Study On The Stability Of Qinliu Landslide In Li County

Landslide is a serious geological disaster next to earthquake and flood.Because of the large area of mountain area in China,the density and frequency of landslide in mountain area are high.With the development of social and economic construction,human engineering activities are constantly transforming the original landforms and landforms,which is extremely easy to cause the occurrence of a large number of new landslides,ranging from the destruction of vegetation and obstruction of roads,to the destruction of houses and resulting in casualties,it is a serious threat to people’s lives and property.The analysis of landslide stability is the most important basic work for controlling landslide hidden danger,and is also the theoretical basis for handling landslide scientifically,it plays an important role in the early warning and prediction of landslide development trend and in reducing the loss of life and property caused by landslide disasters.In this paper,the Qingliucun landslide in Li County is taken as an example to analyze and study the landslide stability.The main findings and findings are as follows:(1)Through collecting and arranging the data of the landslide in the research area,combining the field investigation,combining the high-density electrical method,and applying the engineering geology principle,the spatial distribution,basic characteristics,deformation characteristics and main influencing factors of the landslide in the study area are basically revealed,and the material structure characteristics,hydrogeological conditions and physical and mechanical properties of the landslide rock and soil are determined,the stability of landslide is analyzed qualitatively.(2)According to the site investigation and comprehensive analysis,the main factors affecting the safety and stability of the landslide are: Topography,stratum structure and engineering characteristics,the role of water,earthquake and human engineering activities.The loess-like silty clay and its engineering properties are the material basis and prerequisite for the formation of the landslide,and the high and steep slope topography provides the temporary conditions for the formation of the landslide Human engineering activities,precipitation,earthquake and other factors are the main inducing factors of landslide formation,many factors superimposed each other,resulting in Qingliucun landslide development.Human engineering activities,precipitation,earthquake and other factors are the main inducing factors of landslide formation,many factors complement each other,resulting in Qingliu landslide development.(3)According to the main factors of landslide instability,three calculation conditions of natural,rainstorm and earthquake are selected,and the stability calculation model is determined according to the deformation characteristics of the slope,the transfer coefficient method and simplified bishop method are used to calculate the stability of 9 sections under three different working conditions,and the stability of the landslide is quantitatively analyzed.The comprehensive evaluation of landslide stability shows that the H01 landslide as a whole is basically stable at present,but due to the adverse factors such as rainstorm and earthquake,the H01 strong deformation will continue to develop to the traction deformation area,causing the cracks in the trailing edge to further expand,the H02 slide area is in a state of continuous deformation,and the front edge has a small-scale slide almost every day(generally tens of sides),and the soil in the anti-slide section of the front edge gradually slides,the upper part of the slope in the H02 strong deformation area is in the stage of continuous development,the slope is in an unstable-unstable state,and the village gathering area is in a stable state,there is no obvious deformation sign and development trend on the whole slope.The calculated results are in good agreement with the field investigation.(4)According to the on-site investigation and monitoring situation,analyze the movement characteristics after the landslide starts,comprehensively judge the whole process of the landslide starts,predict the danger of blocking the Mengtun River after the landslide instability,and put forward reasonable landslide control suggestions for the protected objects in the study area.