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运用FLAC3D数值模拟软件对首采区应力进行了数值模拟,巷道两帮应力集中程度较高,高于垂直应力;巷道底部岩层交界面及两侧边缘位置应力集中程度特别高,顶板两侧肩角应力集中程度明显,容易切顶冒落;巷道顶、底板5 m左右水平应力高度集中。分析得到顶板岩层的运移规律:当工作面沿断层边缘或者朝向断层方向开采,临近断层侧超前支撑压力与原岩构造应力叠加强烈,矿压显现将明显增加。
The stress of the first mining area was numerically simulated by FLAC3D numerical simulation software. The concentration of stress in both sides of the roadway was higher than that of the vertical stress. The stress concentration at the interface and sides of the rock strata at the bottom of the roadway was particularly high. Stress concentration is obvious, easy to cut the roof; road top, bottom 5 m horizontal stress is highly concentrated. The roof strata migration rule is analyzed. When the working face is mined along the edge of the fault or toward the fault, the advance support pressure near the fault side is superposed with the tectonic stress of the original rock, and the occurrence of mine pressure will be obviously increased.