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为了定量研究上行开采条件下单一煤层和多煤层开采的覆岩破坏规律,利用FLAC3D数值模拟软件,分别对麦垛山煤矿仅开采6煤和先开采6煤后开采2煤两种情况下覆岩破坏规律进行了研究,结果表明:仅开采6煤时,弯曲下沉带主要发育在地表以下491.02 m,导水裂缝带发育高度为51.70 m,地表下沉值为94.00 mm;先开采6煤后开采2煤时,弯曲下沉带主要发育在地表以下380.00 m,6煤导水裂缝带发育高度为59.00 m,地表下沉值为375.00 mm。上行开采对于下部煤层6煤导水裂缝带发育高度影响不大,由于上部煤层2煤导水裂缝带的发育,导致弯曲下沉带范围缩小,地表下沉值由于上部煤层2煤的开采而显著增大。
In order to quantitatively study the rule of overlying strata failure in single coal seam and multi-seam mining under the condition of the ascending mining, FLAC3D numerical simulation software was used to mine only 6 coal in the Maihushan coal mine and 6 coal in the first, The results show that when only 6 coal is mined, the bending subsidence zone mainly develops below 491.02 m below ground surface, the development height of water-conducting fracture zone is 51.70 m and the surface subsidence value is 94.00 mm. After 6 m coal mining When 2 coal is mined, the bending sink zone mainly develops 380.00 m below the surface, the development height of 6 water-conducting fractures is 59.00 m, and the surface subsidence value is 375.00 mm. Upward mining has little effect on the development height of the 6th hydraulic conductivity fractured zone in the lower coal seam. Due to the development of the 2nd hydraulic conductivity fractured zone in the upper coal seam, the range of the bend sinking zone is narrowed and the surface subsidence value is significant due to the 2 nd coal mining in the upper coal seam Increase.