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为进一步认清压力水影响煤层瓦斯解吸的作用机理,采用实验室试验和理论分析相结合的方法,研究压力水对山西阳泉新景煤矿3号煤层瓦斯解吸特性的影响。在实验室,按照压力水与瓦斯进入煤体的先后顺序,设计出煤样吸附瓦斯前注水和吸附瓦斯后注水2种试验。吸附前注水试验结果表明,注水煤样的瓦斯解吸等温线与吸附等温线之间分叉明显,吸附量最大相差约4 m3/t;而吸附后注水试验结果表明,注水煤样的解吸等温线明显处于干燥煤样解吸等温线上方,吸附量相差最大约5 m3/t,该结果直观表明压力水对瓦斯解吸有抑制效应。经理论分析提出抑制解吸效应的机理,认为煤体孔隙发育是先天条件,压力水的浸入是后天条件,而毛管力和贾敏效应是抑制解吸效应的根本原因。
In order to further understand the action mechanism of pressure water on methane desorption in coal seam, the influence of pressure water on gas desorption characteristics of No.3 coal seam in Xinjing Coal Mine, Yangquan, Shanxi, is studied by a combination of laboratory tests and theoretical analysis. In the laboratory, according to the order of pressure water and gas into coal, two kinds of tests were designed, such as coal-like gas adsorption before gas injection and gas adsorption after gas injection. The results of pre-adsorption water injection test showed that the gas-desorption isotherms and adsorption isotherms of water-filled coal samples had obvious bifurcations, with the maximum difference of about 4 m3 / t. The results of water injection after adsorption showed that the desorption isotherms Obviously above the desorption isotherm of dry coal sample, the difference of adsorption amount is about 5 m3 / t. The result shows that pressure water has an inhibitory effect on gas desorption. Based on the theoretical analysis, the mechanism of inhibition of desorption is proposed. It is considered that pore development of coal is an innate condition, and pressure water immersion is acquired condition, while capillary force and Jia Min effect are the fundamental reasons for inhibiting desorption effect.