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为分析硬质体构造对煤巷掘进工作面瓦斯压力分布的影响,运用含气-固耦合分析模块的岩石破裂过程分析有限元软件建立正常煤层掘进和含硬质体构造煤层掘进两种物理力学模型,对两种煤巷掘进工作面前方煤体应力和瓦斯压力分布规律进行数值模拟。结果表明,硬质体构造的存在增加了掘进工作面前方煤体的应力集中范围和应力梯度,进一步降低了煤层的透气性,阻碍了工作面深部煤体瓦斯向自由面的正常运移,进而形成了高瓦斯压力梯度。高瓦斯煤层掘进工作面硬质体地质构造直接影响煤巷掘进工作面地应力的分布,间接地影响瓦斯压力的分布。
In order to analyze the influence of hard structure on gas pressure distribution in coal heading face, finite element software is used to establish two kinds of physical mechanics of normal coal seam driving and hard rock bearing coal seam tunneling using gas-solid coupling analysis module Model to simulate the distribution of stress and gas pressure in front of two kinds of roadway coal face. The results show that the presence of hard structures increases the stress concentration range and stress gradient of the coal body ahead of the heading face, further reducing the permeability of the coal seam and hindering the normal movement of the deep coal seam gas to the free surface in the working face. A high gas pressure gradient is formed. The geological structure of the hard gas body in the driving face of the high gas coal seam directly affects the distribution of the earth stress in the heading face and indirectly affects the distribution of gas pressure.