Abstract: In order to study the inhibition of injection water to the gas desorption, the desorption process of the coal injected water was determined using the home-made instrument. The result shows that the injected water has a restrain effect on the gas desorption. When the moisture increases from 0.05% to 8.39%, the maximum gas desorption amount decreases from 12.525 mL/g to 4.284 mL/g, reduces by 65.80%, and the initial gas desorption velocity decreases from 2.07 mL/(g.min) to 0.33 mL /(g.min), reduces by 84.06%. The maximum inhibition rate of the injection water to the gas desorption is 42.48%. The gas desorption index reduces in a logarithm relationship as the water increased. By increasing the moisture of coal seam, the gas desorption index of coal can be effectively reduced. According to the condition of this research, the gas desorption index of drilling cuttings would be less than 0.5 mL /(g.min1/2), the critical value of coal and gas outburst risk, when the moisture of coal sample is greater than 5.19%. The study shows that it is feasible to eliminate coal seam gas outburst danger by water injection.

Key words: injection water, desorption inhibition rate, maximum desorption quantity, gas desorption velocity, gas desorption index of drilling cuttings