Combined Effect of Joint Contact Area and Temperature on Stress Wave Propagation in Granite Rock Mass
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 12
Abstract
To explore the effect of the joint contact area and temperature on the dynamic property of rock joints and wave propagation in granite rockmass, an impact test of a jointed granite specimen was conducted with a split–Hopkinson pressure bar. The jointed specimen was composed of an artificially grooved specimen and an intact specimen. The ratio of the joint contact area to the cross-sectional area of the intact specimen was defined as the joint matching coefficient (JMC). The specimens were heat-treated at temperatures of 25°C, 200°C, 400°C, and 600°C. The experimental results showed that with the decrease in the JMC, the nonlinear characteristic of the stress–strain curve for the initial loading segment was more evident for the heat-treated specimen at a constant temperature. Furthermore, the transmitted coefficient, secant modulus, and joint-specific stiffness gradually decreased. For a given JMC, the expansion of the mineral component in the specimen heat-treated at 200°C caused the internal cracks to close, resulting in a larger transmitted coefficient and joint-specific stiffness. For the specimens heat-treated at 400°C and 600°C, the transmitted coefficient and joint-specific stiffness gradually decreased owing to thermal damage. In addition, the deformation of the jointed specimen at different temperatures was mainly caused by joint closure. A smaller JMC or more serious thermal damage led to an increase in the peak value of the joint closure.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This study was financially supported by the National Natural Science Foundation of China (U1965101, 51579062, and 41807266), which is gratefully appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Sep 19, 2019
Accepted: May 12, 2020
Published online: Sep 21, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 21, 2021
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