Experimental And Theoretical Study On Transport Of Adsorbed Gas In Raw Coal And The Unstable Failure Of Gas-contained Coal

These paper not only focuses on desorption and transportation of absorbed gas contained inoriginal coal, but also focuses on this gas contained coal’s instability. It is clear that this containedgas and gas contained coal causes huge losses in deep underground coal mine engineering.Experimental and numerical studies were carried out to investigate the desorption andtransportation of adsorbed gas contained in original coal samples, the theoretical study on thestability of deep gas contained coal were also carried out. By the use of laboratory developed deepcoal sample temperature and pressure coupling test system, the experiments on desorption anddiffusion of absorbed gas under temperature and pressure coupling conditions were conducted.Reproduce the process of diffusion and desorption of adsorbed gas in rupture coal at differenttemperatures in the laboratory, Preliminary revealed the adsorbed gas’s desorption and diffusionbehaviour in the condition of elevated temperatures stage, constant temperature stage, the uniaxialrupture stage and the confined pressure stage; An equivalent geometric model of coal porous mediawas established from the coal sample’s pore structure and porosity. Then LS-Dyna was used tosimulate the diffusion behaviors of coal porous medium; A nonlinear cusp catastrophe model of thedestruction of coal uniaxial failure process were introduced, then nonlinear differential equationsunder periodic external force of a coal pillar was established, and the dynamical evolution of thechaotic behavior of coal pillar system was studied.