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Received: 15 March 2019 Accepted: 17 May 2019 With the depletion of shallow coal resources, more and more coalmines are exploiting coal from deep coal seams. Under the coupling of multiple stress fields, the migration of gas underground will increase the gas content and pressure in the coal seam. However, there is little report on numerical simulation of gas migration. To make up for this gap, this paper probes deep into the seepage process during gas drainage, explores the migration mechanism and distribution pattern of coal seam gas, and analyzes the gas migration mechanism on the multiphysics simulation software COMSOL Multiphysics. The research results show that: under the action of different stress fields, the gas seepage is related to water content of the coal seam. Before failure, the seepage rate is negatively correlated with water content. After failure, the negative correlation changed to positive correlation. Under the cyclic stress field, the seepage rate first decreased and then increased with the growth in the strain. The COMSOL Multiphysics simulation reveals that, with the increase in the drilling distance, the gas pressure around the borehole with seepage was greater than that without seepage. The research findings provide the theoretical basis and a mathematical model for the migration of gas seepage in deep coal seams.

Numerical Simulation of Migration and Distribution Law for Gas Seepage in Coal Seam