A Damage Constitutive Model for a Jointed Rock Mass under Triaxial Compression
Publication: International Journal of Geomechanics
Volume 23, Issue 6
Abstract
Due to the different structural characteristics and in situ environment, jointed rock masses encounter different failure mechanisms. Because of the joints, jointed rock masses show peculiar characteristics such as anisotropy and weakening. To describe the deformation and failure mechanism in jointed rock masses, a novel damage constitutive model of rock mass is proposed here considering the geometric parameters and mechanical properties of joints. A total damage variable is derived on the basis of the strain equivalence hypothesis, which combines the Weibull statistical damage theory for the strength of the rock elements and the fracture mechanics model for joints. This new damage variable reflects the coupled damage inflicted by two damage states, one is initial damage induced by prefabricated joints and the other is joint damage and rock mesoscopic damage under loading. The damage evolution path revealed by the new damage variable corresponds to the evolution of mechanical properties and behaviors induced by changes in the rock mass structure. Afterward, the computational formulation scheme for the model parameters is deduced using the extremum method. The model parameters, m and F0, have a clear physical meaning. The parameter m describes the ductility–brittleness characteristics of jointed rock masses, and F0 reflects the level of strength. This model describes the effect of joints and strain on the evolution of rock mass damage, model parameters, deformation, and failure characteristics. The mechanical behavior of rock mass described by the damage model and the change law of model parameters are consistent with the published experimental results.
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Acknowledgments
The authors are grateful for financial support from the National Natural Science Foundation of China (Nos. 12172280, 42177144, and 41907259) and the Project Supported by the Natural Science Foundation of Shaanxi Province of China (2020JZ-53).
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Published In
International Journal of Geomechanics
Volume 23 • Issue 6 • June 2023
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© 2023 American Society of Civil Engineers.
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Received: Mar 21, 2022
Accepted: Dec 19, 2022
Published online: Mar 22, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 22, 2023
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