Stability evaluation of mining-induced area based on depth of loading disturbance
The safety depth under load disturbance,as a key index for judging the danger of mining extraction sites,is of great guiding significance for mine geosafety and deformation control.The limit equilibrium method is used to analyze the structural characteristics of the natural equilibrium stress arch of the ruptured rock body in the wall mining area,and the depth of the additional stress influence in the foundation under the rectangular homogeneous load is calculated by using the angular point method,and the formula for calculating the critical depth under the load perturbation in the underground min-ing working face and the upper part of the mine is deduced.The results of the study using the stability evaluation of the min-ing site of a mine in Jining City,Shandong Province as an engineering example show that the critical depth of the activation of the mining void zone taking into account the additional stresses of the overlying load is 159.5 m.The comparison of the results of the stability evaluation of the site obtained by using the discriminative method of the mining conditions and the discriminative method of the ground movement and deformation is consistent,which proves the effectiveness and feasibility of the proposed method.The research results can provide scientific theoretical support for the structural characterization of the fractured rock body in the post-mining area under similar geological mining conditions and the evaluation of the geological risk of mine safety.
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