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Crystals 2017, 7(10), 306; doi:10.3390/cryst7100306

Time-Varying Characteristics of Granite Microstructures after Cyclic Dynamic Disturbance Using Nuclear Magnetic Resonance

School of Resources and Safety Engineering, Central South University, Changsha 410083, China
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Academic Editor: Helmut Cölfen
Received: 2 August 2017 / Revised: 6 October 2017 / Accepted: 10 October 2017 / Published: 12 October 2017
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Abstract

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 T2 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. View Full-Text
Keywords: nuclear magnetic resonance (NMR); time-varying characteristics of rock microstructure; cyclic dynamic disturbance; P-wave velocity; porosity; aspect of pores nuclear magnetic resonance (NMR); time-varying characteristics of rock microstructure; cyclic dynamic disturbance; P-wave velocity; porosity; aspect of pores
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Liu, C.; Deng, H.; Wang, Y.; Lin, Y.; Zhao, H. Time-Varying Characteristics of Granite Microstructures after Cyclic Dynamic Disturbance Using Nuclear Magnetic Resonance. Crystals 2017, 7, 306.

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