Risk Assessment Of Geological Disaster Of Shallow Soil Landslide

In Guizhou Qiannan and other metamorphic rock areas,the Quaternary loose deposits are widely distributed,and under the action of rainfall,it is easy to cause types of geological disasters.This article focuses on shallow soil landslides and takes Weng'an County,Guizhou Province as the research area and passes specific sample points.The spatial distribution of regional soil layer thickness is studied,shallow soil landslides are classified,and regional risk assessment is carried out.Moreover,And carried out a single risk assessment based on specific points.The following results have been achieved through the research:Collected 278 soil layer thickness sample data in Weng'an County,combined these data with the actual situation of the study area,and divided them into four genetic types: residual,slope,residual,and alluvial,combined with geology Relevant theories such as statistics and statistics use single-factor statistical analysis to screen out the influencing factors of the soil layer thickness of different origins.Considering the different factors affecting soil thickness of different genetic types,the study area is mapped according to the type.Through statistics of the distribution characteristics of different genetic types of soil in topography,landforms,and lithology,etc.,we made full use of 3S methods to carry out the zoning map of the study area: residual area,slope area,residual slope area,alluvial area.Moreover,extracted the soilless area(water system and exposed bedrock area)in Weng'an County.To obtain the spatial distribution of soil layer thickness on a regional scale,a multidisciplinary approach is adopted.The research ideas of soil thickness related to soil layer thickness are used for reference,and the decision tree model is used to establish the relationship between various types of soil layer thickness and influencing factors,The importance order of each influencing factor was obtained.The spatial distribution map of soil thickness in the study area was inferred,and the result was proved to be feasible.According to the mechanical failure mechanism,the types of shallow soil landslides are summarized: creep-slip-cracking,slip-slip-cracking.In addition,the mudflow on the slope is also classified as a particular type of shallow soil landslide.Analyze their influencing factors and establish different index systems for different types.In the study area,the fuzzy comprehensive evaluation method was used to evaluate each type of shallow soil landslide's susceptibility and risk,and the risk was integrated by coefficient reduction.On this basis,based on the population and economy of the study area,vulnerability evaluation and risk evaluation are carried out,and the results are divided into five grade areas.Taking a typical single landslide in Yinzhan Town — Dazhulin landslide in a high-risk area as an example,the stability analysis,failure probability analysis,and the delineation of the hazard range are carried out.On this basis,the population,The economy have carried out a vulnerability analysis,and after value estimation,the risk result is obtained.