Reasonable selection of yield criteria for quantitative analysis of unsaturated soil slope stability Reasonable selection of yield criteria for quantitative analysis of unsaturated soil slope stability

最小化 最大化

Vol13 No.7: 1304-1312

Title】Reasonable selection of yield criteria for quantitative analysis of unsaturated soil slope stability

Author】LIU Zi-zhen1,2; YAN Zhi-xin2; REN Zhi-hua2,3; QIU Zhan-hong1; DUAN Jian2

Addresses】1 School of Civil Engineering and Architecture, Taizhou University, Taizhou 318000, China; 2 School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China; 3 Yunnan Province Highway Science and Technology Research Institute, Kunming 650051, China

Corresponding author】yzx10@163.com

Citation】Liu ZZ, Yan ZX, Ren ZH, et al. (2016) Reasonable selection of yield criteria for quantitative analysis of unsaturated soil slope stability. Journal of Mountain Science 13(7). DOI:10.1007/s11629-015-3442-9

DOI】10.1007/s11629-015-3442-9

Abstract】The yield criterion parameters of the soil material change with different values of the cohesion and the angle of frictionbecause of sustained rainfall infiltration. Based on the Mohr-Coulomb (M-C) and Drucker-Prager (D-P) yield criteria, some reasonable yield criteria selections were discussed for quantitative analysis of unsaturated soil slope stability. Moreover, a critical point was found at the effective angle of friction equaling to 16.5° by transformation of parameters related to unsaturated soil under sustained rainfall. When the effective angle of friction more than 16.5°through parameter transformation of different yield criteria under natural condition, the calculation result of the safety factor was such that: f(DP1) > f(M-C) > f(equivalent M-C) > f(DP2) > f(DP3). While the effective angle of friction less than 16.5° , through parameter transformation, the safety factors were in the following order: f(DP1) > f(M-C) > f(DP2) > f(equivalent M-C) > f(DP3). The calculated results from a case study showed that the equivalent M-C yield criterion should be the best at evaluating soil slope stability before rainfall; the DP2 yield criterion should be selected to calculate the soil slope stability at the effective angle of friction less than 16.5°under sustained rainfall. The yield criterion should be selected or adjusted reasonably to calculate the safety factor of unsaturated soil slopes before and during sustained rainfall.

Keywords】Unsaturated soil slope; Yield criteria; Parameter transformation; Rainfall; Safety factor