煤田地质与勘探2018，Vol.46Issue(1)：66-72,7.DOI:10.3969/j.issn.1001-1986.2018.01.012
单轴加载煤孔裂隙各向异性核磁共振特征
Anisotropic characteristics of nuclear magnetic resonance of pores and fractures in coal under uniaxial loading
摘要
Abstract
In order to study the anisotropy of coal pores and fractures,further reveal the mierostructure and physi cal characteristics of coals,coal samples were collected from Pingdingshan eighth mining area for nuclear magnetic resonance(NMR)experiments,transverse relaxation time(T2)and magnetic mesonance imaging(MRI) under uniaxial loading were compared and analyzed.The results showed that T2 was remarkably anisotropic:parallel to bedding and in direction X of vertical main fractures,T2 had three peaks,parallel to bedding and direction Y of main fractures,T2 had two peaks,vertical to direction Z of bedding T2 had one peak.After uniaxial loading,the spectral area of T2 and the porosity decreased,the percentage of peak area induced by porosity variation in direction X and Y declined,but the fracture areas ascended,the fracture area in direction Z declined.The MRI revealed that under uniaxial loading,most pores and fractures parallel to bedding were closed,some fractures had radial deformation,most fractures of loading direction were closed,the compaction effects was remarkable.In summary,under uniaxial loading,the anisotropic characteristics of coal samples were remarkable,and the NMR was an effective method to study microscopic changes of coal pores and fractures.关键词
孔裂隙/核磁共振/各向异性/单轴加载/核磁成像Key words
pores and fractures/NMR/anisotropic characteristics/uniaxial loading/MRI分类
天文与地球科学引用本文复制引用
卢方超,张玉贵,江林华..单轴加载煤孔裂隙各向异性核磁共振特征[J].煤田地质与勘探,2018,46(1):66-72,7.基金项目
国家科技重大专项课题(2016ZX05067-006) （2016ZX05067-006）
河南省高校科技创新团队支持计划(14IRTSTHN002)National Science and Technology Major Project(2016ZX05067-006) （14IRTSTHN002）
Supported by Program for Innovative Research Team(in Science and Technology) in University of Henan Province(14IRTSTHN002) （in Science and Technology）
