近距离煤层瓦斯涌出量影响因素之研究

Study on Gas Emission Factors of the Close Coal Seam

为提高近距离煤层采煤面瓦斯涌出量受邻近层影响程度的预测准确性,以西山矿区西铭矿48402工作面为例,通过对地应力、瓦斯分布、瓦斯含量、瓦斯抽采等方面的分析研究,根据该面相关实测参数,得出了影响瓦斯涌出量的因素主要是三个方面,即:顶底板应力变化引起的煤层瓦斯涌出量的变化、采空区内平均瓦斯含量随着距工作面距离增大而减小、采空区内瓦斯分布的状况对工作面瓦斯涌出量具有直接的影响。确定了今后开采8#煤层时,除对本煤层进行抽采外,还要对上邻近层施工高位孔,对下邻近层9#煤层施工底抽钻场的办法,为今后瓦斯综合治理提供了科学依据。

In order to improve the predictive accuracy of gas emission in the mining face of close coal seam by the adjacent layers influence degree, takes the 48402 face in Ximing mine of Xishan mining area as example, through analyzing ground stress, gas distribution, gas content, gas extraction and other aspects, based on the measured parameters of the face, obtains that the factors of impact of gas emission mainly are three aspects, namely the stress change in the roof and floor caused change of gas emission in the coal seam, the average gas content in the gob area decreases with increasing of the face distance, gas distribution status in goal has direct impact on the amount of gas emission. Determine the approach when in future the No. 8 coal seam would be mined, in addition to the coal seam extraction, but also on the upper adjacent layer construct high hole, No. 9 coal seam of the next adjacent layer construct bottom pumping drilling field, for future gas comprehensive control provides scientific basis.