厚煤层采动覆岩变形特征及瓦斯运移规律分析

矿井瓦斯是在煤的变质和煤的生成过程中伴生的一种气体，是影响矿井安全开采的主要因素。采用理论分析和数值模拟相结合的方法，对厚煤层采动覆岩变形特征及瓦斯运移规律进行了研究，分析了厚煤层采动覆岩变形特征、瓦斯在裂隙带中的扩散计算方程以及不同高度时和不同走向区域时瓦斯压力和流场分布规律。研究得出:切眼裂隙区的瓦斯浓度高于压实区的瓦斯浓度，在空间上瓦斯浓度呈“回型”分布；瓦斯在边界离层裂隙带进行集聚，在竖直方向上瓦斯浓度呈“马鞍型”分布。研究为钻孔合理层位的选择提供了理论支持，确保了矿井的安全生产。

Analysis on deformation characteristics and gas migration law of overburden strata in thick coal seam

Mine gas is a kind of gas associated with coal deterioration and coal generation，and is the main factor that affects mine safety mining.The deformation characteristics and gas migration laws of mining overburden in thick coal seam were studied by means of theoretical analysis and numerical simulation，the deformation characteristics of mining overlying rock in thick coal seam，the diffusion calculation equations of gas in fracture zone and the distribution laws of gas pressure and flow field at different height and direction are analyzed.The results show that the gas concentration in the fissure area is higher than the gas concentration in the compaction area，and the gas concentration in space is"return type"distribution，gas accumulates in the boundary rift zone，and the gas concentration is"saddle type"in the vertical direction.The research provides theoretical support for the selection of reasonable level of drilling and ensures the safe production of mine.