ling Dem Failure and its Mitigation Plan, Water Resources Agency, Ministry of Economic Affairs, Taipei, Taiwan. (in Chinese) -354-
GIS Application in Landslide Hazard Analysis An Example from the Shihmen Reservoir Catchment Area in Northern Taiwan
GIS Application in Landslide Hazard Analysis An Example from the Shihmen Reservoir Catchment Area in Northern Taiwan Chyi-Tyi Lee Institute of Applied Geology, National Central University, No.300, Jungda
More informationThe effectiveness of check dams in controlling upstream channel stability in northeastern Taiwan
Erosion, Debris Mows and Environment in Mountain Regions (Proceedings of the Chengdu Symposium, July 1992). IAHS Publ. no. 209, 1992. 423 The effectiveness of check dams in controlling upstream channel
More informationStability Analysis of Landslide Dam under Rainfall
Stability Analysis of Landslide Dam under Rainfall Pei-Hsun Tsai, Zheng-Yi Feng 2, Fan-Chieh Yu 3 and Jian-Han Lin 4 Associate Professor, Department of Construction Engineering, Chaoyang University of
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 informationDo you think sediment transport is a concern?
STREAM RESTORATION FRAMEWORK AND SEDIMENT TRANSPORT BASICS Pete Klingeman 1 What is Your Restoration Project Like? k? Do you think sediment transport is a concern? East Fork Lewis River, WA Tidal creek,
More informationEFFECT OF SAND MINING ACTIVITY ON THE SEDIMENT CONTROL SYSTEM (A CASE STUDY OF SOMBE-LEWARA RIVER, DONGGALA, INDONESIA)
Civil Engineering Forum Volume XXI/1 - January 01 EFFECT OF SAND MINING ACTIVITY ON THE SEDIMENT CONTROL SYSTEM (A CASE STUDY OF SOMBE-LEWARA RIVER, DONGGALA, INDONESIA) Y. A. Bawias Agency of Public Works,
More informationENCE 3610 Soil Mechanics. Site Exploration and Characterisation Field Exploration Methods
ENCE 3610 Soil Mechanics Site Exploration and Characterisation Field Exploration Methods Geotechnical Involvement in Project Phases Planning Design Alternatives Preparation of Detailed Plans Final Design
More informationEngineer. Engineering. Engineering. (in-ja-neer ) A person trained and skilled in any of the various branches of engineering: a civil engineer
Engineer (in-ja-neer ) A person trained and skilled in any of the various branches of engineering: a civil engineer (Random House Webster s College Dictionary, 1991) CE100 Introduction to Civil Geotechnical
More informationA STUDY OF LOCAL SCOUR AT BRIDGE PIERS OF EL-MINIA
A STUDY OF LOCAL SCOUR AT BRIDGE PIERS OF EL-MINIA Dr. Gamal A. Sallam 1 and Dr. Medhat Aziz 2 ABSTRACT Bridges are critical structures that require a substantial investment to construct and serve an important
More informationRock Scour: Past, Present and Future. George W. Annandale, D.Ing, P.E. Engineering and Hydrosystems Inc. Denver, Colorado
Rock Scour: Past, Present and Future George W. Annandale, D.Ing, P.E. Engineering and Hydrosystems Inc. Denver, Colorado Outline Rock Scour Process Jet Hydraulics Scour Resistance of Rock Methods of Analysis
More informationA Numerical Method for Determine the Dredging Requirements for Channel Restoration Using Alishan Creek in Central Taiwan as an Example
A Numerical Method for Determine the Dredging Requirements for Channel Restoration Using Alishan Creek in Central Taiwan as an Example Instructors : Dr. Jie-Dar Cheng Dr. Honglay Chen Dr. Chao-Yuan Lin
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 informationAvailable online at ScienceDirect. Procedia Engineering 154 (2016 )
Available online at www.sciencedirect.com ScienceDirect Procedia Engineering 154 (2016 ) 574 581 12th International Conference on Hydroinformatics, HIC 2016 Research on the Strength and Space-time Distribution
More informationTWO DIMENSIONAL MODELING AND STABILITY ANALYSIS OF SLOPES OVERLAYING TO SHAHID RAGAEE POWER PLANT
4 th International Conference on Earthquake Geotechnical Engineering June 25-28, 2007 Paper No. 1637 TWO DIMENSIONAL MODELING AND STABILITY ANALYSIS OF SLOPES OVERLAYING TO SHAHID RAGAEE POWER PLANT Mohammad
More informationStrategies for managing sediment in dams. Iwona Conlan Consultant to IKMP, MRCS
Strategies for managing sediment in dams Iwona Conlan Consultant to IKMP, MRCS 1 Sediment trapping by dams Active storage capacity Dead storage coarse material (bed load) Fine materials (suspension) Francis
More informationApplication of Energy Approach to Estimating Scour Depth
Nature and Science, (), 004, Zhang, et al, Application of Energy Approach Application of Energy Approach to Estimating Scour Depth Xiaodong Zhang 1, Zhiping Liu 1, Chuan Liang, Qiang Fu 3 (1. IWHR, Beijing
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 informationDESCRIBING LANDSCAPE STRUCTURE IMPROVEMENT ACCORDING TO EXPERIMENTAL RESULTS
Journal of Marine Science and Technology, Vol. 23, No. 4, pp. 451-456 (215) 451 DOI: 1.6119/JMST-14-94-1 DESCRIBING LANDSCAPE STRUCTURE IMPROVEMENT ACCORDING TO EXPERIMENTAL RESULTS Fu-Ming Chang 1 and
More informationRogun Hydropower Project
Rogun Hydropower Project Dam site Geological investigations in the Downstream Right Bank Ascencio Lara Coyne et Bellier Almaty, 11-12 February 2013 Objectives of the presentation As the stability conditions
More informationGEOMORPHIC CHANGES OF A LANDSLIDE DAM BY OVERTOPPING EROSION
DOI: 10.4408/IJEGE.2011-03.B-087 GEOMORPHIC CHANGES OF A LANDSLIDE DAM BY OVERTOPPING EROSION K. Yoshino (*), T. Uchida (*), T. shimizu (*) & K. Tamura (*) (*) Incorporated Administrative Agency, Public
More informationPractical aspects of dam break analysis
Practical aspects of dam break analysis Louis C Hattingh Hattingh Anderson Associates CC Dam break analysis It is a model You need to understand what you model & have an idea of the answers that you expect
More informationDebris flow: categories, characteristics, hazard assessment, mitigation measures. Hariklia D. SKILODIMOU, George D. BATHRELLOS
Debris flow: categories, characteristics, hazard assessment, mitigation measures Hariklia D. SKILODIMOU, George D. BATHRELLOS Natural hazards: physical phenomena, active in geological time capable of producing
More informationStatistical Seismic Landslide Hazard Analysis: an Example from Taiwan
Statistical Seismic Landslide Hazard Analysis: an Example from Taiwan Chyi-Tyi Lee Graduate Institute of Applied Geology, National Central University, Taiwan Seismology Forum 27: Natural Hazards and Surface
More informationDISTRIBUTION of WATER RESOURCES
DAM GEOLOGY DISTRIBUTION of WATER RESOURCES Definition A dam is a structure which prevents the flow of water and accumulates it in a reservoir Karakaya Dam/Diyarbakır Atatürk Dam/Şanlıurfa Needs for Dam
More informationmountain rivers fixed channel boundaries (bedrock banks and bed) high transport capacity low storage input output
mountain rivers fixed channel boundaries (bedrock banks and bed) high transport capacity low storage input output strong interaction between streams & hillslopes Sediment Budgets for Mountain Rivers Little
More informationThe process of determining the layers of natural soil deposits that will underlie a proposed structure and their physical properties is generally
The process of determining the layers of natural soil deposits that will underlie a proposed structure and their physical properties is generally referred to as sub surface investigation 2 1 For proper
More informationWATERCOURSE HARNESSING BANK EROSION AND CONSOLIDATION
GUVERNUL MINISTERUL POSDRU MUNCII, FAMILIEI ŞI WATERCOURSE HARNESSING BANK EROSION AND CONSOLIDATION PhD. student: ALUPOAE Daniel Gheorghe Asachi Technical University of Iasi, Faculty of Civil Engineering
More informationToshio MIZUTANI, Takeshi NAKAMURA and Keii BAN (1)
Crushed Rock Mass in Landslide Body of the Cretaceous Sedimentary Rocks Toshio MIZUTANI, Takeshi NAKAMURA and Keii BAN (1) (1) Shikoku Branch, NIPPON KOEI CO., LTD. Abstract We have got an opportunity
More informationUnderstanding disaster risk ~ Lessons from 2009 Typhoon Morakot, Southern Taiwan
Understanding disaster risk ~ Lessons from 2009 Typhoon Morakot, Southern Taiwan Wen Chi Lai, Chjeng-Lun Shieh Disaster Prevention Research Center, National Cheng-Kung University 1. Introduction 08/10
More informationHow to Build a Mountain and other Geologic Structures. But first, questions
How to Build a Mountain and other Geologic Structures But first, questions Questions your students might ask How were Montana s mountains formed? How old are the mountains? What are the different ways
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 informationChapter 6 Bearing Capacity
Chapter 6 Bearing Capacity 6-1. Scope This chapter provides guidance for the determination of the ultimate and allowable bearing stress values for foundations on rock. The chapter is subdivided into four
More informationSeepage Analysis for Shurijeh Reservoir Dam Using Finite Element Method. S. Soleymani 1, A. Akhtarpur 2
Seepage Analysis for Shurijeh Reservoir Dam Using Finite Element Method S. Soleymani 1, A. Akhtarpur 2 1 Group of Dam Construction, Toossab Company, P.O. Box 917751569, Mashhad City, Iran, PH (+98) 511-7684091;
More informationUGRC 144 Science and Technology in Our Lives/Geohazards
UGRC 144 Science and Technology in Our Lives/Geohazards Flood and Flood Hazards Dr. Patrick Asamoah Sakyi Department of Earth Science, UG, Legon College of Education School of Continuing and Distance Education
More informationModeling Great Britain s Flood Defenses. Flood Defense in Great Britain. By Dr. Yizhong Qu
Modeling Great Britain s Flood Defenses AIRCurrents Editor s note: AIR launched its Inland Flood Model for Great Britain in December 2008. The hazard module captures the physical processes of rainfall-runoff
More informationName: KEY. Examine all possible answers; some may not satisfy the question criteria and should be left blank. mica crystals big enough to see
GE 50 Exam #3, FS07 Name: KEY_ Examine all possible answers; some may not satisfy the question criteria and should be left blank. 1. Match the metamorphic rock with its foliated texture. [10 pts] slate
More informationIntegration of Seismic Refraction and 2D Electrical Resistivity in Locating Geological Contact
Open Journal of Geology, 2013, 3, 7-12 doi:10.4236/ojg.2013.32b002 Published Online April 2013 (http://www.scirp.org/journal/ojg) Integration of Seismic Refraction and 2D Electrical Resistivity in Locating
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 informationSITE INVESTIGATION 1
SITE INVESTIGATION 1 Definition The process of determining the layers of natural soil deposits that will underlie a proposed structure and their physical properties is generally referred to as site investigation.
More informationWorking with Natural Stream Systems
Working with Natural Stream Systems Graydon Dutcher Delaware County Soil & Water Conservation District Stream Corridor Management Program Tropical Storm Sandy October 29,2012 What is a Watershed?
More informationMass Wasting. Revisit: Erosion, Transportation, and Deposition
Mass Wasting Revisit: Erosion, Transportation, and Deposition While landslides are a normal part of erosion and surface processes, they can be very destructive to life and property! - Mass wasting: downslope
More informationBirecik Dam & HEPP Downstream River Arrangement R. Naderer, G. Scharler Verbundplan GmbH, 5021 Salzburg, Austria
Birecik Dam & HEPP Downstream River Arrangement R. Naderer, G. Scharler Verbundplan GmbH, 5021 Salzburg, Austria e-mail: scharlerg@verbund.co.at Abstract Birecik Dam & HEPP on the Euphrates river in Turkey
More informationStream Geomorphology. Leslie A. Morrissey UVM July 25, 2012
Stream Geomorphology Leslie A. Morrissey UVM July 25, 2012 What Functions do Healthy Streams Provide? Flood mitigation Water supply Water quality Sediment storage and transport Habitat Recreation Transportation
More informationKnickpoint evolution across anticline structure: A case of uplifted reach in the Taan River, Taiwan
ICSE6-145 Knickpoint evolution across anticline structure: A case of uplifted reach in the Taan River, Taiwan Ming-Wan HUANG 1, Yii-Wen PAN 2, Jyh-Jong LIAO 2, Meng-Hsiung CHENG 3 1 Research Engineer/
More informationName. 4. The diagram below shows a soil profile formed in an area of granite bedrock. Four different soil horizons, A, B, C, and D, are shown.
Name 1. In the cross section of the hill shown below, which rock units are probably most resistant to weathering? 4. The diagram below shows a soil profile formed in an area of granite bedrock. Four different
More informationKRIS wsbssm. IBHiiilll
KRIS wsbssm IBHiiilll Digitized by the Internet Archive in 2012 with funding from University of Illinois Urbana-Champaign http://archive.org/details/engineeringaspec34ekbl STATE OF ILLINOIS HENRY HORNER,
More informationAn Introduction to Field Explorations for Foundations
An Introduction to Field Explorations for Foundations J. Paul Guyer, P.E., R.A. Paul Guyer is a registered mechanical engineer, civil engineer, fire protection engineer and architect with over 35 years
More informationCarmel River Bank Stabilization at Rancho San Carlos Road Project Description and Work Plan March 2018
Carmel River Bank Stabilization at Rancho San Carlos Road Project Description and Work Plan March 2018 EXISTING CONDITION The proposed Carmel River Bank Stabilization at Rancho San Carlos Road Project
More informationDowntown Anchorage Seismic Risk Assessment & Land Use Regulations to Mitigate Seismic Risk
Prepared for: The Municipality of Anchorage Planning Department and the Geotechnical Advisory Commission Downtown Anchorage Seismic Risk Assessment & Land Use Regulations to Mitigate Seismic Risk Prepared
More informationLandslide Remediation Work and Treatment in Taiwan Miau-Bin Su 1, S.M. Chang 2, Y.S.Yen 3
Landslide Remediation Work and Treatment in Taiwan Miau-Bin Su 1, S.M. Chang 2, Y.S.Yen 3 ABSTRACT Landslides are involved in many human activities. Especially in Taiwan, natural environment is not favor
More informationTHE DISCUSS ON THE SEDIMENT DISASTERS CAUSED REASON IN HAOCHA TRIBE AREA
THE DISCUSS ON THE SEDIMENT DISASTERS CAUSED REASON IN HAOCHA TRIBE AREA Chun-Li Hsu 1, Shin-Yi Dai 2 * ABSTRACT From 2005 to 2008 series of typhoons and heavy rainfall makes Haocha tribe suffered serious
More informationPROBLEMS AND SOLUTIONS THAT MAY EMERGE IN THE FOUNDATION AND BODY OF A HOMOGENEOUS FILL DAM ON A WEAK CLAYEY-SILTY-SANDY FORMATION ÇIKRIKÇI DAM
PROBLEMS AND SOLUTIONS THAT MAY EMERGE IN THE FOUNDATION AND BODY OF A HOMOGENEOUS FILL DAM ON A WEAK CLAYEY-SILTY-SANDY FORMATION ÇIKRIKÇI DAM Esen Yalım KARADUMAN BAR-SU Eng. & Conc. Inc. Ankara Turkey
More informationStructural Analysis and Tectonic Investigation of Chamshir Dam Site, South West Zagros
Open Journal of Geology, 2015, 5, 136-143 Published Online March 2015 in SciRes. http://www.scirp.org/journal/ojg http://dx.doi.org/10.4236/ojg.2015.53013 Structural Analysis and Tectonic Investigation
More informationElwha River response to dam removals through four years and a big flood:
Elwha River response to dam removals through four years and a big flood: Lessons learned, channel response, and sediment effects from the world s largest engineered dam removal Andy Ritchie NPS Elwha Restoration
More informationGEOTECHNICAL ENGINEERING II. Subject Code : 06CV64 Internal Assessment Marks : 25 PART A UNIT 1
GEOTECHNICAL ENGINEERING II Subject Code : 06CV64 Internal Assessment Marks : 25 PART A UNIT 1 1. SUBSURFACE EXPLORATION 1.1 Importance, Exploration Program 1.2 Methods of exploration, Boring, Sounding
More informationNATURE OF RIVERS B-1. Channel Function... ALLUVIAL FEATURES. ... to successfully carry sediment and water from the watershed. ...dissipate energy.
1 2 Function... Sevier River... to successfully carry sediment and water from the watershed....dissipate energy. 3 ALLUVIAL FEATURES 4 CHANNEL DIMENSION The purpose of a stream is to carry water and sediment
More informationThe sketch map of field investigations in Wenchuan earthquake hit region, Chengdu City.
The sketch map of field investigations in Wenchuan earthquake hit region, Chengdu City. 1 Environmental and Geological Condition 1.1 Geomorphology BaiSha River Basin is located in Dujiangyan County, and
More informationLANDSLIDES IN THE WHITE MOUNTAIN (GEOTECHNICAL STUDIES AND ENGINEERING TESTS)
J. Al Azhar University Gaza 2004, Vol. 7, NO. 2 P 15-26 LANDSLIDES IN THE WHITE MOUNTAIN (GEOTECHNICAL STUDIES AND ENGINEERING TESTS) Isam G. Jardaneh (1), Jalal Al-Dabeek (2), Abdel hakeem Al-Jawhari
More informationON THE CORRELATION OF SEDIMENTATION AND LANDSLIDES IN WU RIVER CATCHMENT INFLUENCED BY THE 1999 CHI-CHI EARTHQUAKE
ON THE CORRELATION OF SEDIMENTATION AND LANDSLIDES IN WU RIVER CATCHMENT INFLUENCED BY THE 1999 CHI-CHI EARTHQUAKE Keh-Jian Shou 1*, Li-Yuan Fei 2, Jiin-Fa Lee 2, Cheng-Yueh Wei 2, Chiu-Ching Wu 1, Chia-Yue
More informationAnalysis stability of rock slope at left bank of South portal of North tunnel Da Nang Quang Ngai expressway
an ISRM specialized conference Analysis stability of rock slope at left bank of South portal of North tunnel Da Nang Quang Ngai expressway Pham Quoc Tuan a,b *, Phi Hong Thinh c, Nghiem Huu Hanh a a Vietnam
More informationGeology 229 Engineering Geology. Lecture 7. Rocks and Concrete as Engineering Material (West, Ch. 6)
Geology 229 Engineering Geology Lecture 7 Rocks and Concrete as Engineering Material (West, Ch. 6) Outline of this Lecture 1. Rock mass properties Weakness planes control rock mass strength; Rock textures;
More informationGEOL 1121 Earth Processes and Environments
GEOL 1121 Earth Processes and Environments Wondwosen Seyoum Department of Geology University of Georgia e-mail: seyoum@uga.edu G/G Bldg., Rm. No. 122 Seyoum, 2015 Chapter 6 Streams and Flooding Seyoum,
More informationStress and Strain. Stress is a force per unit area. Strain is a change in size or shape in response to stress
Geologic Structures Geologic structures are dynamically-produced patterns or arrangements of rock or sediment that result from, and give information about, forces within the Earth Produced as rocks change
More informationLAND DEGRADATION IN THE CARIBBEAN: QUATERNARY GEOLOGICAL PROCESSES. RAFI AHMAD
EXTENDED TASK FORCE MEETING OF PARTICIPATING AGENCIES AND LATIN AMERICAN COUNTRIES FOR ENHANCING SOUTH-SOUTH COOPERATION BETWEEN LAC-CARIBBEAN SIDS PARTNERSHIP INITIATIVE ON LAND DEGRADATION AND SUSTAINABLE
More informationUse of RMR to Improve Determination of the Bearing Resistance of Rock
Creating Value Delivering Solutions Use of RMR to Improve Determination of the Bearing Resistance of Rock Scott Zang, P.E. Michael Baker Jr., Inc. ASD Design Q v allowable is a presumptive allowable bearing
More informationTHE CASE STUDY OF DEBRIS FLOW hazard CAUSED BY TYPHOON MORAKOT IN TAIWAN, 2009
DOI: 10.4408/IJEGE.2011-03.B-076 THE CASE STUDY OF DEBRIS FLOW hazard CAUSED BY TYPHOON MORAKOT IN TAIWAN, 2009 Meei-Ling LIN (*), Kuo-Lung WANG (*), Tien-Chien CHEN (**) & Shen-Chi LIN (***) (*) Department
More informationLocal cracking stability analysis of super high arch dam *Peng Lin 1), Qingbin Li, Dong Zheng, Senying Hu
Local cracking stability analysis of super high arch dam *Peng Lin 1), Qingbin Li, Dong Zheng, Senying Hu State Key Laboratory of Hydroscience and Engineering, TsinghuaUniversity, Beijing 100084, China
More informationSediment trapping efficiency of modular steel check dam in laboratory experiment and field observation
Sediment trapping efficiency of modular steel check dam in laboratory experiment and field observation Su-Chin CHEN 1, Hiroshi KOKURYO 2, Shuan-Pei AN 1, Sheng-Jui LU 1, and Hui-Kai HUANG 1* 1 Department
More informationRESERVOIR DRAWDOWN RATES/RESERVOIR DRAWDOWN TEST Iron Gate, Copco (I & II), and JC Boyle Dams
TECHNICAL MEMORANDUM No. 1 TO: Michael Bowen California Coastal Conservancy Geotechnical & Earthquake Engineering Consultants CC: Eric Ginney Philip Williams & Associates PREPARED BY: Paul Grant SUBJECT:
More informationFAILURES IN THE AMAZON RIVERBANKS, IQUITOS, PERU
FAILURES IN THE AMAZON RIVERBANKS, IQUITOS, PERU A.Carrillo-Gil University of Engineering & A.Carrillo Gil S.A.,Consulting Engineering,Lima,Peru L. Dominguez University of Engineering,Lima & The Maritime
More informationTechnical Memorandum No
Pajaro River Watershed Study in association with Technical Memorandum No. 1.2.10 Task: Evaluation of Four Watershed Conditions - Sediment To: PRWFPA Staff Working Group Prepared by: Gregory Morris and
More informationAssessment of heterogeneity of an internal structure of an earth-fill embankment with 2-D resistivity survey
Assessment of heterogeneity of an internal structure of an earth-fill embankment with 2-D resistivity survey Peangta Satarugsa, Praiwan Uphatum, Manatchanok Buanark and Sakorn Sangchupoo Department of
More informationHow to Build a Mountain and other Geologic Structures. But first a short review
How to Build a Mountain and other Geologic Structures But first a short review Where do we see deep earthquakes? What is happening there? What can happen at a plate boundary? 1. Plates can move apart
More informationA STUDY ON THE BLASTING VIBRATION CONTROL OF CREEP MASS HIGH SLOPE
A STUDY ON THE BLASTING VIBRATION CONTROL OF CREEP MASS HIGH SLOPE CEN Li, JIANG Cang-ru School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R.China Email: myfqp@tom.com
More informationJune 9, R. D. Cook, P.Eng. Soils Engineer Special Services Western Region PUBLIC WORKS CANADA WESTERN REGION REPORT ON
PUBLIC WORKS CANADA WESTERN REGION REPORT ON GEOTECHNICAL INVESTIGATION PROPOSED MARTIN RIVER BRIDGE MILE 306.7 MACKENZIE HIGHWAY Submitted by : R. D. Cook, P.Eng. Soils Engineer Special Services Western
More informationSPECIFIC DEGRADATION AND RESERVOIR SEDIMENTATION. By Renee Vandermause & Chun-Yao Yang
SPECIFIC DEGRADATION AND RESERVOIR SEDIMENTATION By Renee Vandermause & Chun-Yao Yang Outline Sediment Degradation - Erosion vs Sediment Yield - Sediment Yield - Methods for estimation - Defining Sediment
More informationIV. ENVIRONMENTAL IMPACT ANALYSIS G. GEOLOGY AND SOILS
IV. ENVIRONMENTAL IMPACT ANALYSIS G. GEOLOGY AND SOILS The following section is a summary of the geotechnical report conducted for the proposed project. The Report of Geotechnical Investigation Proposed
More informationUGRC 144 Science and Technology in Our Lives/Geohazards
UGRC 144 Science and Technology in Our Lives/Geohazards Session 3 Understanding Earthquakes and Earthquake Hazards Lecturer: Dr. Patrick Asamoah Sakyi Department of Earth Science, UG Contact Information:
More informationLima Project: Seismic Refraction and Resistivity Survey. Alten du Plessis Global Geophysical
Lima Project: Seismic Refraction and Resistivity Survey Alten du Plessis Global Geophysical Report no 0706/2006 18 December 2006 Lima Project: Seismic Refraction and Resistivity Survey by Alten du Plessis
More informationThe stability of a large slope after impoundment by using 3D numerical modeling at the reservoir
The stability of a large slope after impoundment by using 3D numerical modeling at the reservoir JI-LIANG ZHU, 1 RUN-QIU HUANG 2 & TAO ZHONG 1 1 Guangxi Electric Power Industry Investigation Design and
More informationRESISTIVITY IMAGING AND BOREHOLE INVESTIGATION OF THE BANTING AREA AQUIFER, SELANGOR, MALAYSIA. A.N. Ibrahim Z.Z.T. Harith M.N.M.
JOURNAL OF ENVIRONMENTAL HYDROLOGY The Electronic Journal of the International Association for Environmental Hydrology On the World Wide Web at http://www.hydroweb.com VOLUME 11 2003 RESISTIVITY IMAGING
More informationThe Efficacy of Enhancing Horizontal Resolution (EHR) Technique in Shallow Subsurface Study Using 2D Resistivity Method at Bukit Bunuh
212 International Conference on Geological and Environmental Sciences IPCBEE vol.3 6(212) (212)IACSIT Press, Singapoore The Efficacy of Enhancing Horizontal Resolution (EHR) Technique in Shallow Subsurface
More informationChapter 2: Landslides and Debris Flows
Chapter 2: Landslides and Debris Flows Chapter 2: Landslides and Debris Flows Landslides and debris flows are among the major causes of flash floods in the Himalayan region as the rock, earth, debris,
More information4. The map below shows a meandering stream. Points A, B, C, and D represent locations along the stream bottom.
1. Sediment is deposited as a river enters a lake because the A) velocity of the river decreases B) force of gravity decreases C) volume of water increases D) slope of the river increases 2. Which diagram
More informationDesign of RC Retaining Walls
Lecture - 09 Design of RC Retaining Walls By: Prof Dr. Qaisar Ali Civil Engineering Department UET Peshawar www.drqaisarali.com 1 Topics Retaining Walls Terms Related to Retaining Walls Types of Retaining
More informationLECTURE 10. Module 3 : Field Tests in Rock 3.6 GEOPHYSICAL INVESTIGATION
LECTURE 10 3.6 GEOPHYSICAL INVESTIGATION In geophysical methods of site investigation, the application of the principles of physics are used to the study of the ground. The soil/rock have different characteristics
More informationFlood and Stream Restoration
2 3 4 Pedestrian bridge under construction 3 CSPs perched on DS side Large area of sand deposition Bottom layer of gabions has been scoured out large bar of gabion stone Gabions slumping bank slope failure
More informationFlood Capacity of Shirakawa River at Tatsudajinnnai Area in Kumamoto Prefecture
International Journal of Economy, Energy and Environment 218; 3(5): 51-57 http://www.sciencepublishinggroup.com/j/ijeee doi: 1.11648/j.ijeee.21835.13 ISSN: 2575-513 (Print); ISSN: 2575-521 (Online) Flood
More informationLIQUEFACTION INDUCED GROUND FAILURES CAUSED BY STRONG GROUND MOTION
Paper No. ASOLE LIQUEFACTION INDUCED GROUND FAILURES CAUSED BY STRONG GROUND MOTION Wei F. LEE 1, Kenji ISHIHARA 2, Cheng Hsin CHEN 3, B. L. Chu 4 ABSTRACT During the 1999 Chi-Chi earthquake, a site named
More informationExperimental Study of the Sediment Trap Effect of Steel Grid-Type Sabo Dams
Experimental Study of the Sediment Trap Effect of Steel Grid-Type Sabo Dams Teruyoshi TAKAHARA 1 and Kazuki MATSUMURA 1 1 Graduate school of Agriculture, Kyoto Pref. University (1-5 Shimogamonakaragicyo,
More informationRivers T. Perron
1 Rivers T. Perron 12.001 After our discussions of large-scale topography, how we represent topography in maps, and how topography interacts with geologic structures, you should be frothing at the mouth
More informationWhy Geomorphology for Fish Passage
Channel Morphology - Stream Crossing Interactions An Overview Michael Love Michael Love & Associates mlove@h2odesigns.com (707) 476-8938 Why Geomorphology for Fish Passage 1. Understand the Scale of the
More informationBawakaraeng Urgent Sediment Control Project
Departmen Permukiman Umum Direktorat Jenderal Sumber Daya Air Bawakaraeng Urgent Sediment Control Project (The Most Urgent Components) August 2005 1 The Collapse On March 26, 2004, Mt. Sorongan (EL.2,541m)
More informationGeophysical Investigation of Foundation Condition of A Site in Ikere- Ekiti, Ekiti State, South-Western Nigeria
Australian Journal of Basic and Applied Sciences, 5(9): 1852-1857, 2011 ISSN 1991-8178 Geophysical Investigation of Foundation Condition of A Site in Ikere- Ekiti, Ekiti State, South-Western Nigeria 1
More informationDOWN-HOLE SEISMIC SURVEY AND VERTICAL ELECTRIC SOUNDINGS RABASKA PROJECT, LÉVIS, QUÉBEC. Presented to :
DOWN-HOLE SEISMIC SURVEY AND VERTICAL ELECTRIC SOUNDINGS RABASKA PROJECT, LÉVIS, QUÉBEC Presented to : TERRATECH 455, René-Lévesque Blvd. West Montreal, Québec HZ 1Z3 Presented by : GEOPHYSICS GPR INTERNATIONAL
More informationThe Preliminary Study of Meteorite Impact Crater at Bukit Bunuh, Lenggong
2012 International Conference on Geological and Environmental Sciences IPCBEE vol.3 6(2012) (2012)IACSIT Press, Singapoore The Preliminary Study of Meteorite Impact Crater at Bukit Bunuh, Lenggong A. H.
More informationGeo-hazard Potential Mapping Using GIS and Artificial Intelligence
Geo-hazard Potential Mapping Using GIS and Artificial Intelligence Theoretical Background and Uses Case from Namibia Andreas Knobloch 1, Dr Andreas Barth 1, Ellen Dickmayer 1, Israel Hasheela 2, Andreas
More information5. Crater Rim Uplift and Crater Wall Collapse
5. Crater Rim Uplift and Crater Wall Collapse The basic processes involved in crater rim uplift are understood, but there is a lot of evidence at the crater that has not been fully explored and may eventually
More informationCHANGES IN RIVER BED AROUND THE FUKAWA CONTRACTION AREA BY FLOODS AND CHANNEL IMPROVEMENT WORKS IN THE LOWER TONE RIVER
The 1 th Int. Conf. on Hydroscience and Engineering (ICHE-212), Nov. 4 Nov. 7, Orlando, USA 1 CHANGES IN RIVER BED AROUND THE FUKAWA CONTRACTION AREA BY FLOODS AND CHANNEL IMPROVEMENT WORKS IN THE LOWER
More informationSEISMIC SURVEY METHODS
SEISMIC SURVEY METHODS Seismic methods Seismic surveys are used in geology and geotechnical engineering to: a) define the depth of the bedrock; b) investigate the landslide areas, c) check the structural
More information