论文部分内容阅读
煤层透气性是瓦斯流动的基本参数之一,简单迅速而准确地测定煤层透气系数是一个重要的问题。中国若干矿井的生产实践表明,测量瓦斯压力钻孔中瓦斯压力的增长速度决定于煤层透气性、排放瓦斯的时间和钻孔的体积。应用电子计算机的计算和相似理论消除了排放瓦斯时间和钻孔体积因素的影响,导出了计算煤层透气系数的公式。 计算证明,这个公式优于与此相类似的苏联公式。如果没有水从煤层向钻孔流出,按照测定瓦斯压力钻孔的压力曲线用公式(12)计算煤层透气系数入是一个好方法。
Gas permeability of coal seam is one of the basic parameters of gas flow. It is an important issue to measure gas permeability of coal seam simply and quickly. Production practices in several mines in China have shown that the rate of increase of gas pressure in gas pressure boreholes depends on the gas permeability of the coal seam, the time of gas drainage, and the volume of the borehole. The calculation and similarity theory of computer are used to eliminate the influence of gas discharge time and volume of drilling and the formula to calculate the gas permeability coefficient of coal seam is deduced. Calculations show that this formula is superior to this similar Soviet formula. If there is no water flowing from the coal seam to the borehole, it is a good idea to calculate the permeability coefficient of the coal seam using Equation (12) based on the pressure curve of the gas pressure borehole.