Study on particle loss-induced deformation of gap-graded soils: role of particle stress

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Kuang Cheng, Xinyu Ping, Buyao Han, Hao Wu, Hongshuai Liu
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Abstract

Deformation induced by finer particle loss is an important phenomenon during suffusion of gap-graded soils. This study focuses on the role of particle stress played in the particle loss-induced volumetric deformation. Discrete element simulations are performed to generate loss of finer particles with prescribed stress contribution, i.e. the contribution of particle stress to the macroscopic stress. Variations of volumetric strain, εv, with the stress contribution, Cσe, of eroded finer particles present two distinct patterns, that is, transition pattern, i.e. εv has extremely small values at relatively small Cσe and increases rapidly as Cσe exceeds the transition point near Cσe = 0.01%, and constant pattern, i.e. εv reaches a rather large value at extremely small Cσe and varies little with the increment of Cσe. A transformation from constant to transition pattern is observed for the εvCσe curves with the increment of the coordination number, Zstrong, of the load-carrying skeleton. The threshold of Zstrong for the transformation is around 3.71 for a relatively small eroded fraction (≤ 10%), while it is 3.96–4.09 for a relatively large eroded fraction (≥ 30%), in which the eroded fraction is the volume percentage of the eroded finer particles within the finer fraction.

Abstract Image

间隙级配土壤的颗粒损失诱导变形研究:颗粒应力的作用
细颗粒流失引起的变形是间隙级配土壤灌浆过程中的一个重要现象。本研究的重点是颗粒应力在颗粒流失引起的体积变形中所起的作用。通过离散元模拟来产生具有规定应力贡献的细颗粒损失,即颗粒应力对宏观应力的贡献。体积应变εv随侵蚀细颗粒的应力贡献Cσe的变化呈现出两种截然不同的模式,即过渡模式,即εv在相对较小的Cσe时具有极小值,并随着Cσe超过Cσe = 0.01%附近的过渡点而迅速增加;恒定模式,即εv在极小的Cσe时达到相当大的值,并随Cσe的增加而变化不大。随着承载骨架配位数 Zstrong 的增加,εv-Cσe 曲线会从恒定模式转变为过渡模式。对于相对较小的侵蚀部分(≤ 10%),转变的 Zstrong 临界值约为 3.71,而对于相对较大的侵蚀部分(≥ 30%),则为 3.96-4.09,其中侵蚀部分是侵蚀的较细颗粒在较细部分中所占的体积百分比。
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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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