Simulation Study on the Characteristics of Gas Extraction from Coal Seams Based on the Superposition Effect and Hole Placement Method

In order to obtain a reasonable extraction drilling method for coal seam working faces and carry out targeted as well cost-effective hole placement optimization, gas–solid coupled model based on the rock deformation field matrix–fissure dual seepage–diffusion was established numerically solved via use of COMSOL Multiphysics finite element software optimize gas transport parameters Dongpang mine study law. This shows following: With an increase in time, content reduced minimum. It that, with pressure seepage velocity keep decreasing stable value, main stress around borehole redistributes, permeability keeps decay coefficient. The radius boreholes increases exponentially size is 94 mm; multiple pre-drawing interval between effective influence results blind zone caused by superposition effect boreholes, residual value spacing. equilateral triangular layout can avoid zone, pre-sumping good after application, which ensures safe production mines resources.