Microcracking Mechanism Analysis of Rock Failure in Diametral Compression Tests

AbstractA 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 propag...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2018-06, Vol.30 (6)
Main Authors: Liu, Quansheng, Liu, Qi, Pan, Yucong, Liu, Xuewei, Kong, Xiaoxuan, Deng, Penghai
Format: Article
Language:English
Subjects:
Acoustic emission testing
Building materials
Civil engineering
Compression tests
Compression zone
Crack initiation
Damage accumulation
Damage localization
Emission analysis
Failure analysis
Fracture mechanics
Mechanical properties
Microcracks
Polarized light
Sandstone
Technical Papers
Tensor analysis
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Summary:AbstractA 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.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0002251