Research on Overlying Strata Movement and Surface Subsidence Law of Mining Face with Double Coal Pillars
Aiming at the structural problem of double coal pillars caused by shrinkage during the mining process of Hulusu Coal Mine,the 21102 and 21201 working faces of Hulusu Coal Mine were taken as the engineering background to study the overlying strata movement and surface subsidence law of coal seam mining in mining face with double coal pillars.The results show that the overlying No.2 rock stratum of 2-1 coal seam is the main key stratum and forms the masonry beam structure,which plays the most important role in controlling the manifestation of mining pressure and overlying strata movement.The surface monitoring data shows that the 21102 working face has fully entered a stable period of mining subsidence.As mining the 21201 working face,the surface subsidence speed is timely and stable,and the overlying strata moves with mining,which results in less danger.The similar simulation test results show that with the excavation of the model,the transverse cracks gradually expand towards the overlying strata,and the separation distance also gradually expands,leading to instability and collapse.The fracture angle of the left side overlying strata in the 21102 working face is 58°,the fracture angle of the right side overlying strata is 62°,the fracture angle of the left side overlying strata in the 21201 working face is 56°,and the fracture angle of the right side overlying strata is 59°.After the excavation of the working face,the overlying strata collapses or sinks and moves in sequence,which is basically consistent with the surface monitoring results.The research results can provide a reference for the safe mining of deeply buried mining faces with double coal pillars.
Double coal pillarsSimilar simulation testSurface subsidenceKey stratumOverlying strata movement
万方数据
维普
