下伏煤岩体移动变形规律数值模拟研究

Numerical Simulation Research on Movement and Deformation Law of Underlying Coal and Rock Mass

为探究保护层开采后应力和煤层变形量分布规律,通过FLAC^(3D)数值模拟软件,以正在进行开采工作的保德煤矿8#煤层群为研究对象,分别对8#煤开采过程中走向和倾向的煤层变形量以及应力场的演化规律进行分析。研究结果表明:随着工作面的推进,工作面四周煤岩体应力集中越来越明显,下伏煤岩体的卸压效果也越来越显著,而且煤层走向和倾向上的应力集中均主要表现在z方向,对水平应力的影响较小;当工作面回采距离增加时,下伏煤层的走向相对变形量由倒V形分布变为M形分布,倾向相对变形量由倒U形分布变为M形分布。

In order to explore the distribution law of stress and coal seam deformation after the mining of protective layer, taking the Baode coal mine No.8 coal seam group under mining as the research object through FLAC^(3D) numerical simulation software, the coal seam deformation of strike and tendency and the evolution law of stress field in the process of No.8 coal mining are analyzed respectively. The results show that with the advance of the working face, the stress concentration of the coal and rock mass around the working face is more and more obvious, and the pressure relief effect of the underlying coal and rock mass is more and more obvious. Moreover, the stress concentration on the strike and tendency of the coal seam is mainly in the z direction, which has little effect on the horizontal stress;when the mining distance of the working face increases, the strike relative deformation of the underlying coal seam changes from inverted V-shaped distribution to M-shaped distribution, and the tendency relative deformation changes from inverted U-shaped distribution to M-shaped distribution.