Microcracking Mechanism Analysis of Rock Failure in Diametral Compression Tests
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 6
Abstract
A moment tensor analysis of acoustic emission was applied to quantitatively study the microcracking mechanism and damage evolution process in cylindrical specimens of granite and sandstone under diametral compression. It was found that the localized damage zone tended to originate and propagate from the vicinity of the loading ends. During the damage accumulation process, the tensile cracks played a dominant role in number, but the acoustic emission (AE) energy release of microcracks of different types presented an inconsistent trend for the two types of rock. Scanning electron microscope (SEM) observations on the fractured surfaces were conducted, which indicated that during the rock failure process there coexisted microcracks of three types—tensile, shear, and mixed-mode—due to the heterogeneity of the mechanical properties of the rock. The microscopic observations using a polarized light microscope technique revealed that the mineralogical composition and microstructure of rock had a significant effect on its microcracking mechanism.
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Acknowledgments
The financial support from the National Basic Research Program of China (973 programs) (Grant Nos. 2015CB058102 and 2014CB046904) and the National Nature Science Foundation of China (Grant No. 41602324) are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 14, 2017
Accepted: Oct 24, 2017
Published online: Mar 20, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 20, 2018
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