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Geotechnical and Geological Engineering
Published in: Geotechnical and Geological Engineering 6/2020

17-07-2020 | Original Paper

Experimental and Numerical Study on Crack-Arrest Behaviours of Rock-Like SCDC Specimens

Author: Yao Song

Published in: Geotechnical and Geological Engineering | Issue 6/2020

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Abstract

Studying rock crack-arrest toughness, which determines the arrest behaviours in rock materials with cracks, is important to prevent further damage to rock mass. To investigate the crack-arrest behaviours both qualitatively and quantitatively, dynamic impact experiments (using caustics and photoelastic methods) were performed on rock-like (epoxy resin) single cleavage drilled compression (SCDC) specimens to study the crack-arrest behaviours and the microscopic fracture characteristics. The crack-arrest toughness of the SCDC specimen was obtained and the extended finite element method (XFEM) in ABAQUS software was used to validate the experimental results. The results show that under the interaction between reflected compression and tensile waves, the running crack experiences two crack-arrest periods before the final arrest, and the crack-arrest toughness stabilizes at a value of 0.669 MPa m1/2. Moreover, the peak propagation velocity in each crack initiation process gradually decreases with the development of the crack path. Additionally, the observations by scanning electron microscopy (SEM) and photoelastic methods show that the roughness of the fracture surface is influenced by the crack-arrest behaviours, causing the spalling fragments as well as wing micro-cracks in the fracture surface.
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Metadata
Title
Experimental and Numerical Study on Crack-Arrest Behaviours of Rock-Like SCDC Specimens
Author
Yao Song
Publication date
17-07-2020
Publisher
Springer International Publishing
Published in
Geotechnical and Geological Engineering / Issue 6/2020
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI
https://doi.org/10.1007/s10706-020-01469-1

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