Elastoplastic constitutive model for granular materials considering meso-particle damage

WANG Xiaochan; LAN Hengxing; LIU Shijie; SUN Weifeng

doi:10.11779/CJGE20240110

Volume 47 Issue 6

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Chinese Journal of Geotechnical Engineering > 2025 > 47(6): 1289-1297. > DOI: 10.11779/CJGE20240110

WANG Xiaochan, LAN Hengxing, LIU Shijie, SUN Weifeng. Elastoplastic constitutive model for granular materials considering meso-particle damage[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(6): 1289-1297. DOI: 10.11779/CJGE20240110

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Elastoplastic constitutive model for granular materials considering meso-particle damage

1.
School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China
2.
Key Laboratory of Ecological Geology and Disaster Prevention of Ministry of Natural Resources, Xi'an 710054, China
3.
State Key Laboratory of Resources and Environmental Information Systems, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

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Received Date: February 01, 2024
Available Online: September 12, 2024

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Abstract

Abstract

Establishing a constitutive model for granular materials that accounts for particle shape and breakage mechanisms has been crucial for calculating the mechanical stability of earth-rock dam projects. Initially, through the triaxial compression tests, the effects of particle breakage, rotation and sliding on the deformation of granular materials with varying shapes are examined. The particle slip/rotation is dominant at low stress level, and the energy dissipation is small. With the increase of the stress level, the influences of particle breakage are more prominent. Subsequently, the mathematical expressions for the particle crushing energy and dilatancy energy that consider particle shape are developed based on the geotechnical damage mechanics and thermodynamics. By incorporating the particle breakage rate equation, the evolution laws of particle crushing energy dilatancy energy, and breakage degree during compression are elucidated, quantitatively revealing the meso-particle breakage deformation mechanism. These mathematical relationships of meso-deformation mechanisms are integrated into the D-C model, then an elastoplastic constitutive model that considers both the particle shape and the meso-particle breakage mechanisms is derived. Finally, the validity and reliability of the proposed model are confirmed by comparing the experimental curves with the theoretical predictions.
- particle shape,
- particle breakage,
- particle crushing energy,
- crushing evolution law,
- constitutive model

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References

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