Research On Geological Hazard Susceptibility Zoning And Its Application In The Generation Of Railway Route Plan

With the gradual improvement of China's comprehensive three-dimensional transportation network,the construction of high-speed railway in western mountainous areas has been vigorously developed,and it is also facing more difficult engineering geological conditions.More and more railways are built in areas where geological disasters frequently occur.The survey,design,construction,operational safety and environmental stability of railways are all facing huge challenges.The Sichuan-Tibet Railway is an important strategic channel in the national railway network.The Ya'an-Linzhi section of the railway needs to pass through the Hengduan mountainous area in southeastern Tibet,where the terrain and geological conditions are extremely complex.The neotectonic movement is strong,and there are many adverse geological types,wide distribution and large scale.The Linzhi area is a typical difficult mountainous area with abnormally developed geological disasters.Through the analysis of existing environmental spatial data,an effective quantitative assessment of the susceptibility to geological disasters can be realized,and it has a good auxiliary decision-making role for railway line planning and design and direction research.In this paper,based on the engineering background of Bomi Lulang section of Sichuan-Tibet railway,the susceptibility of geological disasters in Linzhi area is studied,and the application of geological hazard susceptibility zoning in the generation of railway railway route plan is explored.First of all,the information of physical geography,population and economic level,engineering geological conditions,human engineering activities and geological disasters in Linzhi Area is collected and collated.By using the powerful spatial data processing function of geographic information system(GIS),the basic data are extracted,processed and re mined,and the environmental spatial database of Linzhi Area is constructed.Secondly,in view of the geological disasters faced by railway construction in difficult mountainous areas,combined with the internal and external causes of disasters,13 influencing factors such as elevation,slope and aspect are selected from the four aspects of topography,geological structure,ecological conditions and human activities,and the factors are normalized and classified to analyze the landslide,slope and aspect in Linzhi Area The characteristics of disaster environment and spatial distribution of collapse and debris flow are analyzed.Based on Spearman correlation coefficient,the evaluation index system of geological hazard susceptibility in Linzhi Area is established.Thirdly,the improved weighted information method is used to build the evaluation model of geological hazard susceptibility in Linzhi Area.The entropy weight method is used to calculate the weight of each evaluation index,the information of each evaluation index is weighted and superimposed,and the total information value of the disaster is reclassified.The geological disaster susceptibility zoning map of Linzhi Area is drawn,and the effectiveness of the vulnerability evaluation results is tested by using the receiver operating characteristic curve(ROC).Finally,based on the geological hazard susceptibility zoning in Linzhi Area,the cost grid data is searched and iterated in ArcGIS software to generate the minimum cost path of Bomi-Lulang section of Sichuan-Tibet railway,which realizes the automatic generation of route alignment scheme.The application of geological hazard susceptibility zoning in the dimension comparison and selection of geological hazards of route plans,line risk analysis,and optimal layout of emergency resources are studied.