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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摘要膨胀作用是影响膨胀土边坡稳定性的关键因素之一。针对目前膨胀土边坡稳定性分析中膨胀力假设依据不充分、作用机制不明晰等问题，基于Morgenstern-Price边坡稳定分析极限平衡法，考虑特定约束条件下的多向膨胀作用及其对土体抗剪强度的影响，分析膨胀土边坡的稳定性，并以某工程为例说明计算过程，同时分析膨胀作用及残余抗剪强度对边坡稳定性的影响。结果表明：约束条件对膨胀力具有显著影响，当单向存在微小约束间隙时，该向膨胀力将明显降低；边坡计算膨胀力呈“梯形”分布，当其作用促使膨胀应变超过临界应变时，土体抗剪强度将转化为残余强度，且存在临界膨胀力，使膨胀土边坡稳定系数在该处发生突变。残余抗剪强度对膨胀土边坡的稳定性具有双重影响：影响了残余区与非残余区交界点的位置；以及作为边坡稳定性计算的力学参数所带来的直接影响。研究成果可为进一步完善膨胀土边坡稳定性计算理论，并开展相应工程防治措施研究提供参考。

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关键词 ：边坡工程, 膨胀作用, 抗剪强度, 边坡稳定性, 约束条件, 临界应变

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

引用本文:

贺伟明1，2，石胜伟1，2，蔡强1，2，梁炯1，2. 考虑膨胀作用对抗剪强度影响的膨胀土边坡稳定性分析[J]. 岩石力学与工程学报, 2022, 41(S2): 3524-3533.
HE Weiming1，2，SHI Shengwei1，2，CAI Qiang1，2，LIANG Jiong1，2. Stability analysis of expansive soil slope considering the influence of swelling on shear strength. , 2022, 41(S2): 3524-3533.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0869 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3524

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