Stability Evaluation of Mined-out area in Medium-deep Hole Stope Based on Entropy Weight Extension Matter-Element Model
To address the problems of randomness and dynamics in the evaluation of the stability of the mined-out area in medium-deep hole mining,a method of evaluating the stability of the mined-out area in medium-deep hole mining based on the improved entropy weight method and the object element analysis method was proposed in this paper.Considering three aspects of environment,geology and engineering,14 evaluation indexes such as maximum geostress were selected,the improved entropy weighting method was utilized,and the 14 evaluation indexes were objectively assigned.An objectively empowered elemental analysis model was constructed,and a set of grading standards for the stability of the mined-out area of medium-deep hole mining was formulated.Taking H8 ore body of Hexi district of Maoping lead-zinc mine as the research object,the stability evaluation of the mined-out area of medium-deep hole mining arranged along the strike of the ore body was carried out.Numerical simulation was used to invert the process of medium-deep hole mining and filling,and analyze the results of stress,plastic zone and displacement of the rock in the mined-out aera after medium-deep hole mining,so as to compare and verify the feasibility of the method of evaluating the stability of the mined-out aera in the medium-deep hole stope.The results show that the eigenvalues of the variables of the medium-deep hole stope mined-out area level in the H8 ore body of the Hexi district of Maoping lead-zinc mine are 2.27,i.e.,B(more stable)grade,and combined with the capacity of on-site equipments and the morphology of the ore body,the industrial test of optimization of the stope structural parameters can be further carried out.The model overcomes the subjectivity of evaluation index weighting analysis,and the results are accurate,which can guide the selection and optimization of the structural parameters of the medium-deep hole mining field,guarantee the safe and efficient mining of the medium-deep hole mining field,and at the same time provide theoretical support for the application of the medium-deep hole mining technology in similar underground mines.
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