| 二氧化碳致裂对煤岩孔隙表面分形特征影响实验研究 |
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| 引用本文： | 彭鑫,江泽标,李波波,邓川,' target="_blank" rel="external">,许石青,孙悦.二氧化碳致裂对煤岩孔隙表面分形特征影响实验研究[J].中国安全生产科学技术,2019,15(2):111-117. |
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| 作者姓名： | 彭鑫 江泽标 李波波 邓川 " target="_blank">' target="_blank" rel="external"> 许石青 孙悦 |
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| 作者单位： | （1.贵州大学 矿业学院，贵州 贵阳 550025；2. 中煤科工集团 重庆研究院有限公司，重庆 400039；3. 贵州安和矿业科技工程股份有限公司，贵州 贵阳 550081） |
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| 基金项目： | 基金项目: 贵州省科技厅项目(黔科合支撑［2017］2815)；国家自然科学基金项目（51804085） |
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| 摘 要： | 为了探究二氧化碳致裂对贵州高瓦斯低渗透煤层的孔隙致裂增透作用，提出了应用低温氮吸附与FHH模型相结合的方法，分析致裂前后煤样的微观孔隙特征变化，并将分形维数与孔隙特征参数结合。研究结果表明:二氧化碳致裂对煤的孔隙具有明显的作用效果，致裂后煤岩体中微孔含量、比表面积减少，而孔容、平均孔直径增加；致裂作用会使煤的分形维数减小，孔隙表面受致裂效果会趋于光滑；受二氧化碳致裂作用，分形维数的大小与平均孔直径、孔容和吸附量等存在负相关关系，与比表面积、微孔含量等呈正相关关系。
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| 关 键 词： | 煤与瓦斯突出 二氧化碳致裂 低温氮吸附 孔隙特征变化 分形表面 |
Experimental study on influence of CO2 cracking on surface fractal characteristics of coal pore |
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| PENG Xin,JIANG Zebiao,LI Bobo,DENG Chuan,' target="_blank" rel="external">,XU Shiqing,SUN Yue.Experimental study on influence of CO2 cracking on surface fractal characteristics of coal pore[J].Journal of Safety Science and Technology,2019,15(2):111-117. |
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| Authors: | PENG Xin JIANG Zebiao LI Bobo DENG Chuan " target="_blank">' target="_blank" rel="external"> XU Shiqing SUN Yue |
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| Affiliation: | (1. College of Mining, Guizhou University, Guiyang Guizhou 550025, China;2. Chongqing Research Institute, China Coal Technology and Engineering Group, Chongqing 400039, China;3. Guizhou Anhe Mining Technology and Engineering Co., Ltd., Guiyang Guizhou 550081, China) |
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| Abstract: | In order to explore the effect of carbon dioxide cracking on the pore cracking and permeability improvement of high gas and low permeability coal seams in Guizhou, a combined method of low temperature nitrogen adsorption and fractal FHH model was proposed. The change of microscopic pore characteristics of coal samples before and after cracking was analyzed, and the fractal dimension were combined with the pore characteristic parameters. The results showed that the carbon dioxide cracking had obvious effect on the pores of coal. After the cracking, the micropore content and specific surface area of the coal and rock mass decreased, while the pore volume and average pore diameter increased. The cracking effect will reduce the fractal dimension of coal, and the pore surface would tend to be smooth due to the cracking effect. Affected by the carbon dioxide cracking, the magnitude of fractal dimension had a negative correlation with the average pore diameter, pore volume and adsorption quantity, while a positive correlation with the specific surface area and micropore content. |
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| Keywords: | coal and gas outburst carbon dioxide cracking low temperature nitrogen adsorption pore characteristic change fractal surface |
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