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Particle breakage and gradation evolution of rockfill materials during triaxial shearing based on the breakage energy
https://orcid.org/http://orcid.org/0000-0001-5102-1264
https://orcid.org/http://orcid.org/0000-0001-9827-6192
Rockfill has been used in numerous projects, including dams and embankments. The particle breakage of a rockfill occurs during the whole shearing process, which has a significant influence on the mechanical behaviors. However, particle breakage during shearing was poorly understood since previous studies focused on particle breaking after shearing. Characterizing the particle breakage based on the breakage energy (Eb) is the most straightforward way to disclose the particle breakage and gradation evolution of rockfill materials during triaxial shearing. The earlier back-calculated Eb, however, may be negative, which would violate the irreversible physical rule of particle breakage. In this paper, a reduction strategy for the friction coefficient is used to address the estimated Eb issue adequately. The fractal dimension and two frequently used particle breakage indices (Br and Bg) are demonstrated to be proportional to Eb under various confining pressures and various shearing strains. The predictions support the proposed model by demonstrating that the particle breakage indices and fractal dimension increase with increasing shear strain but at a decreasing rate toward a constant value, which is consistent with the observed evolution laws. Additionally, the proposed model may accurately predict the current gradation curve of rockfill under any triaxial stress state.
Particle breakage and gradation evolution of rockfill materials during triaxial shearing based on the breakage energy
https://orcid.org/http://orcid.org/0000-0001-5102-1264
https://orcid.org/http://orcid.org/0000-0001-9827-6192
Rockfill has been used in numerous projects, including dams and embankments. The particle breakage of a rockfill occurs during the whole shearing process, which has a significant influence on the mechanical behaviors. However, particle breakage during shearing was poorly understood since previous studies focused on particle breaking after shearing. Characterizing the particle breakage based on the breakage energy (Eb) is the most straightforward way to disclose the particle breakage and gradation evolution of rockfill materials during triaxial shearing. The earlier back-calculated Eb, however, may be negative, which would violate the irreversible physical rule of particle breakage. In this paper, a reduction strategy for the friction coefficient is used to address the estimated Eb issue adequately. The fractal dimension and two frequently used particle breakage indices (Br and Bg) are demonstrated to be proportional to Eb under various confining pressures and various shearing strains. The predictions support the proposed model by demonstrating that the particle breakage indices and fractal dimension increase with increasing shear strain but at a decreasing rate toward a constant value, which is consistent with the observed evolution laws. Additionally, the proposed model may accurately predict the current gradation curve of rockfill under any triaxial stress state.
Particle breakage and gradation evolution of rockfill materials during triaxial shearing based on the breakage energy
https://orcid.org/http://orcid.org/0000-0001-5102-1264
https://orcid.org/http://orcid.org/0000-0001-9827-6192
Rockfill has been used in numerous projects, including dams and embankments. The particle breakage of a rockfill occurs during the whole shearing process, which has a significant influence on the mechanical behaviors. However, particle breakage during shearing was poorly understood since previous studies focused on particle breaking after shearing. Characterizing the particle breakage based on the breakage energy (Eb) is the most straightforward way to disclose the particle breakage and gradation evolution of rockfill materials during triaxial shearing. The earlier back-calculated Eb, however, may be negative, which would violate the irreversible physical rule of particle breakage. In this paper, a reduction strategy for the friction coefficient is used to address the estimated Eb issue adequately. The fractal dimension and two frequently used particle breakage indices (Br and Bg) are demonstrated to be proportional to Eb under various confining pressures and various shearing strains. The predictions support the proposed model by demonstrating that the particle breakage indices and fractal dimension increase with increasing shear strain but at a decreasing rate toward a constant value, which is consistent with the observed evolution laws. Additionally, the proposed model may accurately predict the current gradation curve of rockfill under any triaxial stress state.
Particle breakage and gradation evolution of rockfill materials during triaxial shearing based on the breakage energy
Acta Geotech.
Guo, Wan-li (author) / Chen, Ge (author)
Acta Geotechnica ; 17 ; 5351-5358
2022-11-01
8 pages
Article (Journal)
Electronic Resource
English
Breakage energy , Gradation evolution , Particle breakage , Rockfill material , Triaxial test Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
| Taylor & Francis Verlag | 2021
Research on the Particle Breakage of Rockfill Materials during Triaxial Tests
| Online Contents | 2017