Study on Reasonable Space-Time Relationship of Opposite Mining in Close-Distance Coal Seams
In order to determine the reasonable space-time relationship of opposite mining in close-distance coal seams,taking the 1503 working face and 11002 transportation trough as the engineering background,theoretical analysis and numerical simulation were used to analyze the distribution law of the advance abutment pressure of the working face in the process of the opposite mining and the evolution law of the floor stress of the goaf in the process of the backward mining.Theoretical calculation results show that the sum of the influence range of the advance abutment pressure of the 1503 working face and 11002 transportation trough in the opposite mining process is 131.01 m,and the lag influence distance of the 1503 working face is 59.55 m.The numerical simulation results show that the minimum of influence distance of advance abutment pressure between the 1503 working face and the 11002 transportation trough in the opposite mining process is 140 m,and the minimum lag influence distance of the 1503 working face in the backward mining process is 60 m.The theoretical calculation was basically consistent with the numerical simulation results.According to the results,a reasonable space-time relationship between 1503 working face and 11002 transportation trough is proposed to guide the safe production of the face.According to the research results,a reasonable space-time relationship design scheme between 1503 working face and 11002 transport trough was proposed,which can be used to guide the safe production of working face.