预制桩作为深基坑支护的土拱效应的数值和理论分析

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
Qianwei Xu , Jinli Xie , Linhai Lu , Yongji Wang , Chaojun Wu , Qiang Meng
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引用次数: 0

摘要

本研究对深基坑(DFP)内的土拱效应进行了详细调查,重点关注其力学行为和对结构设计的影响。通过严格的三维有限元建模和参数敏感性分析,研究探讨了土拱现象的形成、几何特征和空间分布。研究涵盖了弹性模量、内聚力和内摩擦角等关键参数对土壤起拱效应的影响。研究结果表明,DFP 内的土壤起拱现象具有明显的空间特征,随着挖掘深度的增加,突出的拱轴也会发生变化。当桩间距接近桩直径的三倍时,可观察到最佳的土壤起拱效果,从而增强土壤保持力,并将变形风险降至最低。敏感性分析凸显了土壤参数对土壤起拱行为的重要影响,强调了内聚力和内摩擦角在塑造起拱特性中的关键作用。通过阐明土壤参数与土壤起拱效应之间的相互作用,该研究为优化桩间距和结构稳定性提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical and theoretical analysis on soil arching effect of prefabricated piles as deep foundation pit supports

This study presents a detailed investigation into the soil arching effects within deep foundation pits (DFPs), focusing on their mechanical behavior and implications for structural design. Through rigorous 3D finite element modeling and parameter sensitivity analyses, the research explores the formation, geometric characteristics, and spatial distribution of soil arching phenomena. The investigation encompasses the influence of key parameters such as elastic modulus, cohesion, and internal friction angle on the soil arching effect. The findings reveal that soil arching within DFPs exhibits distinct spatial characteristics, with the prominent arch axis shifting as excavation depth progresses. Optimal soil arching is observed when the pile spacing approximates three times the pile diameter, enhancing soil retention and minimizing deformation risks. Sensitivity analyses highlight the significant impact of soil parameters on soil arching behavior, underscoring the critical role of cohesive forces and internal friction angles in shaping arching characteristics. By elucidating the interplay between soil parameters and soil arching effects, the research provides insights for optimizing pile spacing and structural stability.

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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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