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Rock Mechanics and Rock Engineering

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19.11.2020 | Original Paper

A Unified Constitutive Model for Rock Based on Newly Modified GZZ Criterion

verfasst von: Haohua Chen, Hehua Zhu, Lianyang Zhang

Erschienen in: Rock Mechanics and Rock Engineering | Ausgabe 2/2021

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Abstract

This paper proposes a unified constitutive model for rock based on the newly modified generalized Zhang-Zhu (GZZ) criterion. The constitutive model adopts a non-associated plastic flow rule and a continuous potential function that takes the three effective principal stresses into account. To reflect strain-softening, strain-hardening, and elastic-perfectly plastic behavior of rock in a unified way, a general expression is proposed to model the post-failure behavior of rock using the deviatoric plastic shear strain as the fundamental variable. The proposed constitutive model has been successfully implemented in a 3D finite-difference code and validated using it to simulate the true triaxial test of two types of rocks and comparing the simulation results with the experimental data. Finally, a 3D numerical model based on the proposed constitutive model is constructed to simulate a highway rock tunnel during construction. The results show that the predicted displacements of the rock tunnel are in good agreement with the field measurements.

Vorheriger Artikel Three-Dimensional Numerical Modeling of Grain-Scale Mechanical Behavior of Sandstone Containing an Inclined Rough Joint

Nächster Artikel Fast Equivalent Micro-Scale Pipe Network Representation of Rock Fractures Obtained by Computed Tomography for Fluid Flow Simulations

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Titel: A Unified Constitutive Model for Rock Based on Newly Modified GZZ Criterion
verfasst von: Haohua Chen
Hehua Zhu
Lianyang Zhang
Publikationsdatum: 19.11.2020
Verlag: Springer Vienna
Erschienen in: Rock Mechanics and Rock Engineering / Ausgabe 2/2021
Print ISSN: 0723-2632
Elektronische ISSN: 1434-453X
DOI: https://doi.org/10.1007/s00603-020-02293-y

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