割缝预抽后煤瓦斯吸附特性的变化特征

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Abstract Experiments were carried out to investigate the variation of gas adsorption of coal after the treatment of hydraulic slotting and pre-draining using seven coal samples obtained from coal seam 10 of Yangliu mine. The experiment of isothermal adsorption of methane was adopted to measure the adsorption constants. The mercury injection capillary pressure(MICP) and the nitrogen gas adsorption(N2GA) were applied to obtain the variation of the pore size distribution and the specific surface area. With the increasing of the distance between the sampling locations and the slotted borehole，the adsorption constant a increases and the adsorption constant b decreases，which are consistent with the variation of the curvature of the curves of isothermal adsorption of methane. With the increase of borehole distance，the pore size distribution of coal sample varies substantially. The volumetric proportion of adsorption pore increases from 33.27% to 55.38% and the specific surface area increases from 7.254 m2/g to 9.856 m2/g. The curves of parameters(adsorption constants，volumetric proportion of adsorption pore and specific surface area) of coal within the slotting disturbance were found to be bounded and nonlinear and the curves varied gently initially，then drastically and finally gently again，obeying the Boltzmann equation. The gas adsorption of coal mass after the treatment of hydraulic slotting and pre-draining related closely to the distance from the slotting hole. The region below 1.8 m is significantly affected；the region between 1.8 and 4.5 m is transitional and the region over 4.5 m away is little influenced. Slotting disturbance leads to the decrease of the gas pressure and the increase of the effective stress，controlling the adsorption property of coal.

Key words： mining engineering hydraulic slotting adsorption property of coal Boltzmann equation

Received: 09 June 2014

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http://www.rockmech.org/EN/Y2014/V33/I10/2117

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