In order to study the change law of gas desorption index K1of drilling cuttings with moisture after taking hydraulic fracturing measures,the critical value of index K1under different moisture was obtained.Experiment and test using simulation tests was done to gas desorption law and relation of K1-p under the condition of different moistures for No 3 seam in Xinjing Mine in laboratory.The result shows that water has a restrain effect on gas de-sorption of coal,gas desorption index K1of drilling cuttings increases with the increase of gas pressure in a power function relationship,as the moistures of the coal sample increases, the negative exponential function decreases. According to the condition of this research, through the experimental simulation,the relationship between index K1and the moisture un-der critical pressure can be used to correct the critical value of index K1of drill cuttings after the adoption of hydraulic measures.%研究采取水力压裂措施后含水煤体钻屑瓦斯解吸指标K1值随水分的变化规律,得出不同水分下K1值的临界值.在实验室采用模拟测试的方法对新景矿3号煤层不同水分煤样的瓦斯解吸规律和K1-p关系进行实验测试.试验结果表明,水能够抑制煤样瓦斯的解吸,钻屑瓦斯解吸指标K1值随瓦斯压力增大呈幂函数关系增大,随煤样水分增大呈负指数函数关系减小.研究表明,采用实验模拟得出临界压力下K1值与水分的关系函数,可对采取水力化措施后煤层钻屑瓦斯解吸指标K1值的临界值进行修正.
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