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分析了测压气室长度、煤层透气性系数及注入测压气室内的气体种类对瓦斯压降曲线的影响,通过现场试验表明,测压气室长度越短,瓦斯压力曲线下降的越快,曲线稳定所需的时间越短;煤层的透气性系数越小,瓦斯压力曲线下降的越慢,瓦斯压力达到平衡所需的时间越长;测压气室内注入CO2气体瓦斯压降速率要大于注入N2时的速率。通过对各影响因素进行分析,能够为现场测压提供理论依据,从而提高工作效率。
The influence of pressure chamber length, coal seam gas permeability coefficient and the type of gas injected into the pressure chamber on gas pressure drop curve is analyzed. Field tests show that the shorter the pressure chamber length, the lower the gas pressure curve, the stable the curve The shorter the time needed is; the smaller the permeability coefficient of coal seam is, the slower the gas pressure curve decreases, and the longer the gas pressure needs to balance; the rate of pressure drop of CO2 gas injected into the pressure chamber is greater than that of N2 . Through the analysis of various factors, it can provide a theoretical basis for on-site manometry and improve work efficiency.