Analysis of solid gas coupling model and simulation of coal containing gas
Based on basic solid and gas coupling theoryfrom the basic definition of the porosity and permeabilityconsidering Klinkenberg effect and gas adsorption swelling effect on gas transportation in coalthe porosity modelthe dynamic permeability modeland gassolid coupling model were established
finally.The numerical simulation results in natural discharging conditions indicate that porosity gas pressure reduces with the decreases of duration of pressure natural dischargingpermeability and porosity of coal enhances as pressure natural discharging duration increaseswhich is similar
to permeability test rule in the spot.From the depths of the coal mining to working faceporosity and permeability increases slowly at beginningthen droops dramaticallyat last increases sharply.
Keywords: Klinkenberg effect; coal containing gas; gas adsorption; numerical analysis; solidgas coupling; swelling effect
Document Type: Research Article
Publication date: 15 December 2012
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