| Baode county is located in the west of Xinzhou City,Shanxi Province.It is located in the typical loess plateau,and the regional geological environment is relatively complex.In recent years,human engineering activities such as mining of mineral resources,building houses and roads are frequent,and seasonal heavy rainfall occurs from time to time,which has induced a large number of geological disasters.The occurrence and evolution of these geological disasters seriously threaten the life and property safety of the people in the county.On the basis of fully collecting the regional geological environment data of Baode County,combined with the field geological disaster investigation,this paper makes an in-depth analysis and Research on the development characteristics,distribution law,formation conditions and formation mechanism of geological disasters in Baode county.At the same time,make full use of the spatial analysis function of GIS software to evaluate the geological disaster risk of Baode county through analytic hierarchy process and information model.The main results are as follows:(1)Geological disasters in Baode county are mainly collapse and landslide,with a total of 82.There are 62 collapses,including 40 rock collapses and 22 soil collapses,all of which are small-scale collapses;There are 20 landslides,all of which are soil landslides,with the scale of small and medium landslides.Geological disasters in Baode county are mainly formed in the period of intensive human engineering activities and concentrated rainfall,which are mainly distributed on both sides of rivers and valleys in space.(2)Landform and formation lithology are the basic conditions for the formation of geological disasters in Baode County,and heavy rainfall and frequent human engineering activities are the main factors inducing the formation of geological disasters.The deformation and failure modes of collapse disaster in Baode county mainly include toppling,sliding and tensile collapse.The deformation and failure modes of landslide include staggered landslide in loess layer and sliding landslide along soil rock interface.The formation mechanism of geological disaster is studied through these five deformation and failure modes.(3)Eight evaluation factors such as slope,elevation,slope type,slope direction,engineering geological rock group,distance from river,distance from residential area and distance from road are selected.The geological hazard susceptibility zoning of Baode county is obtained by superimposing various factors with Arc GIS software.The susceptibility evaluation results are superimposed with rainfall factors,and the geological hazard risk assessment of Baode county is completed according to the four grade zoning of extremely high risk area,high risk area,medium risk area and low risk area.(4)The vulnerability evaluation factor system is constructed by selecting population density,building density and traffic facility density,and the vulnerability zoning of geological hazards in Baode county is obtained through superposition calculation of Arc GIS software.According to "risk = danger" × Through the quantitative evaluation formula of "vulnerability",the geological disaster risk results and geological disaster vulnerability results are superimposed and multiplied by Arc GIS software to obtain the geological disaster risk zoning of Baode county.The results are that the extremely high-risk area accounts for 2.82% of the total area of the county,the high-risk area accounts for9.00% of the total area of the county,and the medium risk area accounts for 19.88% of the total area of the county,Low risk areas account for 68.30% of the total area of the county. |
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