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Geomechanics and Engineering Volume 36, Number 2, January25 2024 , pages 121-130 DOI: https://doi.org/10.12989/gae.2024.36.2.121 |
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Damage evolution of red-bed soft rock: Progressive change from meso-texture to macro-deformation |
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Guangjun Cui, Cuiying Zhou, Zhen Liu and Lihai Zhang
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| Abstract | ||
| Many foundation projects are built on red-bed soft rocks, and the damage evolution of this kind of rocks affects the safety of these projects. At present, there is insufficient research on the damage evolution of red-bed soft rocks, especially the progressive process from mesoscopic texture change to macroscopic elastoplastic deformation. Therefore, based on the dual-porosity characteristics of pores and fissures in soft rock, we adopted a cellular automata model to simulate the propagation of these voids in soft rocks under an external load. Further, we established a macro–mesoscopic damage model of red-bed soft rocks, and its reliability was verified by tests. The results indicate that the relationship between the number and voids size conformed to a quartic polynomial, whereas the relationship between the damage variable and damage porosity conformed to a logistic curve. The damage porosity was affected by dual-porosity parameters such as the fractal dimension of pores and fissures. We verified the reliability of the model by comparing the test results with an established damage model. Our research results described the progressive process from mesoscopic texture change to macroscopic elastoplastic deformation and provided a theoretical basis for the damage evolution of these rocks. | ||
| Key Words | ||
| damage evolution; elastoplastic deformation; fissures; pores; red-bed soft rocks | ||
| Address | ||
| Guangjun Cui: Institute of Estuarine and Coastal Research/Guangdong Provincial Engineering Research Center of Coasts, Islands and Reefs, School of Ocean Engineering and Technology, Sun Yat-sen University, Guangzhou 510275, China; Guangdong Engineering Research Centre for Major Infrastructure Safety, Sun Yat-sen University, Guangzhou 510275, China Cuiying Zhou and Zhen Liu: Guangdong Engineering Research Centre for Major Infrastructure Safety, Sun Yat-sen University, Guangzhou 510275, China Lihai Zhang: Department of Infrastructure Engineering, The University of Melbourne, Melbourne VIC 3010, Australia | ||