Stability Evaluation of Large and Gently-inclined Goaf

As there are plenty of factors affecting the stability in the mined-out area and in order to better evaluate the stability of large and gently-inclined mined-out area,this paper numerically simulated the multiple mining conditions with FLAC 3D finite difference software and proposed major factors affecting the stability in the mined-out area of such type,and then weighed each influencing factor with analytic hierarchy process(AHP)on this basis.On the goal stability of many coal mines in Zhongyang County of Shanxi Province,we scored the each influencing factor according to the Comprehensive Scoring Table of Influencing Factors,and finally computed the total score of the stability in the mined-out area and comprehensively determined the grade of stability in the mined-out area thereby.Results from this method for stability evaluation are consistent with those from the observational method for the ground movement deformation in goaf,therefore,the results are of great referential significance to evaluate the stability in similar mined-out areas.