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Research into compaction characteristics of large-size coarse-grained soil and application
European Journal of Environmental and Civil Engineering ( IF 2.1 ) Pub Date : 2022-08-23 , DOI: 10.1080/19648189.2022.2114945
Huayang Ye 1, 2 , Sheng Zhu 1, 2 , Shurong Feng 3 , Jing Xu 1, 2 , Yuqi Yang 1, 2 , Jiaqi Zhu 1, 2
Affiliation  

Abstract

The filling characteristic of rockfill is a non-ignorable engineering problem for high dams, and a reasonable control of compaction quality is the key to promoting the development of high dams. In this article, numerical and field tests were implemented to study the main problems affecting the compaction characteristics of large-size coarse-grained soil, namely determinations of the reasonable H0/dmax (the ratio of the compaction layer thickness to the maximum particle size) and the main influencing factors of minimum porosity. The macroscopic manifestations of the compaction characteristics were analyzed from the perspectives of energy, force chain, and particle breakage. The interaction between particles was explained by the ‘filling effect’ of fine particles, the ‘wedging effect’, and the ‘wall effect’ of coarse particles. It was found that the minimum porosity was not an inherent characteristic of rockfill, since the porosity and the corresponding degree of breakage were influenced by the compaction conditions. The value of H0/dmax meeting engineering practice was proposed, which can create favorable compaction conditions for obtaining the minimum porosity. Meantime, some suggestions were provided for obtaining the minimum porosity of large-size coarse-grained soil. The research results have an application reference value for the filling design and evaluation of high dams.



中文翻译:

大粒径粗粒土压实特性研究及应用

摘要

堆石料的充填特性是高坝不可忽视的工程问题,合理控制压实质量是推动高坝发展的关键。本文通过数值试验和现场试验,研究了影响大粒径粗粒土压实特性的主要问题,即合理的H 0 /d max确定(压实层厚度与最大粒径之比)和最小孔隙率的主要影响因素。从能量、力链、颗粒破碎等角度分析了压实特性的宏观表现。颗粒之间的相互作用可以用细颗粒的“填充效应”、“楔入效应”和粗颗粒的“壁效应”来解释。结果发现,最小孔隙率并不是堆石料的固有特性,因为孔隙率和相应的破碎程度受压实条件的影响。H 0 /d max的值提出了满足工程实际的方法,可以为获得最小孔隙率创造有利的压实条件。同时,对获取大粒径粗粒土的最小孔隙率提出了一些建议。研究成果对高坝填筑设计及评价具有应用参考价值。

更新日期:2022-08-23
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