A NUMERICAL APPROACH FOR COUPLED GAS LEAK FLOW AND COAL/ROCK DEFORMATION IN PARALLEL COAL SEAMS

摘要

It is a well-established fact that the description of the interaction between coal/rock and gas in the parallel coal seams is difficult. Nonetheless, the problem of gas leak flow in multi-coal-seam must be studied for the sakes of coal mining safety and coal gas draining. From the viewpoint of interaction mechanics for solid and gas, a coupled mathematical model is presented for solid coal/rock deformation and gas leak flow in parallel deformable coal seams. Numerical solutions using the SIP (Strong Implicit Procedure) method to the coupled mathematical model for double parallel coal seams are also developed in detail. Numerical simulations for the prediction of the safety range using protection layer mining are performed with experimental data from a mine with potential danger of coal/gas outbursts. Analyses show that the numerical simulation results are consistent with the measured data on the spot. The coupled model shows a positive future for applications in a wide range of gas-leak-flow-related problems in mining engineering, gas drainage engineering and mining safety engineering.