Experiment of the desorption law of loaded gas-filled raw coal

In order to study the desorption law of loaded gas-filled raw coal, relying on own developed gasfilled coal heat-flow-solid-mechanical coupled adsorption-desorption experiment system, experiment determ­ined the gas desorption quantity of different loading stage under different confining pressure and pore pressure, the experimental data were fitted, the influence of axial compression, confining pressure and pore pressure on gas desorption of raw coal was analyzed. The results showed that the gas desorption quantity decreases and then increases with the increase of axial compression, showing a "V" shaped variation, the minimum appeared in the stage of yield strength, maximum in brittle failure stage; the gas desorption decreases with the increase of confining pressure, with the increase of adsorption equilibrium pressure, gas desorption quantity increase as a quadratic function.