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为了优化防冲设计,实现安全高效开采,采用FLAC数值模拟软件模拟了3上煤解放层的回采对3下煤的解放效果。结果表明:3上煤工作面巷道上下帮应力集中系数达3.3,切眼附近应力集中系数达3.4,工作面前方煤体内应力集中系数达3.5,垂直应力峰值区距工作面煤壁10 m左右;切眼附近走向卸压保护角为72°,工作面前方附近走向卸压保护角为76°,倾斜方向卸压保护角为85°。
In order to optimize the anti-impact design and achieve safe and efficient mining, FLAC numerical simulation software was used to simulate the liberation effect of coal mining on 3 under coal mining. The results show that: (1) the upper and lower stress concentration coefficients are up to 3.3, the stress concentration factor near the cut eye is up to 3.4, the stress concentration coefficient in front of working face reaches 3.5, and the vertical stress peak area is about 10 m away from the coal wall in coal face; In the vicinity of the cut eye, the pressure relief protection angle is 72 °, pressure relief angle is 76 ° near the front of working face, and pressure relief angle is 85 ° in the inclined direction.