Effect of Grout on Mechanical Properties and Cracking Behavior of Rock-Like Specimens Containing a Single Flaw under Uniaxial Compression
Publication: International Journal of Geomechanics
Volume 18, Issue 10
Abstract
To investigate the influence of the geometry of a fracture and grouting on failure behaviors and mechanical properties of rock masses, uniaxial compressive tests were conducted on rock-like specimens containing single unfilled and grout-infilled flaws having different geometries. The compressive strength, deformation behaviors, and failure modes were studied and compared among the said specimens. Grouting improves the strength of grouted specimens through the following two mechanisms: (1) by increasing the shear-strength parameter values of the interface between the grout and model material and (2) by reducing the stress concentration at the flaw tips. Seven and eight crack types identified based on the crack geometry and crack-propagation mechanisms were used to analyze the failure modes of the specimens with the unfilled flaws and the grout-infilled flaws, respectively. An equivalent strength theory is introduced to predict the strength and the range of the flaw inclination angle of the grouted specimens for which the damage occurs along the interface between the grout and model material.
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Acknowledgments
This research was financially supported by the Natural Science Foundation of China (Grants 41672258 and 41102162) and the Postgraduate Research and Practice Innovation Program of Jiangsu Province. The first author of the paper is grateful to the Chinese Scholarship Council for providing a scholarship to conduct a part of the research described in this paper as a Visiting Research Student at the University of Arizona.
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Published In
International Journal of Geomechanics
Volume 18 • Issue 10 • October 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Nov 6, 2017
Accepted: Mar 1, 2018
Published online: Jul 25, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 25, 2018
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