Experiment study on desorption law of gassy coal mass under different loading status

in order to study the gas desorption law of the mining sean and accurately predict the gas emission volunme of the nining sean taking the coal sampes from Zhagu No 2 Mine as the stuty obijects under aifferent pore prssure condtons thegas desorption experiment were conducted on the partcle coal.no load raw coal and loaded raw cal of 60 min before the desorption stared .and the gas desorption rate and desorption volume of the coal samples were systematcaly analyzed. The experiment results showed that with the coal mining face pushed forward,the insitapore and crack of the coal mass wihn certain scope of the front cal mass were destroyed and the gas emission ate was increased. n the front three minutes of the raid desopton stage.thegas desoption volume of the particle coal was56.02~7.23 tines igher than no loaded raw cal under the same experiment co dton and was 8.69~ 20.86 times higher tan the loaded a cal.Thti to say that the gas desorption volume of the falling coal would be the main composition par of the gas emission volune in the pocess of the coal mining fae pushing fowar .t"ih the seamgas pressure increased,the infuences to the seam gas desorption law were increased and the diference betwee the gas desorption rate and the desorpion volume ofthe three coal were decreased.The study results could provide references to accurately predict the gas emission volume of the mining seam