含断层煤层群开采围岩应力演化规律研究

采用FLAC3D数值模拟分析煤层开采过程中邻近煤岩体及断层应力分布特点、裂隙发育演化规律、及煤岩层卸压范围。结果表明:切眼、工作面前方、断层面和断层端部均出现不同程度的应力集中现象。当工作面推进距断层一定距离时,采空区上下方邻近煤层卸压瓦斯大量运移并集中在开采空间。断层面应力与工作面应力区叠加贯通,达到应力最大值,此时应对该范围内的瓦斯进行合理的抽采,避免裂隙带形成的瓦斯积聚造成瓦斯突出。

Study on Stress Evolution Law of Surrounding Rock in Mining Coal Seam Group with Fault

FLAC3 Dnumerical simulation was used to analyze the distribution characteristics of stress in proximity fault,coal and rock mass,evolution law of fracture development, the released range of coal and rock seams during seam mining. The results showed that the stress concentration appeared in the open hole, the front of the working face, the fault plane and the end of the fault. When the working face advances a certain distance from the fault, a large amount of pressure relief gas in the adjacent coal seam above and below the goaf moves and concentrates in the mining space. The stress of fault plane is superimposed with the stress area of working face to reach the maximum stress.At this time, the gas within this range should be reasonably extracted to prevent the gas accumulation caused by the fracture zone from causing gas protrusion.