Permeability evolution of compacted clay during triaxial compression
Triaxial seepage tests were conducted on the core-wall clay of a high rock-fill dam to investigate the change of hydraulic conductivity with axial strain. It was found that the compaction density and confining pressure were the two main factors influencing the change of hydraulic conductivity during...
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| Format: | Article |
| Language: | English |
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SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717
2020-01-01
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| Series: | Rock and Soil Mechanics |
| Subjects: | |
| Online Access: | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2018.7135 |
| _version_ | 1811303907621601280 |
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| author | WANG Gang WEI Lin-yi WEI Xing ZHANG Jian-min |
| author_facet | WANG Gang WEI Lin-yi WEI Xing ZHANG Jian-min |
| author_sort | WANG Gang |
| collection | DOAJ |
| description | Triaxial seepage tests were conducted on the core-wall clay of a high rock-fill dam to investigate the change of hydraulic conductivity with axial strain. It was found that the compaction density and confining pressure were the two main factors influencing the change of hydraulic conductivity during triaxial compression. When the current confining pressure was greater than the pre-consolidation pressure of a compacted specimen, the specimen kept being compressed and became denser during the compression process, resulting in a decreasing trend in its hydraulic conductivity until it eventually reached a stable state. On the other hand, if the current confining pressure was far less than the pre-consolidation pressure of the specimen, the specimen deformed in a localized shear band which weakened the impermeability of the specimen, and as the shear band continued to dilate, an increasing trend in the overall hydraulic conductivity was observed. This study highlighted an important fact that heavily compacted clay under low confining pressures had a high susceptibility to localized shear bands of high permeability, which could be used to explain many historical leakage problems observed in clay-core dams. |
| first_indexed | 2024-04-13T07:56:30Z |
| format | Article |
| id | doaj.art-02a7fe752d1a4862876c379da9b063de |
| institution | Directory Open Access Journal |
| issn | 1000-7598 |
| language | English |
| last_indexed | 2024-04-13T07:56:30Z |
| publishDate | 2020-01-01 |
| publisher | SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717 |
| record_format | Article |
| series | Rock and Soil Mechanics |
| spelling | doaj.art-02a7fe752d1a4862876c379da9b063de2022-12-22T02:55:23ZengSCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717Rock and Soil Mechanics1000-75982020-01-01411323810.16285/j.rsm.2018.7135Permeability evolution of compacted clay during triaxial compressionWANG Gang0WEI Lin-yi1WEI Xing2ZHANG Jian-min31. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China ;2. National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing University, Chongqing 400045, ChinaSchool of Civil Engineering, Chongqing University, Chongqing 400045, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, ChinaSchool of Civil Engineering, Tsinghua University, Beijing 100084, ChinaTriaxial seepage tests were conducted on the core-wall clay of a high rock-fill dam to investigate the change of hydraulic conductivity with axial strain. It was found that the compaction density and confining pressure were the two main factors influencing the change of hydraulic conductivity during triaxial compression. When the current confining pressure was greater than the pre-consolidation pressure of a compacted specimen, the specimen kept being compressed and became denser during the compression process, resulting in a decreasing trend in its hydraulic conductivity until it eventually reached a stable state. On the other hand, if the current confining pressure was far less than the pre-consolidation pressure of the specimen, the specimen deformed in a localized shear band which weakened the impermeability of the specimen, and as the shear band continued to dilate, an increasing trend in the overall hydraulic conductivity was observed. This study highlighted an important fact that heavily compacted clay under low confining pressures had a high susceptibility to localized shear bands of high permeability, which could be used to explain many historical leakage problems observed in clay-core dams.http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2018.7135triaxial seepage testhydraulic conductivitystrain localizationshear-induced leakage band |
| spellingShingle | WANG Gang WEI Lin-yi WEI Xing ZHANG Jian-min Permeability evolution of compacted clay during triaxial compression Rock and Soil Mechanics triaxial seepage test hydraulic conductivity strain localization shear-induced leakage band |
| title | Permeability evolution of compacted clay during triaxial compression |
| title_full | Permeability evolution of compacted clay during triaxial compression |
| title_fullStr | Permeability evolution of compacted clay during triaxial compression |
| title_full_unstemmed | Permeability evolution of compacted clay during triaxial compression |
| title_short | Permeability evolution of compacted clay during triaxial compression |
| title_sort | permeability evolution of compacted clay during triaxial compression |
| topic | triaxial seepage test hydraulic conductivity strain localization shear-induced leakage band |
| url | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2018.7135 |
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