Research On The Risk Evaluation Of Rock Burst And Gas Outburst Composite Disaster Based On Improved Fuzzy Comprehensive Evaluation Method

As my country's coal resources enter deep mining with high intensity,the geological conditions are complicated,and the increase of gas content and pressure induces rock burst gas outburst compound disasters,which seriously restricts the green,safe and efficient mining of coal resources.Prediction of disaster risk is an important basis for disaster prevention.So far,the research on the risk assessment of the composite disaster of rock burst gas outburst is still in its infancy,so the research on the risk assessment of gas burst gas burst composite disaster is imminent.This paper takes mines with typical rock burst gas outburst compound disasters as the research object,and uses the means of field investigation,literature integration,theoretical analysis,mathematical calculation,and engineering verification to carry out research on the risk assessment method of compound disasters.A new evaluation method for the risk of rock burst gas outburst compound disasters.(1)Through the analysis of the characteristics of typical composite disaster cases,the main influencing factors of rock burst gas outburst composite disasters are summarized,including coal impact tendency,surrounding rock properties,mining depth,geological structure,coal seam thickness change,mining Velocity,residual gas content,residual gas pressure,goaf protective layer conditions,etc.,and these influencing factors are divided into three categories,namely geological influencing factors,coal and gas influencing factors,and mining technology influencing factors.Build an evaluation index system for the risk of outburst gas burst composite disasters and classify them according to relevant norms,existing methods and practical experience.(2)Aiming at the ambiguity of the evaluation object of the outburst gas pressure compound disaster,it is proposed that the traditional fuzzy comprehensive evaluation method has the problem of unreasonable weight determination,and the comprehensive weight is determined by using the analytic hierarchy process(AHP)and the entropy weight method(EWM)reconstruction.,and finally combined with the degree of membership to establish a composite hazard evaluation of rock burst gas outburst based on the improved fuzzy comprehensive evaluation method,and propose a new evaluation method.A typical case is used to verify the rationality of the evaluation method,and the evaluation results are consistent with the actual situation,which proves that the evaluation method is reasonable.(3)Finally,the engineering application is carried out,and the evaluation object is Pingdingshan Minmetals.Collect and sort out the data of Pingdingshan Minmetals,and predict and evaluate the risk of rockburst gas outburst compound disasters in the second mining area of Pingdingshan Minmetals based on the improved fuzzy comprehensive evaluation method.The new evaluation method can provide a reference for the followup prevention and control of coal mines.