Abstract:Based on the unsaturated soil triple-shear strength criterion and the subloading surface model, the Bishop and Fredlund stress-variable method triple-shear subloading surface models for normally consolidated unsaturated clays were constructed and the calculated results of the two models were compared with the results of monotonic static triaxial tests and cyclic dynamic triaxial tests on unsaturated clays. The results show that the Fredlund stress variable model is closer to the test results. In the late stage of soil deformation in the static triaxial test, the deviations of the Fredlund and Bishop stress variable models from the test data were 2% and 10%, respectively; in the late stage of soil vibration in the dynamic triaxial test, the deviations of the Fredlund and Bishop stress variable models from the test results were 4.2% and 7.5%, respectively. In addition, the results of the true triaxial analysis of the proposed models show that the shear strength of the soil increases with the increase of the intermediate principal stress effect factor and the matrix suction in the static true triaxial test, with the deviation of about 11% for each successive simulation result as the matrix suction increases, and with the increase of the intermediate principal stress effect factor, the deviation of about 4% for each successive simulation result. The greater the minimum principal stress or intermediate principal stress in the dynamic triaxial test, the greater the ratchet effect and shear strength of the unsaturated clay. The strain deviation between simulations with different intermediate principal stresses was 3.3% and between simulations with different minimum principal stresses was 8.5%.
胡小荣,蔡晓锋,陈昊,路祥. 非饱和黏性土的三剪次加载面模型研究[J]. 振动与冲击, 2023, 42(7): 194-206.
HU Xiaorong, CAI Xiaofeng, CHEN Hao, LU Xiang. Three-shear sub-loading surface model of unsaturated clay. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(7): 194-206.
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