A simulation of gas migration and control in goaf based on multi-components LBM

Gas migrating in goaf and congregating in upper corner result in gas over limit in upper corner which greatly influences coal mining safety. To explore the cause of upper corner gas over limit and control it, this paper provides Lattice Boltzmann Method (LBM) simulation of gas migration and control in goaf of fully mechanized coal caving mining face. After analyzing the characteristics of goaf, a control equation system which reflects the characteristics of gas migration law in goaf of fully mechanized coal caving mining face is put forward. A multi-components LBM is used to solve the complex control system. Two Lattice Boltzmann Equations (LBE) are constructed to simulate the atmosphere and gas seepage velocity field respectively. By the evolution of these two LBEs, simulation results are gained. A case study showed: This method can combine time, space and system action together. It can simulate and analyze acutely the situation of gas migration in direct condition and provide an alterable method to reveal and control gas migration in underground coal mine.