Stress Fluctuations in Triaxial Testing Of Angular Grains

IF 0.8 4区工程技术 Q4 ENGINEERING, CIVIL

Teknik Dergi Pub Date : 2021-07-01 DOI:10.18400/tekderg.573637

Aydın Özbay, A. Cabalar

引用次数: 0

Abstract

Stress fluctuations caused by stick-slip instabilities are frequently encountered in laboratory shear testings of granular materials. It is not common to observe stick-slips in angular-shaped granular assemblies, although rounded particles are more prone to this type of behaviour. This paper specifically concerns the deviatoric stress fluctuations in the shearing of coarse angular glass granules. A systematic experimental program comprising triaxial compression tests was realized to investigate the effects of particle size, confining pressure, and strain rate on the stick-slip mechanism. Particle size effect was examined by adopting three separate size distributions. In order to understand the influences of testing conditions on the stress fluctuations, the specimens were tested under four different confining pressures and by applying two distinct strain rates. The results showed that both the particle size and confining pressure greatly affected the stress fluctuations whereas the influence of strain rate was unclear.

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角晶粒三轴试验中的应力波动

在颗粒材料的实验室剪切试验中，粘滑不稳定性引起的应力波动是经常遇到的问题。虽然圆形颗粒更容易发生这种行为，但在棱角状颗粒组合中观察到粘滑现象并不常见。本文专门研究了粗角玻璃颗粒剪切过程中的偏应力波动。通过系统的三轴压缩试验，研究了粒径、围压和应变速率对粘滑机理的影响。采用三种不同的粒径分布考察了粒径效应。为了了解试验条件对应力波动的影响，在4种不同围压和2种不同应变速率下对试件进行了试验。结果表明:颗粒尺寸和围压对应力波动影响较大，应变速率对应力波动影响不明显;

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

Teknik Dergi 工程技术-工程：土木

自引率

30.80%

发文量

审稿时长

>12 weeks

期刊介绍： The scope of Teknik Dergi is naturally confined with the subjects falling in the area of civil engineering. However, the area of civil engineering has recently been significantly enlarged, even the definition of civil engineering has somewhat changed. Half a century ago, engineering was simply defined as “the art of using and converting the natural resources for the benefit of the mankind”. Today, the same objective is expected to be realised (i) by complying with the desire and expectations of the people concerned and (ii) without wasting the resources and within the sustainability principles. This change has required an interaction between engineering and social and administrative sciences. Some subjects at the borderline between civil engineering and social and administrative sciences have consequently been included in the area of civil engineering. Teknik Dergi defines its scope in line with this understanding. However, it requires the papers falling in the borderline to have a significant component of civil engineering.