考虑旋转各向异性相关结构的黏土边坡稳定性分析

doi:10.13722/j.cnki.jrme.2017.0044

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摘要

目前考虑土性参数空间变异性对边坡稳定性的研究主要集中在各向同性和横观各向同性相关结构方面，针对这一不足，开展了旋转各向异性相关结构对黏土边坡稳定性的影响研究。基于随机场理论，采用协方差矩阵分解法，建立旋转各向异性相关结构的随机场模型，与数值分析手段相结合进行边坡可靠度研究。结果表明：与横观各向同性相关结构相比，旋转各向异性相关结构对边坡稳定性的影响表现为两面性，并且这种两面性随各向异性系数的增加表现得越明显；随机分析中计算得到的安全系数均值小于确定性分析结果，安全系数变异系数也小于随机模型中不排水抗剪强度的变异系数；计算模拟得到了3种边坡滑面形式，其中坡底滑动所占比例最高。

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	程红战1
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关键词 ：边坡工程, 边坡稳定性, 空间变异性, 旋转各向异性, 随机场, 滑面

Abstract：

Currently the studies of slope stability accounting for the spatial variability of soil properties are mainly concentrated on isotropy and transverse isotropy correlation structures. Considering the disadvantage，the influence of the rotated anisotropy correlation structure on clay slope was investigated in this paper. Based on random field theory，the rotated anisotropy random fields of soil parameters are simulated and set up using the covariance matrix decomposition method. Combining with the numerical approach，slope reliability was then explored. The results show that the rotated anisotropy correlation structure has a dual effect on slope stability in comparison to the transverse isotropy case，and the stronger effect for higher anisotropy. The mean of factor of safety obtained by stochastic analysis is less than the deterministic solution. The calculated coefficient of variation of factor of safety is less than that of undrained shear strength of clay. Three types of sliding surfaces are obtained，and the largest proportion occurring is the base sliding which is same as the deterministic results.

Key words： slope engineering slope stability spatial variability rotated anisotropy random field sliding surface

引用本文:

程红战1，2，陈健1，2，王占盛3，胡之锋1，2，黄珏皓1，2. 考虑旋转各向异性相关结构的黏土边坡稳定性分析[J]. 岩石力学与工程学报, 2017, 36(S2): 3965-3973.
CHENG Hongzhan1，2，CHEN Jian1，2，WANG Zhansheng3，HU Zhifeng1，2，HUANG Juehao1，2. Stability analysis of a clay slope accounting for the rotated anisotropy correlation structure. , 2017, 36(S2): 3965-3973.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0044 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3965

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