Study On Geohazard Susceptibility Evaluation Based On Combination Weighting Method In Jiaokou Country

Shanxi Province is located in the eastern part of the Loess Plateau and the western part of the Taihang Mountains.It has complex geological conditions and poor rock integrity.At the same time,it has rich mineral resources and frequent mining activities,forming a large area of mined-out areas.Therefore,geological disasters are prone to high levels and severely restricted Local social development.Evaluating the susceptibility of geological disasters in an area can provide a reliable basis for disaster prevention and the construction of human engineering activities,and has important practical significance.Based on the "Jiaokou County High-precision Geological Hazard Special Investigation" project,with Jiaokou County as the research area,this paper analyzes the formation conditions of geological disasters in the region based on field surveys and relevant data collection,and establishes a susceptibility evaluation system Using the analytic hierarchy process and the coefficient of variation method to obtain the subjective weight and the objective weight respectively,and then use the distance function method for combined weighting,obtain and verify the zoning results of the geological hazard susceptibility evaluation in the study area,which is the geological hazard in the area.Provide basis for prevention.The main results of the thesis are as follows:(1)Conduct field surveys of the geological environment and geological disasters in the study area,summarize and analyze the development characteristics,distribution rules and formation conditions of geological disasters such as collapses and landslides in the area.(2)Select 9 evaluation indicators of geomorphology,slope,elevation,rock and soil type,water system,rainfall,mining activities,roads and villages,and carry out correlation analysis on them,establish a geological hazard susceptibility evaluation system,and adopt different levels The analysis method and the coefficient of variation method judge the selected evaluation index subjectively and objectively,and then use the distance function method to obtain the comprehensive weight of each evaluation index.(3)Based on the information volume method,the geographic information system is used to complete the analysis of the geological hazard susceptibility evaluation results of the study area under the subjective model,the objective model and the combined weighting model.The study area is divided into four by the natural discontinuity method Grade division,namely extremely high prone area,high prone area,moderate prone area and low prone area.(4)The evaluation results obtained by the three models are double-validated using the hazard point density and ROC curve methods.Finally,the combined weighting model is selected as the final susceptibility evaluation model of the study area,and the corresponding geological disasters in the study area are obtained.The susceptibility evaluation zone map.