煤层透气性系数的优化和简化计算方法

煤层透气性系数是用以考察保护层开采效果和设计瓦斯抽采系统的重要参数之一,钻孔径向流量法是求取该系数最常用的算法。利用理论推导和图形分析方法,探讨流量准数、时间准数、煤层透气性系数与参数A,B间的关系。在此基础上,针对科研工作和现场管理的实际情况,提出求解透气性系数的2种新算法及其算法流程,并对时间准数-参数A,B函数关系中的间断点问题进行讨论和分析,解决此区间内求解透气性系数相应计算公式等问题。理论和实例分析表明:算法1在不更改最终计算公式和结果的前提下,省去了繁琐的试算过程,既保证了可靠性也优化了计算流程;算法2以稍减精度的代价对计算流程进行进一步的简化,其结果仍有较高精度。

An Optimized Algorithm and a Simplified Algorithm for Solving Gas Seepage Coefficient of Coal Seam

The gas seepage coefficient of the seam is one of the most important parameters for examining the exploitation efficiency of the protective coal seam and designing the gas extraction system,and a main disadvantage of the radial flow method,the most common method for solving the coefficient,is time-consuming.The relations between the dimensionless flow criterion,the dimensionless time criterion,the gas seepage coefficient and parameter A,B were investigated.Aimed at two situations of scientific research and site management,two corresponding algorithms and their calculation process were developed.The discontinuity points in the functional curve between the dimensionless time criterion and parameter A,B were discussed and analyzed.The results show that the first algorithm,an optimized algorithm,can cut out the tedious trial process and maintain the accuracy of the result,and that the second algorithm,a simplified algorithm,has advantages of being a very simple calculation process and having smaller errors.