The Evaluation Approach Study on the Hazard of Shallow Embedded Goaf Collapse

In view of the complexity and uncertainty of shallow embedded goaf,the effective method for evaluating the hazard of goaf collapseis lacked at present.Based upon detailed investigation and probing for shallow embedded goaf,the quantitative fuzzy comprehensive approach on the basis of analytic hierarchy process for evaluating goaf collapse is put forward.First,on the basis of analysis of geological conditions and the goaf collapse mechanism as well as the influential factors in the research area,the evaluating factor system and criteria for goaf collapse are to be established.Second,in accordance of the difference between discrete variable and continuous variable,the expert judging method and appropriate membership idea function model are employed respectively in constructing membership idea matrix.Simultaneously,the weight numbers can be obtained by applying eigenvector method of analytic hierarchy process.Last,the evaluation vector quantity can be attained through weigh number matrix and membership idea matrix compositional operations.The hazard grade level will be determined by applying the fuzzy nearness degree principle.This paper shows that the comprehensive fuzzy evaluation approach is practical and effective in the aspect of evaluating the hazard for shallow embedded goaf collapse.