Dynamic Mechanical Behavior of Granite under the Effects of Strain Rate and Temperature
Publication: International Journal of Geomechanics
Volume 20, Issue 2
Abstract
The dynamic properties of rock under different strain rates and temperatures play an important role in the stability of rock mass. To investigate the dynamic behavior of granite specimens subjected to high strain rates and relatively low temperatures, dynamic compression tests were carried out using the split Hopkinson pressure bar (SHPB) experimental system. The strain rate effect on dynamic characteristics of granite at temperatures from 25°C to 150°C were studied and the relationships between dynamic failure modes and the energy absorption of granite specimens at different strain rates were revealed through rock fragment analysis. Meanwhile, the damage evolution was quantified by elastic moduli and porosity. The results indicate that the dynamic peak stress, peak strain, and specific energy absorption (SEA) have positive correlations with strain rates. The dynamic compression strength shows an increase when the temperature rises from 50°C to 110°C, then decreases with higher temperatures, while the elastic modulus is more sensitive to temperature than strain rate. The thermal damage decreases at low temperature and appears to be negative below 110°C. A power function relation between SEA and fragment size is found to exist at different strain rates. It denotes that 110°C is a critical temperature that induces changes in physico-mechanical properties and the relatively low temperature has an enhancement effect on the dynamic strength of granite samples.
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Acknowledgments
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51474158) and the National Key Basic Research Program of China (Grant No. 2014CB239203). The authors also express thanks to Professor Qiuhong Wu, Dr. Fei Wang, and Dr. Lei Wen for the SHPB and NMR tests technical support. The editors and the reviewers are acknowledged for their valuable comments.
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Published In
International Journal of Geomechanics
Volume 20 • Issue 2 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Aug 27, 2018
Accepted: Jul 17, 2019
Published online: Dec 13, 2019
Published in print: Feb 1, 2020
Discussion open until: May 13, 2020
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