基于压汞法的软、硬煤孔隙结构差异性研究

发布时间：2019-05-25 03:50

【摘要】：为了研究软、硬煤孔隙结构的差异性对煤与瓦斯突出的影响,采用压汞法对桂箐煤矿软、硬无烟煤进行试验研究,分析对比了软、硬煤孔隙结构特征,结果表明:软、硬煤进、退汞曲线均未重合,孔隙分布较广泛,软煤微孔孔体积最为发育,微孔孔面积占98%以上,有利于瓦斯的储存,但是构成渗透容积的大、中孔及裂隙发育较少,并且存在"细颈瓶"型孔,导致软煤渗透性较差,不利于瓦斯的扩散及渗流;硬煤微孔孔体积和孔面积均发育很少,而可见孔及裂隙比较发育,因此,硬煤渗透性较软煤强,有利于瓦斯的流动及抽采;总的来说,软煤较硬煤更易发生突出。
[Abstract]:In order to study the influence of the difference of pore structure between soft and hard coal on coal and gas outburst, the experimental study of soft and hard anthracite in Guiqing Coal Mine was carried out by mercury injection method, and the pore structure characteristics of soft and hard coal were analyzed and compared. the results show that: soft and hard coal advance, The mercury withdrawal curve does not coincide, and the pores are widely distributed. The micropore volume of soft coal is the most developed, and the micropore area accounts for more than 98%, which is beneficial to gas storage, but the permeability volume is large and the mesoporous and fracture development is less. And there is a "fine neck bottle" hole, which leads to the poor permeability of soft coal, which is not conducive to the diffusion and seepage of gas. The micropore volume and pore area of hard coal are less developed, but the visible pores and cracks are more developed, so the permeability of hard coal is stronger than that of soft coal, which is beneficial to gas flow and extraction. Generally speaking, soft coal is more prone to outburst than hard coal.
【作者单位】：河南理工大学安全科学与工程学院;河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地;
【基金】：河南省高校基本科研业务费专项资金资助项目(NSFRF140105) 2015年度河南省教育厅高等学校重点科研资助项目(15A440007) 河南理工大学2014年度博士基金资助项目(B2014-004) 2014年地方高校国家级大学生创新创业训练计划资助项目(201410460036)
【分类号】：TD713

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