煤矿安全2026，Vol.57Issue(2)：81-90,10.DOI:10.13347/j.cnki.mkaq.20250907
三轴应力作用下煤体渗透率演化特征试验研究
Experimental study on evolution characteristics of coal permeability under triaxial stress conditions
摘要
Abstract
Mining stress disturbance causes dynamic evolution of the pore and fracture structures of disturbed coal under complex loading conditions,leading to nonlinear changes in permeability,which significantly affects gas drainage efficiency.To address this issue,relying on triaxial test equipment,taking coal samples from the 150804 working face of Liuzhuang Coal Mine as the research object,and using an automatic coal core permeability measuring instrument,this study investigates the evolution characteristics and failure behaviors of coal permeability under different axial pressure,confining pressure,and gas pressure conditions,and analyzes the variation laws of permeability.The results show that within the range of axial pressure of 3 to 9 MPa,confining pressure of 1 to 3 MPa,and gas pressure of 0.2 to 1.0 MPa,the axial pressure and confining pressure are generally negatively correlated with the per-meability of the coal body.High gas pressure will cause the coal body fractures to close,resulting in a decrease in permeability.However,under high stress combinations,the variation range of permeability tends to decrease.The confining pressure compresses the pore structure of the coal body,and the permeability continuously decreases with the increase of confining pressure.When the axial pressure is 3 MPa and the confining pressure increases from 1 MPa to 3 MPa,the permeability decreases by 0.52×10-17 m2.The influence of axial pressure on permeability shows a trend of first increasing and then decreasing.In the initial stage(axial pressure of 3 to 5 MPa),due to coal body compaction,the permeability decreases.After exceeding the yield limit(axial pressure of 5 to 9 MPa),the internal fractures and cavities increase,and the permeability increases.关键词
煤体渗透率/孔裂隙结构/瓦斯抽采/气体压力/瓦斯渗流/应力抗动Key words
coal permeability/pores-fracture structure/gas drainage/gas pressure/gas seepage/stress disturbance分类
矿业与冶金引用本文复制引用
高涵,成小雨,周爱桃,朱雨轩,双海清..三轴应力作用下煤体渗透率演化特征试验研究[J].煤矿安全,2026,57(2):81-90,10.基金项目
中国中煤重大科技专项资助项目(20221BY001) （20221BY001）
国家重点研发计划资助项目(2023YFF0615404) （2023YFF0615404）
国家科技重大专项资助项目(2024ZD1000408) （2024ZD1000408）
