上保护层开采底板破坏深度和应力分析研究

上保护层开采导致的底板变形、应力释放会使被保护层内高瓦斯沿着上覆岩层内形成的空隙裂隙结构向上运移，很容易造成所采工作面采空区内瓦斯增加，造成工作面瓦斯超限。以峰峰集团以黄沙矿为研究实例，针对其主采的2号煤层利用FLAC^3D模拟软件进行上保护层开采底板应力研究，揭示了上保护层开采底板应力的规律特性，对于保护层开采工作瓦斯治理具有一定的指导意义。

Study on failure depth and stress analysis of mining floor in upper protective layer

The deformation and stress release of the floor caused by the mining of the upper protective layer will make the high gas in the protected layer move upward along the gap and fracture structure formed in the upper overburden layer,which is easy to cause the gas increase in the goaf of the working face and cause the gas in the working face to exceed the limit.Taking Huangsha Mine of Fengfeng Group as an example,in view of the No.2 coal seam,the FLAC 3D simulation software is used to study the mining floor stress of the upper protective layer,revealing the regularity characteristics of the mining floor stress of the upper protective layer,which has certain guiding significance for the gas control of the mining work of the protective layer.