考虑膨胀作用对抗剪强度影响的膨胀土边坡稳定性分析

doi:10.13722/j.cnki.jrme.2021.0869

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Abstract 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.

Key words： slope engineering swelling shear strength slope stability constrained condition the critical strain

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	HE Weiming1
	2
	SHI Shengwei1
	2
	CAI Qiang1
	2
	LIANG Jiong1
	2

Cite this article:

HE Weiming1,2,SHI Shengwei1, et al. Stability analysis of expansive soil slope considering the influence of swelling on shear strength[J]. , 2022, 41(S2): 3524-3533.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0869 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3524

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