卸压条件下含瓦斯煤层渗透特性试验

Experiment on permeability features of gassy coal under pressure relief condition

为研究含瓦斯煤层在不同卸压条件下的渗透率,对含瓦斯煤层在不同围压、不同瓦斯压力和不同卸压速率组合条件进行卸压试验,模拟地应力、瓦斯压力和开采强度影响下的含瓦斯煤层渗透特性。试验结果表明:在围压和卸压速率不变的情况下,瓦斯压力越大煤体瓦斯渗透率越高;在瓦斯压力和卸压速率不变的情况下,围压越大煤体瓦斯渗透率越低;在瓦斯压力和围压不变的情况下,煤体失稳破坏的进程随着卸压速率的增加而加快,渗透率随着卸压速率的增加而升高。

In order to study the permeability of gassy coal seam under different pressure relief condition,pressure relief tests were conducted on the gassy coal under different surrounding pressure,different gas pressure and different pressure relief speed combined condition to simulate the geostress,gas pressure and the gassy coal permeability features under the influence of mining intensity. The test results showed that under the condition of surrounding pressure and pressure relief speed unchanged,the higher surrounding pressure was,the higher coal gas permeability would be. Under the condition of gas pressure and pressure relief speed unchanged,the higher surrounding pressure was,the lower coal gas permeability would be. Under the condition of the gas pressure and surrounding pressure unchanged,the coal stability lost and failure process would be speeded up with the pressure relief speed rate increased and the permeability would be increased with the pressure relief speed rate increased.