Hazard Assessment And Zoning Research Of Landslide In Tianquan Section Of Sichuan-tibet Railway Based On GIS

Due to the dangerous terrain,complicated structure and broken rock layers of the Tianquan section of the Sichuan-Tibet Railway,more geological disasters occurred in the study area,which seriously threatened the construction and future operation of the SichuanTibet Railway.In this paper,through the geological survey of the study area,and the analysis and research of the actual disasters,the corresponding conditions for inducing disasters are obtained,the influencing factors of the geological disasters in the study area are drawn up,and the mathematical model and ARCGIS platform The assessment of disaster susceptibility includes the following:(1)A geological survey was conducted in the study area to obtain data such as the geological conditions and types of geological disasters in the area.According to relevant literature and on-site investigation materials,the laws and influencing factors of geological disasters in the study area were analyzed and obtained.(2)Combining the results of geological surveys with historical geological hazard data,constructing a geological hazard database for the Tianquan section of the Sichuan-Tibet Railway,using the ARCGIS platform to process the geological data in the study area,and combining the data to analyze and develop the study area The six evaluation factors of elevation,slope,aspect,lithology,river buffer zone,and structural buffer zone are based on the spatial analysis function of the ARCGIS platform.After processing,the quantitative results of each factor are obtained,thus establishing the disaster in the study area.Evaluate the model.(3)Based on the information quantity model,the information quantity of each factor in the study area is calculated to obtain its value,and each factor is assigned to its corresponding information value using the ARCGIS platform.Based on the reclassification function,the susceptibility distribution map of the information quantity model in the study area is derived.(4)Based on the Logistic regression model,extract a certain number of non-geological hazard points in ARCGIS as the control group of geological hazard points,and obtain the data of the experimental group and the control group,import the data into SPSS software for analysis and processing,based on Logistic After deriving the susceptibility equation from the regression principle,the equation is imported into the ARCGIS platform to obtain the susceptibility distribution map under the Logistic regression model in the study area.(5)Combining the information quantity method with the Logistic model,based on the I+ LR model,the geological disaster vulnerability assessment of the study area was conducted again,and the vulnerability distribution map was obtained.Finally,the ROC curves of each model are fitted,and the evaluation results are analyzed and compared to obtain the optimal solution.