Research and Application on Comprehensive Assessment Method for Non-Coal Mine Goaf Destabilization Risk
Goaf destabilization causes large-scale underground ground pressure activities,which induce surface subsidence and collapse,large-scale roofing in the stopes and underground water penetration accidents,and bring huge catastrophes to the mines.Goaf destabilization risk assessment is an important means of preventing goaf disaster,which is of vital significance to ensure the safe production of mines.Currently commonly used risk assessment methods seldom consider the offsetting effect of safety measures on the goaf risk,making the results of risk assessment deviate from the real situation.Meanwhile,existing risk assessment methods for goafs do not take into account the potential intensity of accident risk.This paper innovatively proposed a method based on numerical simulation to measure the intensity of goaf destabilization risk by introducing the total elastic strain energy index within the plastic zone around the goaf.In addition,receptor exposure is rarely a concern in risk assessment.Therefore,this paper closely coupled the independent parameters related to the likelihood of the goaf destabilization risk,the intensity of the goaf destabilization risk,the receptor exposure characteristics and the effectiveness of the management measures to characterize the goaf destabilization risk,and constructed a quadruple-coupled comprehensive assessment model,which was applied to the risk assessment of the goaf in a mine in Inner Mongolia.The assessment results show that all Ⅲ mine goaf destabilization risks are high,with a risk level of Ⅲ and a warning color of orange.The accuracy of the assessment results was verified based on the numerical simulation results,and the mechanism of goaf destabilization risk was analyzed to provide a theoretical basis for the assessment model results.The research results can provide an essential reference basis for guiding the goaf management.
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