| The Sichuan-Tibet Railway is a major project of the country in recent years.The complex geological conditions and frequent geological disasters around the Batang station section of the proposed Sichuan-Tibet Railway hinder the socio-economic development of the region.Relying on the activity structure and geological survey project of the traffic corridor in the western Sichuan-eastern Tibet area,this paper selects the geological hazards in the surrounding area of the Batang station section of the Sichuan-Tibet Railway as the research object.Environmental conditions,distribution of geological hazards,development characteristics,and factors affecting the development of geological hazards.Eight factors including engineering geological rock group,distance to fault,elevation,slope,surface cutting depth,distance to water system,NDVI value,and distance to highway were selected to construct an evaluation index system,and the factor risk was completed according to the statistical results of the eight factors According to the classification of risk levels,a fuzzy comprehensive evaluation model is established,and a factor membership function is constructed to calculate the risk membership of each factor.At the same time,AHP,CRITIC and combined weighting method are used to complete the weight calculation of 8 factors.On the Arc GIS platform,a geological hazard risk zoning map based on 3 weighting methods is added based on the hazard membership and weight overlap of 8 factors.The results of fuzzy comprehensive evaluation based on AHP show that the areas of extremely high,high,medium and low geological hazards are 60.22km2,122.01km2,127.41km2 and90.36km2 respectively,accounting for 15.07%,30.5%,31.85%,22.59%;the fuzzy comprehensive evaluation results based on CRITIC show that the areas of extremely high,high,medium and low geological hazards are 50.86km2,108.07km2,123.28km2 and117.79km2 respectively,accounting for 12.72%,27.02%,30.82%,29.45%;the results of fuzzy comprehensive evaluation based on combined weighting show that the areas of extremely high,high,medium,and low geological hazards are 55.7km2,120.22km2,127.96km2,and 96.12km2,respectively,accounting for 13.92% of the total area.%,30.06%,31.99%,24.03%.Comparing and analyzing the above three evaluation results,it can be seen that the three results are roughly consistent with the distribution of geological hazards in the study area.If there is a certain deviation,after the ROC curve test,the geological hazard risk assessment results based on the combined weighting method have higher accuracy and are more in line with the actual situation of the study area. |
