Assessment of shear band evolution using discrete element modelling

IF 1.5 4区 工程技术 Q3 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Yang Yang, Yinghui Tian, Runyu Yang, Chunhui Zhang, Le Wang
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引用次数: 0

Abstract

Purpose

The objective of this paper is to quantitatively assess shear band evolution by using two-dimensional discrete element method (DEM).

Design/methodology/approach

The DEM model was first calibrated by retrospectively modelling existing triaxial tests. A series of DEM analyses was then conducted with the focus on the particle rotation during loading. An approach based on particle rotation was developed to precisely identify the shear band region from the surrounding. In this approach, a threshold rotation angle ω0 was defined to distinguish the potential particles inside and outside the shear band and an index g(ω0) was introduced to assess the discrepancy between the rotation response inside and outside shear band. The most distinct shear band region can be determined by the ω0 corresponding to the peak g(ω0). By using the proposed approach, the shear band development of two computational cases with different typical localised failure patterns were successfully examined by quantitatively measuring the inclination angle and thickness of shear band, as well as the microscopic quantities.

Findings

The results show that the shear band formation is stress-dependent, transiting from conjugated double shear bands to single shear band with confining stress increasing. The shear band evolution of two typical localised failure modes exhibits opposite trends with increasing strain level, both in inclination angle and thickness. Shear band featured a larger volumetric dilatancy and a lower coordination number than the surrounding. The shear band also significantly disturbs the induced anisotropy of soil.

Originality/value

This paper proposed an approach to quantitatively assess shear band evolution based on the result of two-dimensional DEM modelling.

利用离散元素模型评估剪切带的演变
本文旨在利用二维离散元素法(DEM)对剪切带的演变进行定量评估。设计/方法/途径首先通过对现有的三轴试验进行建模,对 DEM 模型进行校准。然后进行了一系列 DEM 分析,重点是加载过程中的颗粒旋转。开发了一种基于颗粒旋转的方法,以从周围精确识别剪切带区域。在这种方法中,定义了一个阈值旋转角 ω0 来区分剪切带内外的潜在颗粒,并引入了一个指数 g(ω0)来评估剪切带内外旋转响应之间的差异。与峰值 g(ω0) 相对应的ω0 可以确定最明显的剪切带区域。结果表明,剪切带的形成与应力有关,随着约束应力的增加,剪切带会从共轭双剪切带过渡到单剪切带。随着应变水平的增加,两种典型局部破坏模式的剪切带演变在倾斜角和厚度上都呈现出相反的趋势。剪切带具有比周围更大的体积膨胀率和更低的配位数。本文提出了一种基于二维 DEM 建模结果定量评估剪切带演变的方法。
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
Engineering Computations
Engineering Computations 工程技术-工程:综合
CiteScore
3.40
自引率
6.20%
发文量
61
审稿时长
5 months
期刊介绍: The journal presents its readers with broad coverage across all branches of engineering and science of the latest development and application of new solution algorithms, innovative numerical methods and/or solution techniques directed at the utilization of computational methods in engineering analysis, engineering design and practice. For more information visit: http://www.emeraldgrouppublishing.com/ec.htm
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