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Elastoplastic constitutive model of coral sand considering particle breakage based on unified hardening parameter
Marine Georesources & Geotechnology ( IF 2.2 ) Pub Date : 2021-05-14 , DOI: 10.1080/1064119x.2021.1924321
Ruiming Liu 1, 2 , Heying Hou 3 , Yuanyi Chen 1 , Pan Ming 4 , Xun Zhu 1
Affiliation  

Abstract

Particle breakage is a significant phenomenon that distinguishes coral sand from other granular materials. This study aims to build an elastoplastic constitutive model which can describe the mechanical behaviour of coral sand at different relative densities and confinement conditions. According to the results of triaxial compression test and isotropic compression test, the expression of the critical state line (CSL) considering particle breakage and a new hardening rule based on unified hardening parameter was proposed, respectively. A shape parameter of yield surface which incorporates the impact of particle breakage and relative density simultaneously was defined. Then, an elastoplastic constitutive model of coral sand considering the particle breakage and relative density was established by introducing the new hardening rule and the shape parameter. By comparing the results of triaxial compression tests with that of the elastoplastic constitutive model, the model was proved to be able to predict the mechanical behaviour of coral sand at different relative densities and confining pressures.



中文翻译:

基于统一硬化参数的考虑颗粒破碎的珊瑚砂弹塑性本构模型

摘要

颗粒破碎是区分珊瑚砂与其他颗粒材料的重要现象。本研究旨在建立一个弹塑性本构模型,该模型可以描述珊瑚砂在不同相对密度和约束条件下的力学行为。根据三轴压缩试验和各向同性压缩试验结果,分别提出了考虑颗粒破碎的临界状态线(CSL)表达式和基于统一硬化参数的新硬化规则。定义了同时包含颗粒破碎和相对密度影响的屈服面形状参数。然后,通过引入新的硬化规则和形状参数,建立了考虑颗粒破碎和相对密度的珊瑚砂弹塑性本构模型。通过将三轴压缩试验结果与弹塑性本构模型的结果进行比较,证明该模型能够预测不同相对密度和围压下珊瑚砂的力学行为。

更新日期:2021-05-14
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