工程科学学报2018，Vol.40Issue(2)：144-151,8.DOI:10.13374/j.issn2095-9389.2018.02.003
基于核磁共振的不同含水状态砂岩动态损伤规律
Dynamic damage laws of sandstone under different water bearing conditions based on nuclear magnetic resonance
摘要
Abstract
To study the dynamic damage characteristics of sandstone under different water bearing conditions, three different kinds of samples with different moisture states ( dry, semi-saturated, and saturated) were prepared. The impact damage of the rock was test-ed using a split Hopkinson pressure bar ( SHPB) with four values of low incident energy. The T2 spectrum curves, porosity, and pore image of the samples were obtained by scanning the samples by nuclear magnetic resonance test. The results show the following:(1) an increase in the impact energy led to increased average strain rate and strength;(2) after impact, the porosity and porosity variation rate of every sample under different water bearing conditions increase with different amounts; ( 3 ) compared with the test before im-pact, T2 spectrum curve has obvious right movement trend and large pore peaks increase. The greater the impact energy increase, more obvious the large pore peaks increased are;(4) nuclear magnetic resonance images show that the number and size of pores increase, which show the expansion and evolution of pores in the rocks.关键词
含水状态/动态损伤/冲击试验/核磁共振/孔隙度/T2谱曲线Key words
water bearing condition/dynamic damage/impact test/nuclear magnetic resonance/porosity/T2 spectrum curves分类
建筑与水利引用本文复制引用
褚夫蛟,刘敦文,陶明,彭怀德..基于核磁共振的不同含水状态砂岩动态损伤规律[J].工程科学学报,2018,40(2):144-151,8.基金项目
国家自然科学基金资助项目(51404303) （51404303）
山东省自然科学基金资助项目(ZR2016EL06) （ZR2016EL06）
