In the natural environment and engineering construction,bedding rock landslides have always been one of the re-search hotspots in the field of geological disasters due to their characteristics of easy occurrence,frequent occurrence,and sudden occurrence.Taking the Dabaoshan Landslide in Jianshi County,Hubei Province as an example,the strength weakening law test of the structural plane with weak interlayer was carried out by field investigation and UAV photography.Considering the combined effect of rainfall and excavation,a numerical simulation analysis of dynamic stability and accumulation characteristics was conduc-ted to explore the causes of slope failure and reveal the deformation mechanism of the slope.The main conclusions are as follows:① The stability coefficients of natural slopes under natural and rainstorm conditions are 1.35 and 1.20,respectively.The stability coefficients of excavated slopes under natural and rainstorm conditions are 1.04 and 0.90,respectively.Under the most unfavor-able conditions,the instability failure occurs after the fourth stage of excavation of the slope,and the inducement is the combined effect of rainfall and excavation.② The failure mode of the slope is a typical slip-crack failure.That is,the front edge of the landslide body is laterally uplifted,the middle and rear edges are traction sliding,the rear edge is tensile failure,and the landslide body is sliding along the weak structural plane.③The deformation,failure,and accumulation process of the Dabaoshan Landslide can be divided into five stages,namely,the crack development and penetration stage,the dynamic response stage,the overall high-speed sliding stage,the platform collision braking stage,and the accumulation lateral extrusion sliding stage.The front edge of the landslide accumulates at the foot of the slope,the accumulation distance is about 15～25 m,the overall slip horizontal distance is about 15 m,and the maximum displacement of the landslide is up to 30 m.The research results have a certain reference value for the study of similar bedding rock landslides.
关键词
顺层岩质滑坡/降雨/边坡开挖/数值模拟/强度弱化/大包山滑坡
Key words
bedding rock slope/rainfall/slope excavation/numerical simulation/strength weakening/Dabaoshan Landslide
维普
万方数据