Super-large-scale triaxial tests to study the effects of particle size on the monotonic stress–strain response of rockfill materials

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Fanwei Ning, Jingmao Liu, Degao Zou, Xianjing Kong, Gengyao Cui
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Abstract

Owing to the lack of super-large-scale triaxial apparatuses, the prediction of field behaviour involving rockfill materials is commonly based on laboratory test data, which are often unreliable due to size scaling. In this work, a newly developed super-large-scale triaxial apparatus able to accommodate a sample diameter of up to 1000 mm was introduced to analyse the effects of particle size on the monotonic stress–strain response of rockfill materials. A series of triaxial tests was conducted with maximum particle sizes dmax of 200 mm, 160 mm, and 60 mm in parallel grading to investigate the effects of particle size on the strength and deformation behaviour of Rumei rockfill materials. The results indicated that the peak friction angle ϕp, peak dilation angle ψp and secant modulus at 50% of the peak strength E50 decreased with increasing dmax and the particle breakage was enhanced as dmax increased. A unified linear relationship between ϕp and ψp was observed, regardless of dmax, and an equation considering dmax and the confining pressure was proposed to simulate E50. These rare super-large-scale triaxial data can provide a valuable reference for assessing the effects of particle size on the strength and deformation behaviour of rockfill materials.

采用超大尺寸三轴试验研究粒径对堆石料单调应力-应变响应的影响
由于缺乏超大尺寸的三轴装置,涉及堆石材料的现场行为预测通常基于实验室测试数据,由于尺寸缩放,这些数据往往不可靠。在这项工作中,引入了一种新开发的超大尺寸三轴装置,该装置可以容纳直径高达1000 mm的样品,以分析颗粒尺寸对堆石料单调应力-应变响应的影响。采用平行级配的三轴试验方法,对最大粒径dmax分别为200 mm、160 mm和60 mm,研究了粒径对如梅堆石料强度和变形特性的影响。结果表明:在峰值强度E50的50%处,峰值摩擦角ϕp、峰值膨胀角ψp和割线模量随着dmax的增大而减小,颗粒破碎量随着dmax的增大而增大;在不考虑dmax的情况下,观察到ϕp和ψp之间存在统一的线性关系,并提出了考虑dmax和围压的方程来模拟E50。这些罕见的超大尺度三轴数据可为评价粒径对堆石料强度和变形特性的影响提供有价值的参考。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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