近水平上保护层开采覆岩破坏规律数值模拟研究

发布时间：2018-06-22 19:01

  本文选题：近水平煤层 + 上保护层　； 参考：《煤炭工程》2017年05期

【摘要】：为确保近水平高瓦斯松软低透煤层安全高效开采,以大湾煤矿西井X10901工作面为研究对象,利用FLAC~(3D)数值模拟软件对上保护层开采覆岩的应力变化规律、破坏情况以及被保护层的变形分布规律进行研究,并结合现场开展了保护效果考察认证。结果表明:采场周围覆岩在整个开挖过程中经历了由原始应力区转化为应力集中区、卸压区、稳定区和重新压实区的变换过程;上保护层开采所形成的卸压区域随工作面的推进从"V"形过渡至"U"形逐渐增大。经保护层开采后,被保护层的最大膨胀变形量可达12.2mm(相对膨胀变形4.52‰),并在竖直方向上形成了覆岩"三带"分布和底鼓分布;结合现场保护效果考察得知,上保护层开采后被保护煤体得到了充分保护,最大限度地消除了煤与瓦斯突出危险,为矿井安全高效奠定了重要的基础。
[Abstract]:In order to ensure the safe and efficient mining of high level high gas soft and low permeable coal seam, taking X10901 face of West well of Dawan Coal Mine as the research object, the stress variation law of overburden mining in upper protective layer mining by using FLAC~ (3D) numerical simulation software is used. The damage and deformation distribution of the protected layer were studied, and the protection effect was investigated and certified. The results show that the overburden around the stope experienced the transformation process from the original stress zone to the stress concentration zone, the pressure relief zone, the stable zone and the re-compaction area during the whole excavation process. The pressure relief area formed by the mining of the upper protective layer gradually increases with the advance of the working face from "V" shape to "U" shape. After mining the protective layer, the maximum expansion deformation of the protected layer can reach 12.2mm (relative expansion deformation 4.52 鈥，

本文编号：2053896