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地下煤矿工作面上隅角瓦斯积聚并超限是煤矿生产的重大安全隐患。为了解瓦斯积聚规律及瓦斯积聚量,构建了采场统一的三维LBM仿真模型,并开发采场瓦斯运移的三维LBM仿真软件。采场由工作面和采空区2个流场组成,其中,瓦斯与大气混合气体在工作面流场中的运动为紊流运动,而在采空区内的运动为非均质多孔介质的渗流运动。采场统一的LBM仿真模型通过采用不同的松弛时间和平衡分布函数来体现2个流场的特征。由于采场结构复杂,为了提高运算效率,采用分块耦合算法将采场划分成多个块,各块独立并行计算,块与块之间通过耦合交换数据,最终实现整个采场瓦斯运移仿真。模拟实例表明,该方法可以模拟和分析采场瓦斯运移状况,并得到采场瓦斯运移的相关数据。同时也可以得到采场流线分布规律、速度变化规律和采空区瓦斯运移规律。
Gas accumulation and overrun in the upper corner of the underground coal mine face is a major safety hazard in coal mine production. In order to understand the law of gas accumulation and gas accumulation, a unified three-dimensional LBM simulation model for stope was constructed and a three-dimensional LBM simulation software was developed for gas migration in stope. The stope consists of two flow fields in the working face and the goaf. Among them, the movement of gas mixture with gas in the working face is turbulent, while the movement in the goaf is heterogeneous porous media Seepage movement. The stochastic LBM simulation model of the stope reflects the characteristics of the two flow fields by using different relaxation times and equilibrium distribution functions. Due to the complicated structure of the stope, in order to improve the computational efficiency, the stope coupling algorithm is used to divide the stope into several blocks. The blocks are independently and parallelly calculated. The data are exchanged between the blocks and blocks to achieve the simulation of the entire stope gas migration . The simulation results show that this method can simulate and analyze the gas migration in the stope and obtain the relevant data of gas migration in the stope. At the same time, the law of streamline distribution, the law of speed variation and the gas migration rule in goaf can also be obtained.