直线型复合式滑坡渐进破坏力学模型及稳定性研究

doi:10.13722/j.cnki.jrme.2020.0594

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摘要复合式滑坡防治难点在于稳定性状态判定及关键防治部位的识别。以直线型复合式滑坡为例，从其渐进破坏力学过程角度，研究滑坡稳定性状态的判定方法和关键防治部位的识别。首先针对概化的滑坡地质结构模型，基于应变软化理论建立渐进破坏力学模型；随后，提出破坏过程的五阶段划分模式，并在静力平衡原理上对各阶段构建了滑坡的稳定性状态方程。所建力学模型与稳定性状态方程体现了该类滑坡演化过程中等效荷载、应力分布、变形特征及稳定性间的变化规律，揭示了滑坡由两端向中部软化、由局部到整体失稳的渐进破坏特征，据此可有效判定滑坡稳定性状态。实例研究表明，滑坡稳定性的衰减幅度随渐进破坏的发展而增大。若2个破坏区的长度不同，则较短区的稳定性衰减速度大于较长区，且当两端滑带开始剪切时，较长区承担的等效荷载大于较短区，可见较短区为该类滑坡的关键防治部位。研究具有一定的理论意义与应用价值。

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	杜毅
	晏鄂川
	蔡静森
	周游
	王纪云

关键词 ：边坡工程, 直线型复合式滑坡, 破坏模式, 渐进破坏, 力学模型, 稳定性

Abstract：The difficulties of complex landslide control lie in the determination of stability and the identification of key control parts. Taking a linear complex landslide as an example，in this paper，the method for determining the stability state and the identification of key control parts of the landslide are studied from the perspective of progressive failure process. First of all，aiming at the generalized geological structure model of the landslide，a progressive failure mechanical model is established based on the strain-softening theory. Subsequently，a five-stage division model of the progressive failure process is proposed，and the stability state equations of the landslide are constructed for each stage based on the static balance principle. The mechanical model and stability state equations reflect the changing laws of equivalent load，stress distribution，deformation characteristics and stability during the evolution of this type of landslide，and reveal the progressive failure characteristics of the landslide，involving softening from both ends to the middle and losing stability from the local to the whole. Based on this，the stability state of the landslide can be effectively determined. A case study shows that the attenuation amplitude of the landslide stability increases with the development of progressive failure. If the lengths of the two destruction zones are different，the attenuation rate of the stability of the shorter zone is greater than that of the longer zone. In addition，when the sliding bands at both ends start to shear，the equivalent load of the longer zone is greater than that of the shorter zone，showing that the shorter zone is the key control part of this type of landslide. The research has certain theoretical significance and application value.

Key words： slope engineering')" href="#">

slope engineering linear complex landslide failure model progressive failure mechanical model ')" href="#">stability

引用本文:

杜毅，晏鄂川，蔡静森，周游，王纪云. 直线型复合式滑坡渐进破坏力学模型及稳定性研究[J]. 岩石力学与工程学报, 2021, 40(3): 490-502.
DU Yi，YAN Echuan，CAI Jingsen，ZHOU You，WANG Jiyun. A mechanical model of progressive failure of linear complex landslides. , 2021, 40(3): 490-502.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0594 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I3/490

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