割缝预抽后煤瓦斯吸附特性的变化特征

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摘要为了研究割缝预抽后煤瓦斯吸附特性的变化特征，以杨柳煤矿10煤层7个煤样为研究对象，采用甲烷等温吸附实验测定煤样的Langmuir方程吸附常数a和b，通过压汞实验和低温液氮吸附实验的有机结合，表征煤样孔径分布和比表面积的变化。结果表明：(1) 随着煤样与割缝孔距离的增大，吸附常数a呈逐渐增大的趋势，而吸附常数b的变化趋势则相反，但与甲烷等温吸附曲线的曲率变化趋势一致。(2) 随着煤样与割缝孔距离的增大，煤样孔径分布发生显著的变化，吸附孔孔容比从33.27%增大到55.38%，比表面积从7.254 m2/g增大到9.856 m2/g。(3) 割缝预抽后，煤样参数曲线(Langmuir方程吸附常数、吸附孔孔容比和比表面积)的变化幅度均呈现出平缓→急剧→平缓的趋势，具有有界性和非线性的特征，符合Boltzmann方程。割缝预抽后煤瓦斯吸附特性的变化存在明显的分区特征：变化显著区(小于1.8 m)、变化过渡区(1.8～4.5 m)和变化不显著区(大于4.5 m)。(4) 割缝预抽后煤体瓦斯压力下降，有效应力增大，进而控制煤体的吸附特性。研究结果可以为煤层水力割缝增透实践提供可靠的基础理论支撑。

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关键词 ：采矿工程, 水力割缝, 煤的吸附特性, Boltzmann方程

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

收稿日期: 2014-06-09

引用本文:

邹全乐1，2，林柏泉1，2，刘厅1，2，朱传杰1，2，闫发志1，2，周延1. 割缝预抽后煤瓦斯吸附特性的变化特征[J]. 岩石力学与工程学报, 2014, 33(10): 2117-2124.
ZOU Quanle1，2，LIN Baiquan1，2，LIU Ting1，2，ZHU Chuanjie1，2，YAN Fazhi1，2，ZHOU Yan1. VARIATION OF GAS ADSORPTION OF COAL AFTER HYDRAULIC SLOTTING AND PRE-DRAINING. , 2014, 33(10): 2117-2124.

链接本文:

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

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