多煤层开采顶板导水裂隙带发育高度模拟分析研究

Simulation Analysis of Development Height of Roof Water Conduction Fracture Zone under Multi-coal Seam Mining Conditions

针对由顶板覆岩破坏而导致的矿井水害问题,以A煤矿一、二水平工作面为工程背景,采用力学理论分析与数值模拟等方法,分析了该煤矿多煤层开采条件下导水裂隙带发育高度特征,探讨了9号煤层回采不同距离时覆岩运移特征。结果表明:在4+5号及8号煤层回采结束后的重复采动过程中,9号煤层导水裂隙带与8号煤层贯通;9号煤层斜长200 m,工作面割煤回采引起导水裂隙带发育高度约为144.95 m,对8号煤层导水裂隙带发育高度影响不明显,对4+5号煤层导水裂隙带发育高度造成一定影响。对复杂开采条件下顶板导水裂隙带发育高度的研究,对指导矿井安全生产,防治矿井水害有着重要的现实意义。

In order to solve the problem of mine water hazard caused by the failure of roof overburden,taking the first and second horizontal working faces of A Coal Mine as the engineering background,the development height characteristics of the water conduction fracture zone under the mining conditions of multiple coal seams in the coal mine were analyzed by using mechanical theory analysis and numerical simulation,and the migration characteristics of overburden at different distances of coal seam mining in 9#coal seam were discussed.The results showed that during the repeated mining process after the completion of 4+5#and 8#coal seams,the water conducting fracture zone of 9#coal seam was connected to 8#coal seam.The inclined length of 9#coal seam was 200 m,and the height of water conducting fracture zone development caused by coal cutting and mining in the working face was about 144.95 m.The impact on the height of water conducting fracture zone development in 8#coal seam was not significant,but it had a certain impact on the height of water conducting fracture zone development in 4+5#coal seam.The study on the development height of roof water conducting fracture zones under complex mining conditions has important practical significance for guiding mine safety production and preventing mine water hazards.