主动式测压瓦斯压降曲线的影响因素分析

Analysis on Influence Factors for Gas Pressure Decline Curve of Active Pressure Measurement

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。

In this paper,it analyzed the influence factors on gas pressure decline curve such as the length of manometry gas chamber,coal seam gas permeability coefficient and gas species injected into manometry gas chamber.The field test showed that the shorter the length of manometry gas chamber,the faster the gas pressure curve decline,and the shorter time required for the curve stable;The smaller the coal seam gas permeability coefficient,the slower the gas pressure curve decline,then the longer time required for gas pressure balance;The gas pressure decline rate of injecting CO2 was greater than the rate of injecting N2 in manometry gas chamber.Theoretical basis could be provided for the field pressure measurement through the analysis of each influence factor,thus the work efficiency was improved.