INVESTIGATION ON LAW OF METHANE GAS FLOW IN COAL WITH COAL-GAS OUTBURST HAZARD AND LOW PERMEABILITY

摘要: For knowing the law of methane gas flow in coal with coal-gas outburst hazard and low permeability (CCOHLP),an experimental study samples,produced by raw CCOHLP from a mine at Nantong coalfield,is performed self-developed triaxial load system way steady-state under different confining pressures. It presents comparison test data on processed traditional method computing fitting Klinkenberg effect. is proved experiments numerical simulation that:(1) effect especially prominent;(2) for coal,the coefficient b absolute related to power function;meanwhile,the bulk stress quadratic polynomial function;(3) increases gradually decreasing permeability;meanwhile,the decreases increasing stress;(4) processing results are reason considering effect;and (5) algebraic expression effective obtained this experiment reflects combined impact pressure it able simulate CCOHLP.