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[1]XUE Zhiwen,XU Chong,FU Dengwen,et al.Analysis of the Causes of the Landslide Disaster in Zhenxiong,Yunnan on January 22,2024[J].Journal of Seismological Research,2025,(01):80-88.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0008 ]

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Analysis of the Causes of the Landslide Disaster in Zhenxiong,Yunnan on January 22,2024

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 01 Page number: 80-88 Column: Public date: 2024-12-20

Title:: Analysis of the Causes of the Landslide Disaster in Zhenxiong,Yunnan on January 22,2024

Author(s):: XUE Zhiwen¹; 2; 3; XU Chong¹; 2; FU Dengwen⁴; GUO Yongxiang⁵; (1.National Institute of Natural Hazards,Ministry of Emergency Management of China,Beijing 100085,China；2.Key Laboratory of Compound and Chained Natural Hazards Dynamics,Ministry of Emergency Management of China,Beijing 100085,China；3.School of Emergency Management Science and Engineering,University of Chinese Academy of Sciences,Beijing 100049,China) (4.Coal Geology and Prospecting Institute of Yunnan Province,Kunming 650217,Yunnan,China；5.Kunming Engineering Corporation Limited,Kunming 650032,Yunnan,China)

Keywords:: the Zhenxiong landslide; weak trigger; disaster-prevention; landslide causes

CLC:: P315.94

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0008

Abstract:: This paper takes the landslide in Liangshui Village,Zhenxiong County on January 22,2024 as an example,and makes a detailed analysis of the causes of the landslide by consulting media information,geographical and environmental factors analysis and comparative analysis.The results show:①The landslide is weakly dependent on external trigger conditions and greatly influenced by natural factors,so it is classified as a weak trigger landslide.②The high and steep slopes and unstable gentle slope platforms near the incident constitute the basic conditions for landslides,which are prone to collapse and slide under the action of gravity.③Triassic sandstone and mudstone and marl are mixed with thin shale,which are easy to soften,argillize and seep along rock layers,structural joints or supergene weathering cracks.Structural joints vertically cut the rock strata,forming an unstable staggered overhead structure.Once displaced,this layered jointed rock mass will rapidly develop into toppling deformation and even structural collapse.④Rainfall seepage will erode the cracks in dissolved rock mass,soften the rock layer and reduce friction.The seepage softening of snow melt water and the repeated freezing and expansion of water body gradually expand the crack width and laterally squeeze out the displacement,which reduces the stability of jointed rock mass.When the landslide occurs,the temperature is low,and the accumulated precipitation is 10-30 mm.The progressive effect of these climatic factors significantly increases the landslide risk.⑤Mining,road construction and other human activities may lead to groundwater level,thus changing the geological structure and hydrological conditions and aggravating the risk of geological disasters.The occurrence of landslide is a complex systematic process,which includes both internal geological conditions and long-term influence from external factors.On this basis,a series of suggestions and inspirations are put forward.

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Last Update: 2025-01-01