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Volume 40 Issue S1
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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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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

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  • Received Date: June 10, 2017
  • Published Date: August 24, 2018
    Graphical Abstract
    • 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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    • References (20)
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