矿业科学学报2025，Vol.10Issue(5)：834-847,14.DOI:10.19606/j.cnki.jmst.2025094
脉冲超声波作用下煤体孔隙扩容与增渗效应试验研究
Experimental study on pore expansion and permeability enhancement in coal induced by pulsed ultrasonic wave
摘要
Abstract
This study attempts to investigate the effects of pulsed ultrasonic wave on the pore structure of coal matrix and the patterns of gas seepage.We developed an acoustic-liquid coupling ultrasonic excita-tion experimental platform for coal samples to analyze the pore expansion and permeability enhancement effects in coal under pulsed ultrasonic excitation by using gas permeability measurement of coal cores and nuclear magnetic resonance(NMR)testing.Results show that increasing pulsed ultrasonic fre-quency excitation would lead to an increase in T2 spectrum area,effective porosity and permeability of the coal matrix,while a decrease in residual porosity,T2 cutoff value,and fractal dimension of seepage pores.The variation rates of these parameters exhibited an exponential relationship with the pulsed fre-quency.When the pulsed frequency increased from 1 to 16 times,permeability growth rate increased from 19％to 172％.Pulsed ultrasonic excitation promoted the transformation of closed pores into open pores in coal samples,forming more optimal seepage channels and effectively improving permeability.Under the synergistic effect of mechanical and cavitation effects,pulsed ultrasonic wave efficiently in-duce cumulative fatigue damage in coal,promoting the development and expansion of pores,and en-hancing coal porosity and permeability.Increasing pulsed frequency under the same energy consump-tion could enhance permeability,providing a basis for the optimized application of pulsed ultrasonic technology in permeability enhancement treatment of low-permeability coal seams.关键词
脉冲超声波/孔隙结构/渗流特性/煤层增渗Key words
pulsed ultrasonic wave/pore structure/seepage pattern/permeability enhancement in coal seam分类
矿山工程引用本文复制引用
林海飞,周行,郝荷杰,胡彪,严敏,王瑞哲,仇悦,张笑盈..脉冲超声波作用下煤体孔隙扩容与增渗效应试验研究[J].矿业科学学报,2025,10(5):834-847,14.基金项目
国家自然科学基金青年科学基金(A类)(52425405) （A类）
国家自然科学基金(52174207,52274228) （52174207,52274228）
