采动煤岩体瓦斯渗透率分布规律与演化过程

Evolution of mining-induced enhancement and distribution of gas permeability in coal seam and surrounding rock

基于潘一矿煤田地质背景,以保护层开采为代表,开展相似模拟试验,通过Matlab软件实时捕获标记点位置并通过像素点演算其坐标,得到采场体积应变分布,可有效地反映采场膨胀-压缩变形分布。同时进一步开展全应力应变渗透试验,建立体积应变与渗透率的耦合关系方程,绘制采场的渗透率分布。研究发现随着工作面向前推进,体积膨胀变形与渗透率演化分布是一致的,上保护层渗透特性演化滞后于保护层,并且随着垮落区的形成与再压密,渗透率也逐渐减小,形成类蝌蚪状分布。

Based on the background geological information at Panyi Coal Mine, a physical simulation on protective seam mining was conducted in this study. The simulation obtained the volumetric strain distribution in the mining area through capturing the locations of the markers in real time and calculating the coordinates of pixels using Matlab soft- ware, which can effectively describe the distribution of expansion-compression in the mining area. Furthermore, a com- prehensive stress-strain permeability test was carried out with the establishment of coupling equation between volumet- ric strain and permeability. The study shows that with the advance of working face, the distribution of both volumetric strain and permeability also demonstrates a consistent tion of upper protective coal seam lags behind that in dynamic distribution process. However, the permeability evolu- the protective coal seam.