工程科学学报2017，Vol.39Issue(11)：1634-1639,6.DOI:10.13374/j.issn2095--9389.2017.11.004
循环动力扰动下花岗岩细观损伤特性试验研究
Experimental study on microscopic damage characteristics of granite under cyclic dynamic disturbances
摘要
Abstract
To investigate the microscopic damage characteristics of rock materials under cyclic dynamic disturbance, granite was chosen as the research object,and the split Hopkinson pressure bar(SHPB) was used to outperform the cyclic impact test. Besides, with the nuclear magnetic resonance(NMR) technique,the porosity,crosswise relaxation time T2distribution and magnetic resonance image (MRI) of the rock sample were obtained. The results show that within the range of the rock's elastic limit,the porosity reduces after the dynamic disturbance. The initial and final transverse relaxation time T2shortens, which indicates the process of cyclic disturbance causes the formation of small pores,where the size and number of large pores decrease. The decrease of porosity does not mean that the number of all kinds of pores decreases;on the contrary,the number of small pores increases,and the decreased number of large pores is the root cause which leads to the decrease of porosity after dynamic disturbance.关键词
循环动力扰动/细观损伤/核磁共振/孔隙度/T2谱分布/核磁共振图像Key words
cyclic dynamic disturbance/meso-damage/nuclear magnetic resonance/porosity/T2spectrum distribution/magnet-ic resonance image分类
矿业与冶金引用本文复制引用
邓红卫,刘传举,柯波,王远,张亚南..循环动力扰动下花岗岩细观损伤特性试验研究[J].工程科学学报,2017,39(11):1634-1639,6.基金项目
国家自然科学基金资助项目(51474252) （51474252）
国家自然科学基金青年基金资助项目(41502327) （41502327）
中南大学中央高校基本科研业务费专项资金资助项目(2017zzts190) （2017zzts190）
