- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | XU Dongdong, LU Bo, WU Aiqing, ZHU Jiebing, WANG Bin. Study on Complex Mechanical Behavior of Coarse Granular Materials Based on Continuous-Discontinuous Deformation Analysis[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240448
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To investigate the mechanical meso-mechanism and macroscopic response of coarse granular materials in rockfill dams, and to overcome the limitations of traditional continuum-based methods in simulating force chain evolution and particle breakage, a continuous-discontinuous deformation analysis method suitable for triaxial tests on coarse granular materials was developed. This method, based on the traditional discontinuous deformation analysis (DDA) framework, introduced a hybrid displacement mode to differentiate the mechanical responses of various blocks. Critical damping was employed to accelerate computational convergence, and a continuous-discontinuous simulation technique was proposed to characterize particle breakage. Through conventional triaxial numerical simulations, the deformation evolution, force chain development, particle breakage, and shear band formation during loading were analyzed, with particular emphasis on the effects of size and end friction. The results indicate that the simulation outcomes agree well with experimental data, reflecting both the macroscopic mechanical response and meso-mechanisms of coarse granular materials. The size effect leads to a 21.3% increase in peak stress under 0.4 MPa confining pressure, whereas its influence becomes negligible at 3.0 MPa. Under 3.0 MPa confining pressure, end friction contributes to an approximately 7.4% increase in peak stress. This study provides an effective numerical tool for further understanding the mechanical properties of coarse granular materials.
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