Risk Assessment of Goaf Collapse Based on Analytic Hierarchy Process and Frequency Ratio Model
The risk assessment of goaf collapse provides important basis for the planning,monitoring and early warning of geological hazards.This work established a risk assessment AHP-PF model for goaf collapse with the methods of analytic hierarchy process(AHP)and frequency ratio model.Taking the Puhe-Qingshui mine in Shenyang as an example,this work selected eight evaluation indexes considering three factors of geological conditions,surface characteristics and mining conditions.These eight evaluation indexes are Quaternary coverage type,Quaternary loose layer thickness,geological structure complexity,roof strength index of recoverable coal seam,coal seam inclination angle,surface subsidence rate,ratio of mining depth to mining thickness,and number of overlaid layers in goaf.The combined AHP-PF model was used to calculate the weight and frequency ratio of each index,and the risk zoning of mining subsidence was performed.The evaluation suggests that high risk of ground collapse mainly occurred in the areas with small ratios of mining depth to mining thickness,large subsidence rate and the areas still being mined,which should be focused for geological disaster prevention and relocation avoidance.
analytic hierarchy processfrequency ratioriskgoaf collapsePuhe-Qingshui mineShenyang City
万方数据
维普
