论文部分内容阅读
提前掌握瓦斯压力测定所需时间,对准确高效地测定煤层瓦斯压力非常重要。以被动式岩巷测压为例,在初步分析测压钻孔周围煤体初始瓦斯压力分布规律、游离瓦斯与吸附瓦斯的关系、瓦斯流量衰减规律及瓦斯流场平衡条件的基础上,从理论上推导出瓦斯压力测定时间计算公式。将该公式与现场瓦斯压力测定监测数据进行对比分析,并研究瓦斯压力测定时间的影响因素。结果表明,理论分析结果与现场瓦斯压力测定情况基本一致,测压时间的误差仅为6%;改变测压钻孔初始气体压力(主动式测压)是唯一有实用价值的方法。
It is very important to know the time required for gas pressure measurement in advance and accurately and effectively measure the gas pressure in coal seam. Taking passive rock pressure measurement as an example, based on the preliminary analysis of the initial coal gas pressure distribution around the borehole under pressure measurement, the relationship between free gas and adsorbed gas, the attenuation law of gas flow and the equilibrium conditions of gas flow field, Derive the calculation formula of gas pressure measurement time. This formula is compared with on-site monitoring data of gas pressure measurement, and the influencing factors of gas pressure measurement time are studied. The results show that the theoretical analysis results are in good agreement with the gas pressure measurement at the scene, and the error of the pressure measurement time is only 6%. Changing the initial gas pressure of the pressure measurement borehole (active pressure measurement) is the only practical value method.