A Hybrid Anisotropic Elastoplastic Model for Layered Rock Mass and Numerical Implementation
Publication: International Journal of Geomechanics
Volume 23, Issue 4
Abstract
An elastoplastic model that exhibits hybrid initial and stress-induced anisotropy is developed for layered rock masses. The formulation considers the thermodynamic aspect, and is consistent and rigorous. Both initial anisotropy and stress-induced deformation anisotropy are reflected by a hybrid anisotropic stiffness matrix influenced by the deterioration development degree (DDD) in different directions. By employing a combination of the strength criterion of rock material and rock bedding plane, an anisotropic failure formulation for layered rock mass has been established. The hybrid anisotropic model has been implemented in cellular automata software for the engineering rock mass fracturing process (CASRock). The performance of the anisotropic part is demonstrated by reproducing the deformation and failure characteristics of initial or stress-induced anisotropic behaviors for layered rocks under uniaxial, conventional triaxial, and true triaxial compression and Brazilian splitting conditions. Important features, such as the strength, mechanism, deformation, DDD, and fracturing process variation, can be captured by the proposed model. In addition, a numerical simulation of tunnel excavation in a layered rock mass is performed to study the anisotropic excavation-induced damage zone (EDZ) distribution in the field. The results indicate that the model is able to reproduce the observed failure mode satisfactorily.
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Acknowledgments
This work was funded by the National Natural Science Foundation of China (Grant Nos. 52125903, 51621006). We are deeply grateful to Professor Xia-Ting Feng and Mr. Xiaojun Yu from Northeastern University for providing us with the true triaxial compression loading condition in quantitative verification of our model. We also thank Ms Mengping Du, Mr Zhenhua Wu, Mr Peiyang Yu, and Ms Shuting Miao for conducting the experiments and simulations.
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Published In
International Journal of Geomechanics
Volume 23 • Issue 4 • April 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Mar 13, 2022
Accepted: Nov 27, 2022
Published online: Jan 27, 2023
Published in print: Apr 1, 2023
Discussion open until: Jun 27, 2023
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