Stability charts for undrained clay slopes considering soil anisotropic characteristics

被引：0
作者：
Yongqin Li
ATC Goh
Runhong Zhang
Wengang Zhang
机构：
[1] Chongqing University,Key Laboratory of New Technology for Construction of Cities in Mountain Area
[2] Chongqing University,School of Civil Engineering
[3] National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas,School of Civil and Environmental Engineering
[4] Chongqing University,undefined
[5] Nanyang Technological University,undefined
来源：
Bulletin of Engineering Geology and the Environment | 2023年 / 82卷
关键词：
Finite element analysis; Undrained clay slope; Stability chart; Stress-induced anisotropy;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
It is generally recognized that the stress-induced anisotropy of undrained cohesive soil has a significant influence on the factor of safety of slopes. In this study, a simplified method is proposed to evaluate the slope stability considering soil anisotropic shear strength. An advanced constitutive model is used to characterize the anisotropic behavior of strength and stiffness of cohesive soil caused by the rotation of principal stress direction. A series of finite element analysis is carried out using the strength reduction method to calculate the safety factor of the undrained clay slope. The stability chart developed by Taylor (1937) has been adapted to take into consideration the anisotropic conditions of the clay slope. The stability number and failure modes of undrained clay slopes with different geometries and depths to hard stratum can be quickly assessed using the proposed design charts. Additionally, the feasibility of replacing complex anisotropy analysis with average isotropic constant undrained strength is discussed. Different suggestions are proposed for gentle and steep slopes. Findings of the present study can be a helpful supplement to the existing slope stability assessment for unreinforced undrained clay slopes.
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