Roughness Evaluation for Distinguishing Fresh and Sheared Rock Joint Surfaces with Different Sampling Intervals
Publication: International Journal of Geomechanics
Volume 21, Issue 12
Abstract
The subtle alteration of surface geometry from a fresh surface to a sheared surface usually results in a considerable variation in the shear strength of jointed rock mass. Through profiling surfaces of the granite joints before and after the shear tests, an evaluation scheme was newly proposed by determining a desirable characteristic index and sampling interval of surface measurement in order to distinguish fresh and sheared joint surfaces quantitatively. The measured data demonstrated that although the mean Z2 (root-mean square first derivation) values of all the profile lines were confirmed reasonable for estimating the joint roughness coefficient (JRC) value of the fresh joint surface, it could not completely evaluate the roughness of the sheared joint surfaces. Meanwhile, the distribution of slope angles, as the characteristic parameter, was proved to enable to clearly distinguish the fresh and sheared rock joint surfaces incorporating the small sampling scales (≤0.1 mm). The numerical simulations implemented in a mechanical shear model could confirm the critical effect of a slight change in surface geometry and further prove that the sampling interval of 0.1 mm could sufficiently capture the evolved waviness and unevenness of rock joint surfaces. Overall, it was confirmed that the results of our study provide new clues for evaluating the surface roughness of fresh and sheared rock joints and can be beneficial for understanding the variation of surface geometry during the shear process.
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Acknowledgments
The first author was financially supported by the Japanese Government (MEXT) Scholarship and the Chinese Scholarship Council.
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Published In
International Journal of Geomechanics
Volume 21 • Issue 12 • December 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 5, 2020
Accepted: Aug 17, 2021
Published online: Sep 29, 2021
Published in print: Dec 1, 2021
Discussion open until: Mar 1, 2022
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