非饱和地层中水泥改良土增强管桩横向动力行为的分析方法

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-07-26 DOI:10.1007/s11440-024-02373-1
Hongbo Liu, Guoliang Dai, Fengxi Zhou, Haoran OuYang, Jun Liu
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引用次数: 0

摘要

与传统桩基相比,采用水泥改良土加固的管桩(以下简称加固管桩)具有优异的承载能力,通常用作海上风力涡轮机和海岸软土堤坝的基础。本研究旨在通过开发一种分析方法,阐明并深入了解增强管桩在非饱和土中的横向动力响应。在建议的方法中,增强管桩分为两部分:第一部分是由混凝土管桩和水泥土搅拌桩通过高强度粘结形成的复合桩,第二部分是由混凝土管桩和非饱和土柱形成的复合桩。分别采用欧拉-伯努利梁理论和三相混合物多孔粘弹性理论推导了增强管桩和非饱和土抗力的横向振动行为。确定了水平动荷载作用下增强管桩桩头的水平动阻抗、摇摆动阻抗和水平-摇摆动阻抗的闭式解,并与现有结果进行了对比验证。最后进行了数值讨论,分析了增强管桩和非饱和土的物理参数对桩头三种动阻抗的影响。主要结论可归纳如下(a) 对于水泥土搅拌桩,其长度不应超过混凝土管桩的一半,半径大小应适中,弹性模量可尽可能大;(b) 可适当增加混凝土管桩的壁厚和弹性模量,使增强管桩获得更好的抗振性;(c) 土的饱和度增加会降低增强管桩的抗振能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Analytical approach for lateral dynamic behaviours of pipe piles enhanced by cement-improved soil in unsaturated ground

Pipe piles enhanced by cement-improved soil (hereinafter referred to as enhanced pipe piles) have excellent bearing capacity compared with traditional piles and are often used as the foundation of offshore wind turbines and coastal soft-soil embankment. This study aims to clarify and gain an insight into the lateral dynamic response of enhanced pipe piles in unsaturated soil by developing an analytical approach. In the proposed approach, the enhanced pipe pile divides into two parts: The first part is considered as a composite pile formed by a concrete pipe pile and a cement-soil mixing pile through high-strength bonding, and the second part formed by a concrete pipe pile and an unsaturated soil column. The lateral vibration behaviours of the enhanced pipe pile and the unsaturated soil resistance are deduced by the Euler–Bernoulli beam theory and the porous viscoelastic theory of three-phase mixture, respectively. The closed-form solutions for the horizontal, rocking and horizontal-rocking dynamic impedances at the pile head of enhanced pipe pile under horizontal dynamic loads have been determined and then validated by comparing with the existing results. Numerical discussions are finally conducted to analysis the influence of physical parameters of enhanced pipe pile and unsaturated soil on the three types of dynamic impedance at the pile head. The main findings can be summarized as: (a) For the cement-soil mixing pile, its length should not exceed half of the concrete pipe pile, its radius size should be moderate and its elastic modulus can be as large as possible; (b) the wall thickness and elastic modulus of the concrete pipe pile can be appropriately increased to make the enhanced pipe pile achieve better vibration resistance and (c) the increase of the soil saturation will reduce the anti-vibration ability of enhanced pipe piles.

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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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