| Landslide is a geological hazard next only to the earthquake,it has a series of characteristics,such as high frequency,wide distribution,changeable situation,great destructive force and a series of characteristics.It poses a great potential threat to the daily life and life and property of the people in the disaster-prone areas.In the Loess Plateau region of Northwest China,geological disasters occur frequently under the action of nature and man due to the incoherent topography,complex soil,mixed gullies,harsh environment and unique climate in loess area.loess landslide is the most common disaster..According to statistics,landslide hazards in the Loess Plateau area account for about 1/3 of the landslide hazards in China.In recent years,there have been many serious landslide disasters in Baoji area of Shanxi Province.This paper takes Baoji city of Shanxi province Jintai District Motian courtyard landslide as the research object,based on the field investigation of the landslide,the investigation report of predecessors and the research and Analysis of relevant Geotechnical Test data,using numerical simulation software to carry out the analysis about the stability of landslide under different working conditions,drawing a conclusion that the landslide is in a stable state under deadweight condition,unstable state under self-weight plus rainfall condition,and unsteady state under self-gravity plus earthquake condition.And the risk was evaluated by this conclusion.1)Through the regional information and available survey reports,as well as on-site surveys,making a study in detail about the topography,geological structure,stratigraphic lithology,meteorology and hydrology in the study area.And based on the results of the fieldinvestigation,the development characteristics of landslide in this study area are summarized from several aspects,such as shape and scale,boundary,surface,interior,sliding and so on.2)The main factors influencing the formation of the Motian courtyard landslide are analyzed.Drawing a conclusion that the landslide is caused by geological structure,landform,precipitation,earthquake,stratigraphic lithology and human activity.In the stability analysis of the landslide,the residual sliding thrust is calculated by transfer coefficient method.3)Numerical simulation of the landslide under the conditions of deadweight,self-gravity and rainfall,self-gravity and earthquake by using finite difference software,so that its stability is analyzed concretely.4)The stability coefficient of landslide was calculated by transfer coefficient method,and combined with the probability of landslide disaster.The risk of the landslide is evaluated by the combination of statistical analysis and expert experience in the end.According to the results of the analysis,and combining the actual situation of the field in the study area,putting forward some suggestions for prevention and control of the landslide. |
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