Creep Behavior of Rocks with Rough Surfaces
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 9
Abstract
The time-dependent deformation and long-term strength of rock mass are generally controlled by the mechanical properties of discontinuity, in particular, creep properties. By using the samples based on various JRC values, a series of shear tests and shear creep tests were carried out. The mechanical properties of discontinuity under shear stress were investigated. The creep properties under shearing condition were analyzed. Results showed that both the sliding and cutting behavior can be observed during the shear tests. The sliding effect and cutting effect can obviously change the shear strength parameters. The transient and steady creep appeared in shear creep tests, but accelerating creep was not observed. The long-term strength can be identified by using the variation of creep rate and the transition of different creep stages. The long-term strength is approximately 60–70% of the conventional shear strength.
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Acknowledgments
This work is financially supported by the National Basic Research Program of China-973 Program (Grant No. 2014CB046905), National 863 Program (Grant No. 2012AA112502), and National Natural Science Foundation of China (Grant No. 51378388).
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 9 • September 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 28, 2015
Accepted: Nov 30, 2015
Published online: Mar 18, 2016
Discussion open until: Aug 18, 2016
Published in print: Sep 1, 2016
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