Damage of Sandstone Induced by Repetitive Impact Loading
Publication: International Journal of Geomechanics
Volume 20, Issue 7
Abstract
The dynamic weakening of rock is frequently observed when the rock is subjected to a series of repetitive impact loads. Sandstone is utilized in our experiment on the dynamic performance under impact loading. The split Hopkinson pressure bar system with a confining pressure device is used for the experiments. Observations on strain waves recorded by a transmission bar indicate that sandstone demonstrates an evident nonlinear response under impacting loads which accompany a dynamic weakening effect. To quantify the damage induced by impact loads, we introduce a damage factor to study the weakening degree induced by impact loading and determine that sandstone breaks when the damage factor exceeds 0.52. Detailed statistics on the broken characteristics of the explored sandstone samples show that the damage evolution mainly extends along the maximum shear stress face, thus resulting in shear failure. Based on nonlinear wave propagation theory, we determine a shock wave distance for the explored sandstone. Result shows that the shock wave distance is larger than the sample length. Moreover, from a uniaxial compression test on specimens after impact tests, we found that failure patterns develop from split failure to shear slip failure with the increase in damage factor. Moreover, experimental observations comprise numerous dynamic regimes which can be extended to other granular rocks.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Nos. 515090925 and 11702095) and the Natural Science Foundation of Jiangxi Province (Grant No. 20181BBG70052).
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Published In
International Journal of Geomechanics
Volume 20 • Issue 7 • July 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Aug 21, 2019
Accepted: Feb 6, 2020
Published online: Apr 22, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 22, 2020
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