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根据石圪节矿3#,8#及9#煤地质生产条件,3#煤火区与下组煤空间位置关系,应用理论计算、离散元法数值模拟研究了下组煤开采覆岩移动规律.研究表明,3#煤采动底板破坏深度为10.6 m,当煤层赋存稳定时,下组煤裂隙发育高度共45.43 m,小于层间距,下组煤与火区不会发生裂隙导通,而在切眼及停采线处覆岩裂隙发育较高,顶板“O-X”断裂圈边缘是火区主要导气通道,为此提出了加强火区封闭、重点区域监测监控、构造探测及9#煤工作面内错布置等针对性的保障措施,确保了下组煤的安全开采.
According to the geologic production conditions of No.3, No.8 and No.9 coal in Shek Kwu mines and the spatial relationship between No.3 coal seam and the lower coal group, the law of overlying strata movement was studied by using the theoretical calculation and discrete element method. The results show that the failure depth of mining floor of # 3 coal is 10.6 m. When coal seams are stable, the development height of coal fractures in the lower coal group is 45.43 m, which is less than the interval between layers. At the cut and stop line, the overburden rock development is very high. The edge of the roof “OX” fault zone is the main gas passage in the fire area. Therefore, it is proposed to enhance the closeness of the fire area, monitor and control the key areas, # Coal face the wrong layout and other targeted security measures to ensure the safe mining of the next group of coal.