Numerical simulation of gas drainage along bedding based on Lattice Boltzmann Method

According to the Lattice Boltzmann Method computing technique and the corresponding percolation theory, the percolation problem of gas flow inside fractured coal body under the condition of gas drainage along bedding was simulated, and the gas pressure distribution in space was further researched as well. Pressure distribution and average pressure in the gas flow were seen as the basis for evaluation of drainage efficiency. The results showed that the gas pressure distribution and drainage efficiency were connected with drainage hole length, drainage hole spacing, negative pressure of drainage and drainage time step. Besides, drainage hole length and spacing influenced the gas pressure distribution comparatively serious, which tallied with the existing theoretical analysis and experimental results. Industrial experiment was carried out in the pre-drainage workface. In this experiment, the actual efficiency was tested by changing the negative pressure of drainage. The results indicated that the LBM technique would provide a new approach of researching the gas flow rules in coal seam under the condition of gas drainage, which have a greater significance to gas drainage.