Quantitative Research On The Influence Factors Of Collapse, Landslide And Debris Flow Disasters In Jiangxi Province

Collapse, landslide and debris flow, these three geological disasters have similar formation conditions and distributions. They often happened together in the same area. So we put these three kinds of disasters collectively referred to as collapse slip flow disaster. China is one of the especially serious collapse slip flow disasters countries all over the world. Studying the problems which related to the collapse slip flow disasters is very important significance to the national economic construction. This paper analysed, quantitative researched the collapse slip flow disaster’s factors through the introduction of the concept of the collapse slip flow disaster’s multiple index and susceptibility index. Using the method of control variables, combined with the data related to Jiangxi collapse slip flow disaster of the "jiangxi 1:50 geological survey report of environment". Summed up the common law of collapse slip flow disaster’s multiple and susceptibility under the action of topography and geomorphology, slope, geotechnical component,the time of rainfall and the strength of rainfall, provide a reference for risk prediction of geological disasters.The main results of this research include the following several aspects:(1)Collapse slip flow disaster in research area often happens in the area which is rain for a long time.The continuous rainfall of 3 to 4 days to collapse multiple segment,5 to 6 days to landslide multiple segment,debris flow most prone to continuous rainfall of more than 6 days. Collapse slip flow disaster often happens at the same time with the rainfall.But there are a lot of data shows that the occurrence of landslide has the rainfall lagging phenomenon.(2) In this area,collapse slip flow disaster often happens at the altitude of 100～ 500m above the sea level.Landslide and debris flow are prone to a little steep and steep area,while collapse is easy to occur in hilly area and middle mountain area.(3)Collapse, landslide are prone to the rock and soil type of sand shale formation zone of soft hard alternated,landslide is also prone to secondary karst limestone, dolomite,intrusive rocks in the area,debris flow is prone to the type of rock and soil with weak karst limestone sandstone shale, hard-based hard sandstone shale area.(4)Susceptibility index index analysis method as a kind of information data processing method.It has the double function of sample classification and system factor analysis,which is a generalized optimization analysis method combination of qualitative and quantitative analysis.Research on the collapse slip flow disaster’s susceptibility index is helpful to improve the correlation analysis of the factors,which providing an important basis for collapse slip flow disaster risk assessment.