Research on mechanism of landslides in the southwest karst mountain areas under intensive rainfall：a case study of the Guanling landslide
LI Jiangshan1，2，3，LI Bin2，3，YIN Yueping3，4，CUI Fangpeng1，GAO Yang2，3，WAN Jiawei2，3，LI Jun2，3
(1. College of Geoscience and Surveying Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. Ministry of Natural Resources，Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，
China；3. Key Laboratory of Active Tectonics and Geological Safety，Ministry of Natural Resources，Institute of
Geomechanics，Chinese Academy of Geological Science，Beijing 100081，China；
4. China Institute of Geo-environment Monitoring，Beijing 100081，China)
Abstract：The dynamic change of karst groundwater level induced by heavy rainfall has an important effect on large landslides in karst mountainous areas in southwest China. In order to clarify the mechanism of karst landslides induced by heavy rainfall，taking Guanling landslide as an example，combined with field investigation，karst development phenomenon and seepage field characteristics，this paper analyzes the genesis mechanism of Guanling landslide，and finds that，under the condition of heavy rainfall，the strong lateral recharge at the back of the slide source area raises the groundwater level，which causes the formation of high pressure water head in the slope body of the fissure water area of bedrock and induces the landslide instability on the potential weak structure plane in the slide source area. Then，the stability of the sliding body under multiple working conditions is analyzed by means of groundwater table analytic decoupling residual thrust method. The theoretical calculation results show that the average diameter of karst pipeline medium and rainfall intensity have great influence on the stability of the slope. When the average diameter of karst pipeline is 0.15 m or above，slope instability occurs under extreme rainfall conditions. The calculation formula of groundwater level and stability analysis method derived in this paper can provide useful reference for stability evaluation and prevention of karst landslides.
李江山1，2，3，李 滨2，3，殷跃平3，4，崔芳鹏1，高 杨2，3，万佳威2，3，李 军2，3. 强降雨诱发作用下岩溶山体滑坡机制研究——以关岭滑坡为例[J]. 岩石力学与工程学报, 2023, 42(6): 1497-1507.
LI Jiangshan1，2，3，LI Bin2，3，YIN Yueping3，4，CUI Fangpeng1，GAO Yang2，3，WAN Jiawei2，3，LI Jun2，3. Research on mechanism of landslides in the southwest karst mountain areas under intensive rainfall：a case study of the Guanling landslide. , 2023, 42(6): 1497-1507.
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2023, Vol. 42 
