There is a fault zone in a lead-zinc mine,and a large number of goafs are left in the mining process.Two collapse pits have been formed on the surface,which seriously affects the safety production.It is necessary to analyze the stability of the surface collapse pits and the underground stope.The Mathews stability diagram method was used to calculate the stability index and hydraulic radius,and the stability of stope roof under the existing stope parameters was evaluated.A three-dimensional numerical model including underground mining range and collapse pits was established,and the stress and deformation of collapse pits and stope were calculated by numerical simulation method.At the same time,the microseismic monitoring system was established,and the stability of collapse pits and stope was analyzed by monitoring data.The results show that the stability of collapse pits and stope is good under the current conditions.However,the activation of the fault zone has a great influence,and the energy index of the 3902-3903 stope near the fault zone is relatively large,so the engineering stability of this area needs to be focused on.
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