Micromechanical study of loading rate effects between a hole and a crack

authored by: Shuai Zhou, Xiaoying Zhuang
Abstract: The interactions between defects are important in rocks. The micromechanical interactions between a circular hole and a pre-existing crack under uniaxial compression with different loading rates are investigated by the discrete element method (DEM). The crack initiation, crack propagation, and crack coalescence at different loading rates are studied. The loading rates influence the primary as well as secondary cracks. Both the primary and secondary cracks disturb the stress field and displacement field. The DEM simulation explains the initiation position of the primary and secondary cracks. The evolution of the displacement field and the stress field at different loading rates is analyzed. A new displacement field type is observed. The hole is easier to be broken by compression at higher loading rates while it tends to be broken by the coalescence crack at lower loading rates. The high loading rates lead to shielding effects of the hole on the pre-existing crack.
Organisation(s): Institute of Continuum Mechanics
External Organisation(s): Tongji University
Type: Article
Journal: Underground Space (China)
Volume: 4
Pages: 22-30
No. of pages: 9
ISSN: 2096-2754
Publication date: 03.2019
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Civil and Structural Engineering, Geotechnical Engineering and Engineering Geology, Building and Construction
Electronic version(s): https://doi.org/10.1016/j.undsp.2018.08.001 (Access: Open)
https://doi.org/10.15488/10976 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{c32cb941325d465596bf26651f2fc485,
title = "Micromechanical study of loading rate effects between a hole and a crack",
abstract = "The interactions between defects are important in rocks. The micromechanical interactions between a circular hole and a pre-existing crack under uniaxial compression with different loading rates are investigated by the discrete element method (DEM). The crack initiation, crack propagation, and crack coalescence at different loading rates are studied. The loading rates influence the primary as well as secondary cracks. Both the primary and secondary cracks disturb the stress field and displacement field. The DEM simulation explains the initiation position of the primary and secondary cracks. The evolution of the displacement field and the stress field at different loading rates is analyzed. A new displacement field type is observed. The hole is easier to be broken by compression at higher loading rates while it tends to be broken by the coalescence crack at lower loading rates. The high loading rates lead to shielding effects of the hole on the pre-existing crack.",
keywords = "Compressive loading, Cracking processes, Defect, DEM, Loading rate, Rock",
author = "Shuai Zhou and Xiaoying Zhuang",
note = "Funding information: This work was supported by the Sofa-Kovalevskaja Award of Alexander von Humboldt Foundation .",
year = "2019",
month = mar,
doi = "10.1016/j.undsp.2018.08.001",
language = "English",
volume = "4",
pages = "22--30",
journal = "Underground Space (China)",
issn = "2096-2754",
publisher = "Tongji University Press",
number = "1",
}