Numerical Simulation Research on Time-Varying Law of Pressure Relief Gas in High Permeability Zone Affected by Mining Height of Fully Mechanised Mining Face in High Gassy Thick Coal Seam

Abstract

An investigation into the fully automated mining face pressure relief gas in the high permeability zone with high gas and thick coal seam was made in order to determine the time-varying law of the mining height effect. To explore the separations of fracture fields during mining, a two-dimensional physical similarity simulation experiment was conducted. And the identification criteria for pressure relief gas in high permeability zones were established. The 3DEC numerical simulation software was utilised to construct a numerical model of the working face. Subsequently, a systematic analysis was made through numerical simulation experiments to examine the progression of crack generation and development. In addition, the form of gobs under various mining heights was symmetrically terraced because the changes in stress peak values and subsidence under various mining heights throughout the mining operation were scrutinised. By doing so for the underlying rock. A model was created to probe how mining height could affect the pressure relief gas in the high permeability zone. The purpose of doing so was to look into the relationship between the permeability coefficient of the pressure relief gas high permeability zone and the mining height of mining face in a high gas thick seam of coal..

Keywords: Mining height effectPressure relief gas high permeability zone3DEC numerical simulationStress peak valuesPermeability coefficient