可破碎颗粒边角对钙质砂中隆起桩-土相互作用行为的影响分析

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-07-09 DOI:10.1007/s11440-024-02367-z
Yu Peng, Zhen-Yu Yin, Fengchun Yang, Liming Qu, Xuanming Ding
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引用次数: 0

摘要

在桩土相互作用的研究中,可破碎颗粒边角的影响往往被忽视,这阻碍了对钙质砂中隆起桩行为的理解。本研究通过模型试验和离散元法-有限差分耦合法,从宏观到微观研究了可破碎角对钙质砂中隆起桩-土相互作用的影响。结果表明,与硅砂相比,钙质砂中的翘起桩具有更高的承载力和相对突然的破坏行为,这分别归因于边角交错效应和边角断裂效应。角交错和断裂的耦合效应彻底解释了石灰砂中不稳定的荷载沿桩的传递。此外,有效接触的减少和土壤骨架的改变也被认为是导致钙质砂土行为独特的关键因素。此外,研究还发现,颗粒的相对滑动距离是决定转角处应力集中导致转角破损量的关键因素。最后,研究还提出了一个涉及边角断裂效应的正反馈循环,成功解释了钙质砂土中桩身隆起的独特现象。这项研究为阐明钙质砂中独特的桩土相互作用行为提供了新的视角。
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Analysis of the effect of breakable particle corners on uplift pile–soil interaction behaviors in calcareous sand

The effect of breakable particle corners is often overlooked in research on pile–soil interaction, which hinders the understanding of the uplift pile behaviors in calcareous sand. This research examines the breakable corner effects on uplift pile–soil interaction in calcareous sand from macro to micro, through model tests and coupled discrete element method–finite difference method. Results revealed that compared to that in silica sand, the higher bearing capacity and relatively abrupt failure behavior of uplift piles in calcareous sands were attributed to the corner interlocking effect and corner breakage effect, respectively. The unstable load transmission along piles in calcareous sand was thoroughly explained by a coupled effect of corner interlocking and breakage. Furthermore, the reduction in effective contacts and alterations in soil skeletons were identified as critical factors contributing to the distinctive soil behaviors in calcareous sand. Moreover, the relative sliding distance of particles was found to be the key factor in determining the amount of corner breakages due to stress concentration at corners. Lastly, a positive feedback loop involving corner breakage effects was proposed, successfully explaining the distinctive phenomenon of uplift piles in calcareous sand. This study provides new perspectives to clarify distinctive pile–soil interaction behaviors in calcareous sand.

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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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