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Advances in Civil Engineering Volume 2019 ,2019-03-03
Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism
Research Article
Yu Zhang 1 Tielin Chen 1 Yujun Zhang 2 Weizhong Ren 2
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DOI:10.1155/2019/6034526
Received 2018-09-28, accepted for publication 2019-01-01, Published 2019-01-01
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摘要

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.

授权许可

Copyright © 2019 Yu Zhang et al. 2019
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

通讯作者

Yu Zhang.Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China, njtu.edu.cn.zhangyu871030@163.com

推荐引用方式

Yu Zhang,Tielin Chen,Yujun Zhang,Weizhong Ren. Calculation Methods of Seepage Coefficient for Clay Based on the Permeation Mechanism. Advances in Civil Engineering ,Vol.2019(2019)

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