大倾角煤层群开采岩移规律数值模拟及复杂性分析

Numerical Simulation and Complexity Analysis of Strata Movement in Exploiting Steep Coal Seams Group

采用数值计算软件FLAC3D对东峡煤矿大倾角煤层群走向长壁开采进行了数值计算,并结合现场监测进行了对比分析,总结了工作面开采围岩移动的规律性和复杂性.结果表明,在大倾角煤层群开采时,无论是围岩应力还是岩层运移都表现出与单一大倾角煤层不同的特征,变化现象趋于复杂,上层煤开采不仅影响了上覆岩层的运移规律,而且对下层煤产生了扰动,影响了下层煤开采,其主要表现为上层煤开采的卸载扰动和支架、采空区垮落体的加载扰动.研究结果为现场开采实践提供了科学依据.

The mechanical characteristic of exploiting steep coal seams group face with longwall mining along the strike in Dongxia mine was simulated by using of FLAC3D software. Compared with in-site test, the strata movement behavior and complexity were also summarised.The results indicates that 1） the stress of surrounding rocks and the strata movement in steep coal seams group are more complex than in the steep single-layer seam, and 2） mining upper coal seam will affect not only the movement of overlying strata, but also the mining of lower coal seam, which is the unloading disturbance caused by mining upper coal seams and the loading disturbance caused by hydraulic power support and gob falling body. This result can provide a scientific support for engineering practice.