不同含水率煤样瓦斯渗流特性的实验研究

Experimental study on gas seepage characteristics of coal samples with different water contents

为了研究含水率对煤样瓦斯渗流特性的影响规律,以黑龙江龙煤集团某煤矿煤样制备的型煤试件为研究对象,采用自制渗流实验装置,对不同含水率煤样在相应外部应力、瓦斯压力条件下的瓦斯渗透特性进行实验研究,分析了水-力耦合作用下含瓦斯煤渗透率演化规律。结果表明:瓦斯压力和外部应力相同情况下,渗透率与含水率呈负变关系;相同瓦斯压力条件下,煤样渗透率与外部应力呈负变关系;当外界应力恒定时,渗透率随着瓦斯压力的增大先减小后增大。该研究对瓦斯灾害治理及煤层气开采具有参考价值。

This paper aims to investigate the law underlying the water content influence on the gas seepage characteristics of coal samples.The study involves performing the gas seepage characteristics experimental research on coal samples with different water content under the corresponding external stress and gas pressure conditions by taking the briquette samples prepared from coal samples from a coal mine of Heilongjiang Longmei Group as research objects and using the self-developed seepage experimental device;and analyzing the law behind the permeability evolution of gas-containing coal samples under the coupling of water and force.The results point to a negative change relationship between the permeability and water content under the same conditions of gas pressure and external stress;a negative change relationship between the permeability of coal samples and external stress under the condition of the same gas pressure;and an initial decrease and subsequent increase in the permeability with the increase of gas pressure,under a constant external stress.The study could inform gas disaster management and coalbed methane extraction.