横向拖拽式滑坡形成机制及三维稳定性评价研究

doi:10.13722/j.cnki.jrme.2022.0457

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摘要以四川省南充市仪陇县峰岩村滑坡为典型案例，在详细的野外调查和力学分析的基础上，提出一种新的红层区岩质滑坡破坏类型–横向拖拽式滑坡。该类滑坡在强降雨作用下，主滑体在运动过程中克服边界接触带上岩体抗剪强度，产生顺滑动方向的拖拽力，造成两侧坡体发生拖拽变形；滑坡体纵向长度小于横向宽度，且在地表垂直于滑动方向上呈现明显的强、弱变形区。首先系统研究并查明拖拽式滑坡发生必须具备的坡体结构条件、岩性组成条件、临空条件和外界触发条件。然后在对滑坡体进行全面受力分析的基础上，建立起主滑体和拖拽体三维稳定性分析评价模型和失稳判据。最后，针对横向拖拽式滑坡的防治，提出以地表排水和地下水疏浚为主，并辅以适当支挡工程的治理建议。研究成果对红层滑坡防治具有一定的指导意义。

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	李江1
	2
	许强1
	张继2
	杨晓东2
	唐然3
	李达山4
	吴宁安2
	闫开云2

关键词 ：边坡工程, 拖拽式滑坡, 形成机制, 三维稳定性评价, 防治措施

Abstract：A new type of rock landslide failure mode in red bed area，lateral drag landslide，is proposed after detailed field investigation and mechanics analysis of Fengyan village landslide in Yilong County，Nanchong City，Sichuan Province. During the movement of the main sliding body of the landslide in the heavy rain，the dragging force will be generated along the sliding direction of the contact zone of the boundary on both sides，which will lead to the dragging deformation of the slope on both sides. The longitudinal length of landslide is smaller than the transverse width and the surface lateral deformation shows obvious strong and weak zones. Firstly，the slope structure conditions，lithologic composition conditions，free face conditions and external triggering conditions which must be had for the occurrence of the drag landslide are systematically studied and identified. Then on the basis of the comprehensive force analysis of landslide，the three-dimensional stability evaluation model and criterion of main sliding body and dragging body are established. Finally，in order to prevent the subsequent deformation and failure mode of the drag landslide，the paper puts forward some suggestions on surface drainage and groundwater dredging，supplemented by appropriate retaining engineering. The research findings have certain guiding significance for the prevention and control of red bed landslide.

Key words： slope engineering drag landslide formation mechanism three-dimensional stability evaluation prevention measures

引用本文:

李江1，2，许强1，张继2，杨晓东2，唐然3，李达山4，吴宁安2，闫开云2. 横向拖拽式滑坡形成机制及三维稳定性评价研究[J]. 岩石力学与工程学报, 2023, 42(S2): 4152-4161.
LI Jiang1，2，XU Qiang1，ZHANG Ji2，YANG Xiaodong2，TANG Ran3，LI Dashan4，WU Ningan2，YAN Kaiyun2. Study on formation mechanism and three-dimensional stability evaluation of lateral drag landslide. , 2023, 42(S2): 4152-4161.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0457 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4152

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