Feasibility Study on Repeated Mining Operation Under Buildings in Guanshan Coal Mine

To find out the threat degree of repeated mining to ground buildings, a mechanical model for the superposition of various moving deformation values on the ground under repeated mining operation is proposed. The method of predicting and analyzing the subsidence value, inclined deformation value, horizontal deformation value and curvature deformation value of the ground under the repetitive mining operation is studied by using the developed subsidence prediction system of mine stope and the superposition system of ground deformation of repetitive mining. According to the requirements of Three Regulations, the feasibility of repeated mining operation is determined. The prediction results show that: taking 0901 face and 1001 face of Guanshan Mine as the examples, under the repeated mining conditions, the surface deformation values of the ground structures are all within the scope of Class I specified in Three Regulations. That is, the safe use of the building can be ensured without maintenance or simple maintenance, and repetitive mining plan is feasible. Set up a surface movement deformation monitoring station to monitor the surface deformation after the mining of 0901 and 1001 working faces in Guanshan Mine, observations are within the scope of Class I specified in Three Regulations, which verifies the accuracy of the expected result.