摘要
为探索围压循环加卸载下煤体孔裂隙结构及渗透率的演化规律,采用围压循环加卸载在线核磁共振测试方法,测试得到了褐煤循环加卸载过程T_(2)图谱演化曲线及其渗透率。结果表明,孔裂隙结构和渗透率对应力的响应特征总体相似,但存在细节差异。孔隙度、渗透率均与围压呈负相关关系,且任意一次加载过程的孔隙度和渗透率均大于该次卸载过程的。渗流通道随围压的增大而逐渐闭合,在卸载过程中则无法完全恢复,另一方面围压的彻底卸除引发裂隙的张开,新的渗流通道出现。研究结果可为煤矿动力灾害防治和矿井高效安全生产提供理论支撑。
To explore the evolution law of pore and fracture structure and permeability of coal under cyclic loading and unloading under confining pressure,an online nuclear magnetic resonance testing method was used to obtain the T_(2) spectrum evolution curve and permeability of lignite during cyclic loading and unloading process.The results indicate that the response characteristics of pore fracture structure and permeability to stress are generally similar,but there are differences in details.Both porosity and permeability are negatively correlated with confining pressure,and the porosity and permeability during any loading process are greater than those during the unloading process.The seepage channel gradually closes with the increase of confining pressure,and cannot be fully restored during the unloading process.On the other hand,the complete removal of confining pressure causes the opening of cracks,and new seepage channels appear.The research results can provide theoretical support for the prevention and control of coal mine power disasters and the efficient and safe production of mines.
作者
颜泽文
马衍坤
YAN Zewen;MA Yankun(The Key Laboratory of Safe and Efficient Mining of Coal Mines Jointly Established by the Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China;Safety and Efficient Mining Anhui University Engineering Technology Research Center,Anhui University of Science and Technology,Huainan 232001,China)
出处
《煤》
2025年第4期43-47,74,共6页
Coal
基金
云南省重点研发计划项目(202303AA080014)。
关键词
循环加卸载
孔裂隙结构
渗透率
核磁共振
cyclic loading and unloading
pore crack structure
penetration rate
fractal dimension
作者简介
颜泽文(2000-),男,湖南郴州人,在读研究生,从事动力灾害防治研究工作,E-mail:1296620562@qq.com。
