煤矿安全2024，Vol.55Issue(11)：84-91,8.DOI:10.13347/j.cnki.mkaq.20222157
基于压汞和低温氮吸附试验的致裂煤孔隙结构及分形特征研究
Study on pore structure and fractal characteristics of fractured coal based on mercury injection and low temperature nitrogen adsorption tests
摘要
Abstract
In order to study the effect of cracking on the pore microstructure of coal rock,low-temperature nitrogen adsorption meth-od and mercury injection method were used to study the pore morphology and pore size distribution of coal samples before and after cracking,and then the fractal dimension of pores in different ranges was calculated based on the data of low-temperature nitrogen and mercury injection combined with the fractal theory.The results show that the pore volume of coal samples increases after crack-ing.The large pore volume of cracked coal is 1.4-2.2 times that of raw coal,and the micropore volume is 3.7-8.2 times that of raw coal.The fractal dimension of raw coal’s seepage pore and adsorption pore is greater than that of cracking coal at pressure less than 13.8 MPa and low pressure zone,and the fractal dimension of raw coal’s diffusion pore is smaller than that of cracking coal at pres-sure more than 13.8 MPa but less than 137.9 MPa and high pressure zone.关键词
CO2 致裂/压汞/低温氮吸附/孔隙特征/分形特征Key words
CO2 fracturing/mercury compression/low temperature nitrogen adsorption/pore characteristics/fractal characteristics分类
矿业与冶金引用本文复制引用
陈思粮,江泽标,权西平,杨希法,莫桥顺..基于压汞和低温氮吸附试验的致裂煤孔隙结构及分形特征研究[J].煤矿安全,2024,55(11):84-91,8.基金项目
贵州省科技厅资助项目(黔科合支撑[2020]4Y050) （黔科合支撑[2020]4Y050）
