| Rock burst is a kind of destructive engineering geological hazard.It has caused serious damage to personal,property and time limit in practical engineering.Therefore,it is necessary to study the prediction methods of rock burst.So the prediction level of rock burst risk can be proved reasonably and effectively,and the loss and damage can be reduced in rock burst.In this paper,the fuzzy comprehensive evaluation method is used to predict the rock burst risk.First of all,this paper choose 4 main factors,which including 14 factors,as the factor sets of fuzzy comprehensive evaluation.The main factors are respectively the lithology,the stress,the wall rocks and the hydrogeological conditions.In addition,considering the classification of rock burst intensity as the evaluation set,which are no rock burst(I),weak rock burst(II),medium rock burst(III)and strong rock burst(IV).After that,according to the characteristics of influencing factors of rock burst,the membership functions of each quantitative factors are determined by the drop half trapezoidal distribution.The membership degree of qualitative factors,such as rock type and groundwater,is given directly by the experts.So the membership matrices have been constructed.According to the analytic hierarchy process,the weight of each factor is determined.At last,the third grade comprehensive evaluation model of rock burst risk prediction is established,and the evaluation result is determined based on the principle of maximum membership.This paper takes a coal mine as example and applies the model to evaluate the rock burst of a working face in this coal mine.Based on the third grade fuzzy comprehensive evaluation of rock burst in this working face,the evaluation result is medium rock burst.It is accordance with the evaluation result of the study on rock burst risk assessment and prevention of the working face in this coal mine.It is verified the practicability and feasibility of the fuzzy comprehensive evaluation method in rock burst prediction. |
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