煤层变形与瓦斯运移耦合系统的数值响应

Numerical Response of Coal Seam Deformation and Gas Migration Coupled System

为了揭示煤炭开采过程中煤层变形运动与瓦斯运移之间存在的复杂耦合作用,以煤层孔隙度和瓦斯压力为桥梁建立了煤层变形运动与瓦斯在煤层中运移的耦合动力学模型.通过理论分析和计算机编程模拟研究了低瓦斯煤层、高瓦斯非突出煤层和高瓦斯突出煤层变形与瓦斯运移的耦合运动,给出了煤层渗透率分布曲面图以及瓦斯流量的时间历程曲线.计算结果表明,所模拟的低瓦斯煤层中瓦斯运移不发生失稳,且瓦斯涌出量的稳定值在0.2 m3/min以下;高瓦斯非突出煤层中瓦斯的运移也不会发生失稳,但是瓦斯涌出量的稳定值大于4.8 m3/min;高瓦斯突出煤层中瓦斯的运移发生失稳.基于显式快速Lagrange算法编程计算的煤层变形与瓦斯运移耦合系统数值响应与实际相符.

In order to reveal the complex coupling effect between the coal seam deformation and the gas migration during coal mining,a dynamic model named coal seam deformation and gas migration coupled system is established based on porosity and gas pressure.Theoretical analysis and numerical simulation with computer programming are respectively used to study the motion of low-gas coal seam,high-gas coal seam,and outburst coal seam The permeability distribution and the time history plot of gas emission were given.The result of numerical calculation shows that the coal seam deformation and gas migration instability will not take plce in both the low-gas coal seam and the high-gas coal seam.The stable values of gas emission are 0.2 m3/min and 4.8 m3/min,respectively.The system is instable in the outburst coal seam as the gas emission keeps increasing.The numerical response results of the coupled system based on the explicit fast Lagrange with computer programming are close to the practice.