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以登封矿区某综放工作面承压水上开采为工程背景,利用数值模拟分析了煤层开采过程中底板应力、位移变化及塑性区分布情况。模拟结果表明:顶板初次来压期间,靠近工作面端头附近容易发生突水;煤层开采过程中,底板变形经历压缩→膨胀→压缩过程。距离煤层较近的L9灰岩可能对煤开采构成突水危险,距离煤层较远的奥陶系灰岩承压含水层对煤层安全开采危险不大。
Taking the confined water mining in a fully mechanized caving mining face in Dengfeng mining area as the engineering background, the floor stress and displacement and the distribution of plastic zone during the coal mining process were analyzed by numerical simulation. The simulation results show that water inrush easily occurs near the head near the working face during the initial compression of the roof. In the process of coal seam mining, the deformation of the soleplate undergoes compression → expansion → compression. L9 limestone, which is closer to the coal seam, may cause water inrush hazard to coal mining. The pressure aquifer of Ordovician limestone that is farther away from the coal seam is less dangerous for coal seam safety mining.