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Volume 40 Issue S1
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GAO Deng-hui, CHEN Zheng-han, XING Yi-chuan, GUO Nan, DENG Gang, HU Sheng-xia. Influence of net mean stress on permeability coefficient of unsaturated remolded loess[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 51-56. DOI: 10.11779/CJGE2018S1009
Citation: GAO Deng-hui, CHEN Zheng-han, XING Yi-chuan, GUO Nan, DENG Gang, HU Sheng-xia. Influence of net mean stress on permeability coefficient of unsaturated remolded loess[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 51-56. DOI: 10.11779/CJGE2018S1009
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Influence of net mean stress on permeability coefficient of unsaturated remolded loess

  • 1. Geotechnical Engineering Institute, China Institute of Water Resources and Hydropower Research, Beijing 100048, China;
    2. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
    3. Department of Military Installation, Army Service University, Chongqing 401311, China;
    4. School of Architectural and Civil Engineering, Yan'an University, Yan'an 716000, China

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  • Received Date: June 10, 2017
  • Published Date: August 24, 2018
    Graphical Abstract
    • Abstract
  • In order to study the influence of the net mean stress on the permeability coefficient of unsaturated remolded loess, an indirect method is used to predict the permeability coefficient through the generalized soil water characteristic curve which involves the effect of net mean stress on SWCC. To get the generalized soil water characteristic curve, four triaxial contraction tests are conducted for remolded loess samples by increasing matrix suction step by step and controlling the net mean stress as constant. Based on the measured generalized soil water characteristic curve, the Van Genuchten model for predicting the permeability coefficient of unsaturated soil is used. The permeability coefficient of every matrix suction under different net mean stresses is calculated. The results show that the permeability coefficient of unsaturated remolded loess decreases nonlinearly with the increase of the matrix suction in the semi-log coordinates. Under the same matrix suction, the smaller the net mean stress, the greater the permeability coefficient. The results may provide a useful basis for the deformation of high embankment and rainfall infiltration of slope stability evaluation in loess regions.
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    • References (13)
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