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基于孔隙连通-迂曲参数表征土的非饱和渗透各向异性

张昭, 刘奉银, 齐吉琳, 柴军瑞, 王爽, 李会勇, 高永宝

张昭, 刘奉银, 齐吉琳, 柴军瑞, 王爽, 李会勇, 高永宝. 基于孔隙连通-迂曲参数表征土的非饱和渗透各向异性[J]. 岩土工程学报, 2018, 40(S1): 147-152. DOI: 10.11779/CJGE2018S1024
引用本文: 张昭, 刘奉银, 齐吉琳, 柴军瑞, 王爽, 李会勇, 高永宝. 基于孔隙连通-迂曲参数表征土的非饱和渗透各向异性[J]. 岩土工程学报, 2018, 40(S1): 147-152. DOI: 10.11779/CJGE2018S1024
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ZHANG Zhao, LIU Feng-yin, QI Ji-lin, CHAI Jun-rui, WANG Shuang, LI Hui-yang, GAO Yong-bao. Represention of anisotropy in unsaturated permeabilities for soils based on pore connectivity-tortuosity parameter[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 147-152. DOI: 10.11779/CJGE2018S1024
Citation: ZHANG Zhao, LIU Feng-yin, QI Ji-lin, CHAI Jun-rui, WANG Shuang, LI Hui-yang, GAO Yong-bao. Represention of anisotropy in unsaturated permeabilities for soils based on pore connectivity-tortuosity parameter[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 147-152. DOI: 10.11779/CJGE2018S1024
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基于孔隙连通-迂曲参数表征土的非饱和渗透各向异性  English Version

  • 1. 西安理工大学岩土工程研究所,陕西 西安 710048;
    2. 北京建筑大学土木与交通工程学院,北京 100044;
    3. 省部共建西北旱区生态水利国家重点实验室（西安理工大学）,陕西 西安 710048;
    4. 三峡大学水利与环境学院,湖北 宜昌 443002;
    5. 中国水电基础局有限公司,天津 301700;
    6. 中交第一公路勘察设计研究院有限公司,陕西 西安 710065

基金项目: 国家自然科学基金项目（41402258,41372304,51679198）; 中国博士后科学基金资助项目（2015M572657XB）; 陕西省自然科学基础研究计划-青年人才项目（2016JQ4002）; 陕西省博士后科研项目（107-434016007）; 陕西省“百人计划”项目（302-253051601）
详细信息
    作者简介:

    张 昭(1983- ),男,陕西西安人,博士,副教授,主要从事非饱和土水力特性的研究工作。E-mail：zhangzhao_1983@126.com。

    通讯作者:

    刘奉银，E-mail：liufy@xaut.edu.cn

  • 中图分类号: TU43

Represention of anisotropy in unsaturated permeabilities for soils based on pore connectivity-tortuosity parameter

  • 1. Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China;
    2. College of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
    3. State Key Laboratory Base of Eco-hydraulics in Northwest Arid Region of China (Xi'an University of Technology), Xi'an 710048, China;
    4. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China;
    5. Sinohydro Foundation Engineering Co., Ltd., Tianjin 301700, China;
    6. CCCC First Highway Consultants Co., Ltd., Xi'an 710065, China

摘要

    摘要
  • 摘要: 合理描述土的非饱和渗透各向异性对模拟土体内水分和污染物的迁移至关重要。基于Mualem提出的非饱和渗透系数函数引入的孔隙连通-迂曲参数,推得非饱和渗透各向异性系数关于有效饱和度的幂函数表达式,并根据该表达式将土的非饱和渗透各向异性划分为9种类型,发现各向异性系数随有效饱和度的变化过程中会出现土孔隙内水分主导流动方向变化的门槛点;再利用已有文献中基于孔隙网络模型模拟土样的非饱和渗透数值试验结果验证了该表达式的有效性;最后,将该表达式与Van Genuchten-Mualem函数相结合,定量描述了基质吸力对已有文献中4种土的非饱和渗透各向异性影响。
    Abstract: Accurate characterization of the anisotropy in unsaturated permeability for soils is significant in simulating flow and contaminant transport. Based on the Mualem’s unsaturated permeability function, the power type expression for the relationship between the anisotropy coefficient and the effective degree of saturation is derived by introducing the pore connectivity-tortuosity parameter so as to describe the nine types of the anisotropy in unsaturated permeability. In the process of anisotropy coefficients varying with the effective degree of saturation, there exists a critical point at which the dominance of flow direction switches. This expression is then validated using the numerical test results of unsaturated permeability of a pore network for modeling the soil samples in the previous literatures. Combining with the Van Genuchten-Mualem function, this expression can be finally used to represent the effect of matric suction on the anisotropy in permeability for four soils in the existing literatures.
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    • 参考文献(20)
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出版历程
  • 收稿日期:  2017-06-10
  • 发布日期:  2018-08-24

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