Hydro-mechanical double-yield-surface model for unsaturated sand and clay
LI Jian1, LIU Kai2, YIN Zhen-yu2, CUI Yu-jun3, YIN Jian-hua2
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; 2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China; 3. Ecole des Ponts ParisTech, Laboratoire Navier/CERMES, Paris, France
Abstract：Hydro-mechanical coupling behavior analysis with a sophisticated model for both unsaturated sand and clay is still a challenge. In this study, a hydro-mechanical coupling model with two plastic deformation mechanisms, i.e., loading collapse and shear sliding, for unsaturated soils is formulated using the Bishop’s stress as the stress variable and using the void ratio and the effective degree of saturation as the state variables. An expression for the critical state line related to the effective degree of saturation in the void ratio-soil skeleton stress semilog plane is explicitly implemented, which is combined with a non-associated flow rule for the shear sliding yield surface to guarantee the satisfactory simulation of the dilation or contraction during shear for unsaturated soils including sand and clay. The predictive capability of the model to reproduce the main features of unsaturated soil behavior is analyzed by simulating the triaxial tests on silty sand and kaolin.
李舰, 刘凯, 尹振宇, 崔玉军, 殷建华. 非饱和砂土及黏土的水-力耦合双屈服面模型[J]. 岩土工程学报, 2020, 42(1): 72-80.
LI Jian, LIU Kai, YIN Zhen-yu, CUI Yu-jun, YIN Jian-hua. Hydro-mechanical double-yield-surface model for unsaturated sand and clay. Chinese J. Geot. Eng., 2020, 42(1): 72-80.
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