地电场对煤中瓦斯渗流特性的影响

The Influence of Geo-elecfric Field on Gas Seepage Properties in Coal

煤层中瓦斯的渗流性质要受到多种因素的影响。作者在实验室采用三轴渗流实验装置和电场实施装置研究了电场作用对煤中甲烷气体渗流性质的影响。实验研究结果表明 ,加电场后甲烷气体渗流速度比无电场时要大 ,并且渗流速度随压力梯度增大成线性增加 ;加电场后 ,煤中甲烷气体渗流量随电压 (电场强度 )升高近似成线性增大 ;煤化程度越高的煤导电性越好 ,甲烷气体在煤中的电动效应越明显 ;同时 ,加电场时 ,煤的等效渗透系数ke 可用解析式表达。

coalbed gas seepage properties will be affected by many factors. Gas seepage properties in coal are investigated under geo-electric field by triaxial compression and seepage test in this paper. The experimental results indicate that methane gas seepage velocity under geo-electric field is much larger than that under no geo-electric field and increase linearly with methane gas pressure gradient increasing and under geo-electric field, quantity of methane gas seepage in coal increases linearly with voltage (electric field strength) rising. And equivalent gas permeability ke in coal can be expressed with analytic function. The experimeutal study will have a foundation to further investigation of coalbed gas seepage and flow laws.