Particle breakage model for coral sand under triaxial compression stress paths

WANG Zhao-nan; WANG Gang; YE Qin-guo; YIN Hao

doi:10.11779/CJGE202103017

Volume 43 Issue 3

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Chinese Journal of Geotechnical Engineering > 2021 > 43(3): 540-546. > DOI: 10.11779/CJGE202103017

WANG Zhao-nan, WANG Gang, YE Qin-guo, YIN Hao. Particle breakage model for coral sand under triaxial compression stress paths[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(3): 540-546. DOI: 10.11779/CJGE202103017

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Particle breakage model for coral sand under triaxial compression stress paths

WANG Zhao-nan^{1, 2,},
WANG Gang^{1, 2, ,},
YE Qin-guo^{1, 2},
YIN Hao^{1, 2}

1.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China
2.
School of Civil Engineering, Chongqing University, Chongqing 400045, China

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Received Date: February 02, 2020
Available Online: December 04, 2022

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Abstract

Abstract

Based on the triaxial experimental results of parallel specimens loaded under various axial strains, the intermediate particle breakage process of a coral sand is investigated, and the limitations of the energy-based breakage correlation and the popular stress-based Hardin breakage model are discussed. In order to reveal the characteristics of its intermediate accumulating process more conveniently, the particle breakage is decomposed into two parts based on the loading mechanisms: (1) compression-induced particle breakage associated with the increase of mean effective stress, and (2) shear-induced particle breakage related to the change of shear stress ratio. The amount of compression-induced particle breakage can be correlated to the current stress state. The accumulating rate of shear-induced particle breakage depends on both the shear strain and the accumulated amount of particle breakage during the past stress history. Two mathematical models are presented for the two particle breakage parts respectively, and the effectiveness of the two models is demonstrated by simulating the triaxial test results of the coral sand.
- particle breakage,
- coral sand,
- compression mechanism,
- shear mechanism

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References

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