Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism
The existing empirical methods of the seepage coefficient for clay have difficulty in parameter acquisition and are poor in calculation accuracy, and it is possible to find reasonable ones based on the mature empirical methods of coarse-grained soil. Firstly, the permeation mechanism of clay was ana...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/6034526 |
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| _version_ | 1849397571127083008 |
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| author | Yu Zhang Tielin Chen Yujun Zhang Weizhong Ren |
| author_facet | Yu Zhang Tielin Chen Yujun Zhang Weizhong Ren |
| author_sort | Yu Zhang |
| collection | DOAJ |
| description | The existing empirical methods of the seepage coefficient for clay have difficulty in parameter acquisition and are poor in calculation accuracy, and it is possible to find reasonable ones based on the mature empirical methods of coarse-grained soil. Firstly, the permeation mechanism of clay was analysed including influencing factors, spatial process, and parameter calculation, and the ineffective and effective voids were defined; then the empirical methods of clay and coarse-grained soil were summarised and listed. Secondly, clay was put equivalent to coarse-grained soil according to bound-water consolidation, and the parameter “equivalent void ratio” was introduced to establish the equivalent calculation methods. Finally, the liquid-plastic limit method determining the volume of ineffective voids was explained, and the feasibility of equivalent calculation methods was evaluated by three examples. The results show that seepage, permeation, and effective permeation are three different concepts; groundwater permeates in clay via the effective void. For certain soil, the increasing sequence of permeability coefficients is the seepage coefficient, permeation coefficient, and effective permeation coefficient. Introduction of the “equivalent void ratio” unifies the calculation of the seepage coefficient for clay and coarse-grained soil. The maximum of the bound-water content is about 0.9 time the size of liquid limit. The Mesri equation and the equivalent calculation method of Terzaghi or Curson–Karman are suitable for calculating the seepage coefficient of clay for the closest results to experimental values. |
| format | Article |
| id | doaj-art-ac87389cf4a646598974fe5ff334202c |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-ac87389cf4a646598974fe5ff334202c2025-08-20T03:38:56ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/60345266034526Calculation Methods of Seepage Coefficient for Clay Based on the Permeation MechanismYu Zhang0Tielin Chen1Yujun Zhang2Weizhong Ren3Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, ChinaKey Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, ChinaWuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaWuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaThe existing empirical methods of the seepage coefficient for clay have difficulty in parameter acquisition and are poor in calculation accuracy, and it is possible to find reasonable ones based on the mature empirical methods of coarse-grained soil. Firstly, the permeation mechanism of clay was analysed including influencing factors, spatial process, and parameter calculation, and the ineffective and effective voids were defined; then the empirical methods of clay and coarse-grained soil were summarised and listed. Secondly, clay was put equivalent to coarse-grained soil according to bound-water consolidation, and the parameter “equivalent void ratio” was introduced to establish the equivalent calculation methods. Finally, the liquid-plastic limit method determining the volume of ineffective voids was explained, and the feasibility of equivalent calculation methods was evaluated by three examples. The results show that seepage, permeation, and effective permeation are three different concepts; groundwater permeates in clay via the effective void. For certain soil, the increasing sequence of permeability coefficients is the seepage coefficient, permeation coefficient, and effective permeation coefficient. Introduction of the “equivalent void ratio” unifies the calculation of the seepage coefficient for clay and coarse-grained soil. The maximum of the bound-water content is about 0.9 time the size of liquid limit. The Mesri equation and the equivalent calculation method of Terzaghi or Curson–Karman are suitable for calculating the seepage coefficient of clay for the closest results to experimental values.http://dx.doi.org/10.1155/2019/6034526 |
| spellingShingle | Yu Zhang Tielin Chen Yujun Zhang Weizhong Ren Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism Advances in Civil Engineering |
| title | Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism |
| title_full | Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism |
| title_fullStr | Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism |
| title_full_unstemmed | Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism |
| title_short | Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism |
| title_sort | calculation methods of seepage coefficient for clay based on the permeation mechanism |
| url | http://dx.doi.org/10.1155/2019/6034526 |
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