水分对煤体瓦斯吸附及径向渗流影响试验研究

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Abstract For knowing the radial gas seepage characteristics in coal around hydraulic borehole，isothermal desorption experiment and radial gas seepage experiment of drying coal sample，liquid water wetting coal sample and high pressure water injection coal sample after methane adsorption，produced by the outburst coal from Qingdong mine，were carried out by a self-developed test system of radial gas seepage. The results show that：(1) At the same balanced gas pressure，the adsorption capacity of high pressure water injection coal sample is higher than that of drying coal sample，which are significantly higher than that of liquid water wetting coal sample. (2) Adsorption capacity of liquid water wetting coal sample decreases with the increase of moisture content；and the relationship between adsorption capacity and moisture content can be described as logarithmic function；the fitting function of the relationship between the coefficients and adsorption gas pressure is obtained. (3) At the same overburden pressure，the permeability of high pressure water injection coal sample is significantly higher than that of drying coal sample；the permeability of liquid water wetting coal sample is slightly lower than that of drying coal sample；the permeability of liquid water wetting coal sample decrease with the increase of moisture content；and the trend is particularly significant in low gas pressure stage. Based on the results of test，effect mechanism of water on the radial gas flow characteristics is analyzed；it is pointed out that the coal gas around the hydraulic drilling flows through the original desorption and seepage area，pressure water inhibitory desorption and seepage area and liquid water natural wetting coal desorption and seepage area.

Key words： mining engineering moisture content isothermal desorption permeability radial gas seepage

Received: 20 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I3/586

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