Article
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Theoretical Models of Multiple Failure Mechanisms in Rock Materials
Version 1
: Received: 2 August 2024 / Approved: 4 August 2024 / Online: 6 August 2024 (05:00:27 CEST)
How to cite: Li, S.; Li, Y.; Fan, D.; Zhao, L.; Zhang, L. Theoretical Models of Multiple Failure Mechanisms in Rock Materials. Preprints 2024, 2024080231. https://doi.org/10.20944/preprints202408.0231.v1 Li, S.; Li, Y.; Fan, D.; Zhao, L.; Zhang, L. Theoretical Models of Multiple Failure Mechanisms in Rock Materials. Preprints 2024, 2024080231. https://doi.org/10.20944/preprints202408.0231.v1
Abstract
Rock materials failures are accompanied by the co-existence of various failure mechanisms, in-cluding rock fracturing, shearing, and compaction yield. These mechanisms manifest macro-scopically as multiple failure modes and nonlinear strength characteristics related to stress levels. Considering the limitations of current rock mechanics strength theories, which are primarily derived from single failure mechanisms, this study evaluates the applicability of alternative strength theories. Based on the extensional-strain criterion and the PMC (Paul-Mohr-Coulomb) model, a piecewise linear strength model was proposed that is suitable for analyzing multiple failure mechanisms in rocks and revealing the intrinsic mechanisms of multi-mechanism rock material failure. A multiple failure mechanism strength model in the form of inequalities was proposed, using the generalized shear stress, mean stress, and stress Lode angle as parameters. Strength tests conducted on sandstone and granite rock material samples under different stress conditions revealed distinct piecewise linear strength characteristics for both rock types, vali-dating the rationality and applicability of the multiple failure mechanism model. The findings construct a multi-mechanism failure model for rocks, providing enhanced predictive capabilities and aiding in the prevention of rock structural failures.
Keywords
transformation of failure mode; rock material strength criterion; extensional-strain criterion; Paul-Mohr-Coulomb model
Subject
Engineering, Mechanical Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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