Study on the mechanism of typical rainfall induced accumulation layer landslide

YE Xuguang; WANG Xingang; LIU Kai; WANG Youlin; LUO Li; XUE Chen

doi:10.16152/j.cnki.xdxbzr.2024-01-012

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Study on the mechanism of typical rainfall induced accumulation layer landslide

Engineering Geological Disasters | 更新时间：2024-01-18

- Study on the mechanism of typical rainfall induced accumulation layer landslide
- Journal of Northwest University (Natural Science Edition) Vol. 54, Issue 1, Pages: 101-110(2024)
- 作者机构：
  
  1.西北大学　地质学系/大陆动力学国家重点实验室，陕西　西安　710069
  2.陕西省水工环地质调查中心，陕西　西安　710068
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2024-01-012
  CLC：
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YE Xuguang, WANG Xingang, LIU Kai, et al. Study on the mechanism of typical rainfall induced accumulation layer landslide. [J]. Journal of Northwest University (Natural Science Edition) 54(1):101-110(2024)
DOI：

YE Xuguang, WANG Xingang, LIU Kai, et al. Study on the mechanism of typical rainfall induced accumulation layer landslide. [J]. Journal of Northwest University (Natural Science Edition) 54(1):101-110(2024) DOI： 10.16152/j.cnki.xdxbzr.2024-01-012.

摘要

以柞水县小岭镇罗庄三组滑坡为研究对象，在野外地质调查的基础上开展室内土工试验，利用大型直剪试验和数值模拟手段，研究不同含水率条件下滑带土的剪切力学特性，进而在此基础上揭示降雨诱发堆积层滑坡的形成机理和变形过程。大型直剪试验表明：在试验前期，剪切应力与剪切位移呈线性关系，随剪切位移增大曲线呈现出非线性特征；在其他试验工况相同时，剪切应力与含水率呈负相关规律；当含水率相同时，剪切应力随法向荷载的增大而增大。数值模拟结果表明：堆积层坡体在降雨因素的作用下，容易发生失稳；随着降雨强度和时长的不断增大，土体含水量增加或饱和后易产生破坏，坡体稳定性系数不断减小。降雨条件下，堆积层滑坡滑体变形较强烈，其变形过程一般经历蠕动变形→加速变形→滑动破坏3个阶段，破坏运动形式以推移式为主，通过推挤作用对威胁对象产生破坏效应，从而造成人员和财产损失。该研究成果对秦巴山区堆积层滑坡的机理研究与防灾减灾具有一定的参考意义。

Abstract

The Luozhuang Group 3 landslide in Xiaoling Town, Zhashui County, is the focus of the present study.Geotechnical tests are performed indoors based on the geological survey in the field. By means of large-scale direct shear test and numerical simulation, the shear mechanical properties of sliding zone soil under different water content conditions are analyzed and studied. On this basis, the formation mechanism and deformation process of rainfall-induced accumulation landslide are revealed. The large-scale direct shear test shows: in the early stage of the test, the shear stress and shear displacement are linear, and the curve shows nonlinear characteristics with the increase of shear displacement. When the other test conditions are the same, the shear stress is negatively correlated with the water content. When the water content is the same, the shear stress increases with the increase of the normal load. The numerical simulation results show that the accumulation layer slope is prone to instability under the action of rainfall factors, with the continuous increase of rainfall intensity and duration, the soil moisture content increases or is prone to damage after saturation, and the slope stability coefficient decreases continuously. Under the condition of rainfall, the deformation of the landslide body of the accumulation layer is relatively strong, and its deformation process generally undergoes three stages, creep deformation - accelerating deformation - sliding failure. The form of failure movement is mainly push-type, which has a destructive effect on the threat object through the pushing effect, resulting in personnel and property losses. The research results have certain reference significance for the mechanism research and disaster prevention and mitigation of colluvial landslides in Qinba Mountain area.

关键词

堆积层滑坡降雨大型直剪数值模拟滑坡机理

Keywords

accumulation layer landsliderainfalllarge direct shearnumerical simulationlandslide mechanism

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