Development law of overlying rock two zones on ultra-long working face of Yuandatan Coal Mine
According to the development law of overburden two zones under the influence of ultra-long working face mining,the distribution characteristics and development law of the two zones of overburden rock are studied by combining theoretical analysis and discrete element 3 DEC numerical calculation software based on the background of the working face of Yuanda-tan Coal Mine.The research results show that:According to the results of theoretical calculation,the development heights of the two belts of the two empirical formulas under different mining heights of the working face of No.2 coal seam are ob-tained,and the law that the height of the water-conducting fracture zone in the working face gradually increases with the in-crease of mining height,but the increasing range of the fracture height gradually decreases.Through 3DEC numerical simula-tion analysis,it is found that the height of the water-conducting fracture zone increases by 2.01～3.05 m for every 0.2 m increase in the mining height of 11207 ultra-long working face.The greater the mining height of 11207 ultra-long working face,the smaller the increase in the height of fracture development.The results obtained by numerical simulation are basical-ly consistent with those obtained by theoretical calculation.In the actual mining process of the working face,the mining height of the working face gradually decreases,the development height of the fracture zone gradually decreases,the displace-ment of overlying rock gradually decreases,and the concentrated stress gradually weakens.Therefore,it is necessary to strengthen monitoring and enhance protective measures in the initial stage of mining.
ultra-long working facewater-conducting frac-ture zonecaving zone heightfully mechanized caving miningnumerical simulation
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