Exploring the undrained behaviour of granular clumps after isotropic and Ko-consolidation paths using DEM

IF 3.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shiva Prashanth Kumar Kodicherla , Minyi Zhu , Guobin Gong , Stephen Wilkinson
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Abstract

This paper investigates the undrained behaviour of granular clumps after isotropic and Ko-consolidation paths using a three-dimensional discrete element method (3D-DEM). Four randomly chosen clumped particles with a wide range of densification indexes, ID, and mean confining stresses, p' were considered. The specimens were sheared to the deviatoric strain, εq of 40 % to reach the critical state (CS) conditions. It was found from the results that a unique critical state line (CSL) was achieved, irrespective of consolidation paths. The micro-mechanical quantities such as the average coordination number (CN) and von Mises fabric in terms of the second invariant of deviatoric fabric, FvM, also reached CS values. Irrespective of the consolidation paths, unique relationships were found between elog(p)and CNlog(p). The stress-fabric joint invariant, KF established a unique relationship with pand e, which forms a relationship in the KFpe space and the projection of this relationship in the elog(p) plane confirms the classical CSL. Moreover, the flow potential (uF), stress ratio at instability (ηIS), and average coordination number at instability (CNIS) showed no dependency on the consolidation paths, while a dependency was observed for the second-order deviator fabric, FvM.

利用DEM探索各向同性和ko固结路径后颗粒团块的不排水行为
本文采用三维离散元方法(3D-DEM)研究了各向同性和Ko固结路径后颗粒团块的不排水行为。考虑了四个随机选择的块状颗粒,它们具有广泛的致密化指数ID和平均围压p'。将试样剪切至40%的偏应变εq,以达到临界状态(CS)条件。从结果中发现,无论固结路径如何,都实现了独特的临界状态线(CSL)。微观力学量,如平均配位数(CN)和偏组构的第二不变量FvM的von Mises组构,也达到了CS值。无论固结路径如何,e−log(p′)和CN−log(p′)之间都存在独特的关系。应力组构联合不变量KF与p′和e建立了一种独特的关系,在KF−p′−e空间中形成了一种关系,这种关系在e−log(p′)平面中的投影证实了经典CSL。此外,流动势(uF)、失稳应力比(ηIS)和失稳平均配位数(CNIS)与固结路径无关,而二阶偏组构FvM则存在相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Forces in mechanics
Forces in mechanics Mechanics of Materials
CiteScore
3.50
自引率
0.00%
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0
审稿时长
52 days
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