DEVELOPMENT CHARACTERISTICS AND TYPICAL GEOMECHANICAL MODELS OF HIGH-POSITION LANDSLIDES IN SICHUAN
According to literature review,field geological investigation,and inductive analysis,this article analyzes the distribution characteristics of high-level landslides in Sichuan Province and the formation mechanisms of Ladder Gully landslide,Xinmo Village landslide,and Zhaobi Mountain landslide.The following conclusions are drawn:(1)The densely distributed landslide disaster zone in the region coincides with the boundary of the regional stress field formed by Longmen Mountain Fault,Xianshui River Fault,and Anning River Fault,which forms a"Y"shape;(2)The development of high-level landslides is significantly influenced and controlled by the topography and geomorphological conditions.Steep slopes with large elevation differences provide good conditions for landslides,and slopes with a gradient of 30°～35° are conducive to slope accumulation,providing material conditions for landslide formation;(3)The alternating layers of soft and hard rocks have lower hardness,relatively weaker mechanical strength,and are prone to weathering,belonging to easily slid strata.Under the softening effect of the underlying soft rocks,the upper harder rocks are more prone to sliding and forming landslides;(4)The formation mechanisms of large-scale high-level landslides such as Ladder Gully landslide,Xinmo Village landslide,and Zhaobi Mountain landslide are analyzed,including the tipping-fracture type,the pull-apart-bedding sliding type,and the creep-pull-apart type.Based on the above understanding,this study can provide references for the risk prevention and control of high-level landslides in Sichuan Province.
high-position landslidesdevelopment distribution lawformation mechanism"Y"shaped faultSichuan
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