Modelling of particle breakage of coarse aggregates incorporating strength and dilatancy

IF 0.3 Q4 ENGINEERING, GEOLOGICAL Geotechnical Engineering Pub Date : 2002-10-01 DOI:10.1680/GENG.2002.155.4.243

B. Indraratna, Wadud Salim

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引用次数: 163

Abstract

The degradation of coarse aggregates under shear stresses and its influence on the shear strength is studied, considering the energy consumption by particle breakage during shearing. An analytical model is developed relating the deviator stress ratio, dilatancy, friction angle and particle breakage under triaxial loading. Large-scale triaxial testing of latite basalt has been conducted, and the extent of particle breakage during shearing has been quantified. The breakage of particles under monotonic triaxial loading has been considered within the scope of this paper, and the modelling of particle breakage of aggregates under cyclic loading will be presented in a follow-up paper. The results show that the breakage of particles continues to increase beyond the peak deviator stress. The energy consumption by particle breakage is non-linearly related to the particle breakage index. The model also evaluates the effect of particle breakage on the friction angle of ballast. This study sheds further light on the basic angle of friction, which is independent of the breakage of particles during shearing.

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结合强度和剪胀的粗集料颗粒破碎模型

考虑剪切过程中颗粒破碎所消耗的能量，研究了粗集料在剪切应力作用下的降解及其对抗剪强度的影响。建立了三轴加载下偏应力比、剪胀、摩擦角和颗粒破碎的解析模型。对玄武岩进行了大型三轴试验，并对剪切过程中颗粒破碎程度进行了量化。本文已经考虑了单调三轴加载下的颗粒破碎问题，后续的文章将对循环加载下的集料颗粒破碎问题进行建模。结果表明，在峰值偏离应力之后，颗粒的破碎量继续增加。颗粒破碎能耗与颗粒破碎指数呈非线性关系。该模型还评估了颗粒破碎对压舱物摩擦角的影响。该研究进一步揭示了与剪切过程中颗粒破碎无关的基本摩擦角。

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来源期刊

Geotechnical Engineering ENGINEERING, GEOLOGICAL-

CiteScore

0.50

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0.00%

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期刊介绍： The objectives of the Association shall be the promotion of co-operation among geotechnical societies in SE Asia; and the assistance to member societies who have limited number of members. Now there is only one combined web titled: AGSSEA-SEAGS. SEAGS & AGSSEA encourage the submission of scholarly and practice-oriented articles to its journal. The journal is published quarterly. Both sponsors of the journal, the Southeast Asian Geotechnical Society and the Association of Geotechnical Societies in Southeast Asia, promote the ideals and goals of the International Society of Soil Mechanics and Geotechhnical Engineering in fostering communications, developing insights and enabling the advancement of the geotechnical engineering discipline.

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