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Rock Mechanics and Rock Engineering
Published in: Rock Mechanics and Rock Engineering 12/2020

26-08-2020 | Original Paper

An Experimental and Numerical Study on the Influence of Filling Materials on Double-Crack Propagation

Authors: Xiaoying Zhuang, Shuwei Zhou

Published in: Rock Mechanics and Rock Engineering | Issue 12/2020

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Abstract

Filling materials such as clay or sand widely exist in natural rock joints and work as weak bonds between the joint surfaces. The fillings affect rock deformation and failure behavior, and show different influences in terms of single crack or multiple cracks. While most of the literature have focused on unfilled cracks in brittle materials, this study aims to investigate various filling materials on the crack behavior, e.g., initiation, secondary cracks and peak strength. In this paper, the crack propagation in rock-like specimens with double-filled and unfilled cracks are investigated experimentally and numerically. Uniaxial compression tests were conducted and the experimental observations indicate that the peak stress and first crack initiation stress of the specimens vary with different geometries and different filling materials, while the crack initiation location and the pattern of crack coalescence show similar behavior between filled and unfilled cracks. In parallel to the experimental tests, numerical simulations were carried out using a modified phase field model (PFM) to complement the experiments and provide a new perspective. The PFM is found to produce consistent stress–strain curve, strength, and crack patterns with those observed in the experimental tests for both unfilled and filled cracks.
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Appendix
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Metadata
Title
An Experimental and Numerical Study on the Influence of Filling Materials on Double-Crack Propagation
Authors
Xiaoying Zhuang
Shuwei Zhou
Publication date
26-08-2020
Publisher
Springer Vienna
Published in
Rock Mechanics and Rock Engineering / Issue 12/2020
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI
https://doi.org/10.1007/s00603-020-02220-1

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