Cause Analysis Of Lianhuashan Landslide In Sinan County Of Guizhou Province And Suggestions For Engineering Prevention And Control Measures

China is one of the areas with the most serious landslide disasters.Since the 20th century,with the increasing of the world's population,the range and the intensity of human activity have been raising,the impact on the geological environment is also increasing.With the development of social economy and the increasing awareness of geological hazard prevention,a lot of investigation,design and monitoring of landslide have been carried out in recent years,and the deformation and failure mode of landslide have been studied step by step.Taking Lianhuashan landslide,a typical gravel soil overburden landslide in corroded medium-sized mountain and river valley slope area of Sinan County,Guizhou Province,as an object,the development characteristics,stability and comprehensive prevention and control of the landslide are studied.The main research results are as follows:1.Based on the investigation of geological environment conditions of Lianhuashan landslide,the boundary,scale and morphological characteristics of the landslide are expounded,and the material composition of sliding body,sliding zone and sliding bed,the deformation and failure characteristics of landslide,the factors affecting stability and the mechanism of deformation and failure are analyzed.The material composition of the slide body is mainly quaternary collapse gravel soil,and the sliding body size is about 13.5×10~4m~3,which belongs to the medium-sized middle-level traction soil landslide.Leading edge excavation is the main inducing factor of landslide.2.The stability of Lianhuashan landslide was analyzed by means of limit equilibrium method and Morgenstern-Price method.It is calculated that the main deformation area of Lianhuashan landslide(2-2 section)is in a basically stable state,which is basically consistent with the present situation and deformation of the landslide,which only produces large deformation,but does not slip as a whole.Under the first and second conditions,the traction and tensile deformation zone(the leading edge of the deformation zone of 4-4 section)is in an unstable state,which is basically consistent with the formation mechanism of the deformation mechanism of the leading edge,which is mainly caused by the high and steep near air at the leading edge and the lateral traction in the main deformation zone.3.In view of the genetic mechanism and main inducing factors of Lianhuashan landslide,the deformation characteristics of landslide disaster are analyzed,and the stability of landslide is analyzed by using limit equilibrium method and Morgenstern-Price method.Square cutting engineering,anti-slide pile project and drainage ditch project and the monitoring are put forward,which is provided for similar landslide prevention and control as a certain reference.