四川矿区典型煤层地应力场瓦斯渗透性规律实验研究

Experimental Study on Gas Permeation Law in Typical Coal Seam Stress Field in Sichuan Coal Mining Area

在深部开采或复杂地质条件下,地应力对煤岩渗透率的影响明显,进而影响煤矿瓦斯抽采的效果。对四川矿区不同典型煤层条件下的原煤进行了实验研究,分析矿区典型地应力特征条件下煤岩渗透率的变化规律,拟合了煤岩渗透率与有效应力的函数关系模型。研究发现:煤岩的渗透率与有效应力呈规律性的反比例关系,并存在拐点。这一发现为该矿区根据地应力条件进行煤层强化增透措施选取提供了依据,该研究成果在四川矿区白皎煤矿的保护层开采应用中取得了较好的效果,瓦斯抽采效果良好。

Under the deep mining and complicated geological conditions, the strata stress has significant influence on the coal permeability, thereby affecting the gas drainage effect. In this paper, experimental study was made on the raw coal taking from different typical coal seams in Sichuan mining areas, analysis was carried out on the change regularity of coal permeability under the condition of the typical strata stress characteristics and the functional correlation model of the coal permeability and effective strata stress was fitted. It was found out in the study that the coal-rock permeability presented a regular inverse proportion with the effective stress and there was an inflection point. This discovery provided basis for the selection of permeability enhancement measures of coal seams according to strata stress conditions. This research result has obtained better application effect in protective layer mining in Sichuan Baijiao Coal Mine and the gas drainage effect is also good.