软、硬煤残余瓦斯含量差异性研究

针对具有软煤分层的突出煤体,为了更加准确地检验瓦斯抽采效果,必须研究瓦斯抽采后软、硬煤残余瓦斯含量之间的差异性.基于抽采条件下的瓦斯渗流场分析,考虑了煤层中存在软煤条件下对瓦斯流动及煤层的综合影响,通过建立瓦斯流固耦合方程,并结合钻孔抽采瓦斯的初始条件和边界条件,运用多物理场耦合分析软件模拟了抽采条件下软、硬煤的残余瓦斯含量的差异性.数值模拟结果表明:在相同的抽采时间内,软煤的残余瓦斯含量始终高于硬煤,软煤瓦斯含量降到8 m3/t需要180 d,硬煤瓦斯含量降到8 m3/t需要162 d.

Study on Residual Gas Content Diversity Between Soft and Hard Coal

For extrude coal seam with soft coal， in order to inspect more accurate gas drainage effect， residual gas content diversity between soft and hard coal must be studied. Based on gas seepage field analysis of drainage conditions， considering the comprehensive influence of the condition of soft coal on gas flow and coal seam in coal seam， through establishing the gas fluid-structure coupling equation， and combining with the initial conditions and boundary conditions of borehole gas drainage， the differences of residual gas content of soft and hard coal under the extraction condition was simulated by using the multi-physic fields coupling analysis software. The results of numerical simulation showed the residual gas content of soft coal is higher than one of hard coal under the same extraction time. It will take 180 days when gas content of soft coal is reduced to 8m³/t， but it takes 162 days for hard coal.