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利用FLAC3D数值模拟软件模拟分析了切顶巷区域的应力状态特征。结果表明:回风巷下帮与瓦斯巷之间垂直应力较高,而水平应力则在回风巷底板和下帮集中较明显,切顶巷区域应力也明显集中,冲击危险性上升;为了避免两个相邻切顶巷形成叠加应力集中区,两切顶巷间距应不低于20 m,间距可设置为20~50 m。
The FLAC3D numerical simulation software was used to simulate and analyze the stress state characteristics in the top of gateway. The results show that the vertical stress between the lower part of return airway and gas lane is higher, while the horizontal stress is more obvious in the bottom plate and lower part of return airway, and the stress in the area of top-cut roadway is also obviously concentrated and the impact risk increases. In order to avoid Two adjacent top lanes form superposition stress concentration zone. The distance between two top lanes should not be less than 20m, and the spacing should be set between 20 ~ 50m.