Effect of Statistically Anisotropic Undrained Shear Strength on the Probability of Slope Failure

Water

卷:14

Weiya Ge¹  Cheng Yu¹  Menglong Dong²  Xiaolan Hou²  Zinan Li²  Yukun Li²  Faming Zhang² 

[1] China Geological Survey Nanjing Center, Nanjing 210016, China;

[2] School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China;

关键词: probability of slope failure;    Monte Carlo simulation;    undrained shear strength;    statistically anisotropic parameters;    failure mechanism;   

DOI  :  10.3390/w14081225

来源: DOAJ

【 摘 要 】

Due to large-scale geological deposition processes, slope structures are often stratified, which means that the spatial distribution of the parameters involved in slope reliability evaluation is statistically anisotropic. This paper studies the effect of the statistical anisotropy of undrained shear strength on the probability of slope failure (p_f) based on the Monte Carlo simulation. The results show that for the horizontally layered slope, the larger the horizontal correlation scale of undrained shear strength (λ_x) is, the larger p_f is, especially when λ_x is smaller than the slope length; for the vertically layered slope, the larger the vertical correlation scale (λ_y) is, the smaller p_f is, especially when λ_y is smaller than the slope height. Additionally, the mechanism of the above results is discussed by analyzing the displacement distribution at different correlation scales. The findings indicate that in the reliability evaluation of undrained slopes in stratified structures, either underestimation of λ_x or overestimation of λ_y leads to an unconservative estimate of p_f, resulting in an overestimation of the slope stability.

【 授权许可】

Unknown