期刊
CRYSTALS
卷 7, 期 10, 页码 -出版社
MDPI AG
DOI: 10.3390/cryst7100306
关键词
nuclear magnetic resonance (NMR); time-varying characteristics of rock microstructure; cyclic dynamic disturbance; P-wave velocity; porosity; aspect of pores
资金
- National Science Foundation of China [51474252]
- National Natural Science Foundation of China Youth Fund [41502327]
- Special Funds for Basic Research of Central South University [2017zzts190, 2016zzts095, 2015zzts080]
To investigate the variation in the characteristics of rock microstructure after cyclic dynamic disturbances, a split Hopkinson pressure bar (SHPB) was used to carry out cyclic dynamic impact tests on granite, and the P-wave velocity was used as the characteristic parameter representing the microstructural change. Using the nuclear magnetic resonance (NMR) technique, the porosity and the T-2 distribution of rock samples were obtained. The results show that, after the cyclic dynamic disturbance, the P-wave velocity within the rock specimen decreases but rebounds with time. At the elastic phase, when the axial loading increases, the P-wave velocity declines. The T2 limit is shortened, and the cyclic dynamic disturbance process promotes the formation of small pores and decreases the size and quantity of large pores. After the cyclic dynamic disturbance, the porosity of the rock samples was reduced.
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