本煤层超前卸压瓦斯渗流规律的影响因素研究
Influencing Factors of Gas Seepage Flow in Advance Pressure Relief Area of a Mining Seam
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摘要: 针对工作面前方煤体应力的演化全过程设计了实验方案,开展超前卸压区瓦斯渗流实验,对实验数据进行了拟合,得到了煤样加载阶段和卸载阶段渗透率与垂直应力的拟合函数。根据新大地煤矿15201工作面现场实际情况,结合不同阶段煤样渗透率与垂直应力的拟合函数建立了数值计算模型,就工作面采高、采深对超前卸压区瓦斯渗流规律的影响进行了数值模拟研究。模拟结果表明:一方面,随着采高、采深的增大,超前支承压力的影响范围不断增大,且超前支承压力峰值位置不断远离工作面煤壁,工作面前方的高渗透率区域不断增大;另一方面,超前支承压力峰值随采高的增加不断减小,但随采深的增加不断增大。Abstract: Experimental schemes were designed for the entire evolution of the stress in the coal mass in front of the working face, and an experimental study on methane seepage from the coal mass in the advanced pressure relief area was conducted. Fitting functions for the permeability of the coal sample and its vertical stress were obtained by fitting the experimental data. A numerical calculation model was established with these fitting functions at different stages. The effect of mining height and mining depth on the law of methane seepage in the advanced pressure relief area was numerically simulated. With the increase of mining height and depth, the influence range of the advanced abutment pressure increased, and the peak position of the advanced abutment pressure moved away from the coal wall. However, the peak value of the advanced abutment pressure decreased constantly with the increase of mining height but increased with the increase of mining depth.
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