Stability analysis of expansive soil slope considering the influence of swelling on shear strength

被引：0
|
作者：
He W. [1 ,2 ]
Shi S. [1 ,2 ]
Cai Q. [1 ,2 ]
Liang J. [1 ,2 ]
机构：
[1] Institute of Exploration Technology, Chinese Academy of Geological Sciences, Sichuan, Chengdu
[2] Technical Center for Geological Hazard Prevention and Control, China Geological Survey, Sichuan, Chengdu
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷
关键词：
constrained condition; shear strength; slope engineering; slope stability; swelling; the critical strain;
D O I：
10.13722/j.cnki.jrme.2021.0869
中图分类号：
学科分类号：
摘要：
Swelling is one of the key factors affecting the stability of expansive soil slope. At present，the assumption of expansive force is insufficient and the mechanism is not clear when analyzing the stability of expansive soil slope. In response to these problems，the multidirectional swelling under specific constraints and its influence on shear strength are being considerd based on the Morgenstern-Price limit equilibrium method，and a project is taken as an example to illustrate the calculated process，which also is used to analysis the influence of swelling and residual shear strength on the stability of expansive soil slope. The results of the study presented in this paper show that constrained condition play a significant effect on the swelling pressure，which will be markedly reduced when there is a micro gap. The calculated swelling pressure of the slope presents a“trapezoidal”distribution，which transform the shear strength into residual strength when it causes the swelling strain exceeds the critical strain，and there is a critical swelling pressure，which makes the stability coefficient of the expansive soil slope suddenly change. The residual shear strength has dual effects on the stability of expansive soil slope，on the one hand，which affects the position with respect to the junction of residual and non residual area，and the other is the direct impact as a mechanical parameter for slope stability calculation. The research of the study are provided for reference for further improving the calculated theory of expansive soil slope stability and carrying out the research on corresponding engineering prevention measures. © 2022 Academia Sinica. All rights reserved.
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页码：3524 / 3533
页数：9
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