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Modeling time-dependent mechanical behavior of hard rock considering excavation-induced damage and complex 3D stress states

Urheber*innen

Yu,  Peiyang
External Organizations;

Ding,  Xiuli
External Organizations;

Pan,  Peng-Zhi
External Organizations;

/persons/resource/shuting

Miao,  Shuting
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Wang,  Zhaofeng
External Organizations;

Huang,  Shuling
External Organizations;

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Zitation

Yu, P., Ding, X., Pan, P.-Z., Miao, S., Wang, Z., Huang, S. (2024 online): Modeling time-dependent mechanical behavior of hard rock considering excavation-induced damage and complex 3D stress states. - Journal of Rock Mechanics and Geotechnical Engineering.
https://doi.org/10.1016/j.jrmge.2024.03.009


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5026272
Zusammenfassung
To investigate the long-term stability of deep rocks, a three-dimensional (3D) time-dependent model that accounts for excavation-induced damage and complex stress state is developed. This model com- prises three main components: a 3D viscoplastic isotropic constitutive relation that considers excavation damage and complex stress state, a quantitative relationship between critical irreversible deformation and complex stress state, and evolution characteristics of strength parameters. The proposed model is implemented in a self-developed numerical code, i.e. CASRock. The reliability of the model is validated through experiments. It is indicated that the time-dependent fracturing potential index (xTFPI) at a given time during the attenuation creep stage shows a negative correlation with the extent of excavation- induced damage. The time-dependent fracturing process of rock demonstrates a distinct interval effect of the intermediate principal stress, thereby highlighting the 3D stress-dependent characteristic of the model. Finally, the influence of excavation-induced damage and intermediate principal stress on the time-dependent fracturing characteristics of the surrounding rocks around the tunnel is discussed. Ó 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).