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Published in: Bulletin of Engineering Geology and the Environment 6/2022

01-06-2022 | Original Paper

Particle breakage and shape analysis of calcareous sand under consolidated-undrained triaxial shear

Authors: Jianhua Shen, Xing Wang, Yi Shan, Jie Cui, Xiang Chen, Xinzhi Wang, Changqi Zhu

Published in: Bulletin of Engineering Geology and the Environment | Issue 6/2022

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Abstract

To investigate the meso-fabric characteristics of calcareous sand (CS) under undrained shear conditions, multiple consolidated-undrained triaxial shear tests were conducted on CS under different effective confining pressures (\({\sigma }_{3}^{^{\prime}}\)), and the particle gradations and shapes of CS before and after triaxial shear tests were measured using screening tests and particle shape scanning tests, respectively. According to the results, (I) the consolidated-undrained triaxial shear tests on CS can be regarded as a process of transforming from weakening frictional strength to reinforcing cohesive strength. (II) The relative breakage ratio (Br) and modified relative breakage index (\({\text{Br}}^{*}\)) of CS both increased in power function form with increasing \({\sigma }_{3}^{^{\prime}}\). The Br of CS was less than its \({\text{Br}}^{*}\) under the same \({\sigma }_{3}^{^{\prime}}\) . The connection between the Br and plastic work of CS under undrained shear conditions was established. Splitting and abrasion were the main particle breakage patterns of CS during consolidated-undrained triaxial shear. (III) After consolidated-undrained triaxial shear tests, the particle shape of CS became increasingly regular. Due to the diversity of particle breakage patterns, the mean particle shape parameter of CS did not show any monotonic change with increasing \({\sigma }_{3}^{^{\prime}}\).

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Metadata
Title
Particle breakage and shape analysis of calcareous sand under consolidated-undrained triaxial shear
Authors
Jianhua Shen
Xing Wang
Yi Shan
Jie Cui
Xiang Chen
Xinzhi Wang
Changqi Zhu
Publication date
01-06-2022
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 6/2022
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-022-02685-0

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