大直径桩纵向振动广义轴对称连续圈层模型及其应用

刘鑫; 吴文兵; 王立兴; 刘浩; 梅国雄; 闻敏杰

doi:10.11779/CJGE20220671

大直径桩纵向振动广义轴对称连续圈层模型及其应用 English Version

刘鑫^{1, 2,},
吴文兵^{3, 4, ,},
王立兴³,
刘浩^{3, 4},
梅国雄⁵,
闻敏杰^{3, 6}

1.
中国地质大学海洋学院, 湖北武汉 430074
2.
中国地质大学深圳研究院, 广东深圳 518000
3.
中国地质大学工程学院, 湖北武汉 430074
4.
中国地质大学浙江研究院, 浙江杭州 311305
5.
广西大学工程防灾与结构安全教育部重点实验室, 广西南宁 530004
6.
浙江理工大学建工学院, 浙江杭州 310018

基金项目:

广东省基础与应用基础研究基金项目 2021A1515110547

国家自然科学基金项目 51878185

国家自然科学基金项目 52178321

浙江省自然科学基金杰出青年项目 LR21E080005

广西重点实验室开放课题项目 2021ZDK011

详细信息

作者简介:
刘鑫(1995—)，男，博士，副教授，主要从事桩基动力学及其动态测试技术方面的教学和科研工作。E-mail: ericoliu@126.com

通讯作者:
吴文兵, E-mail: zjuwwb1126@163.com

中图分类号: TU431
计量
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- HTML全文浏览量: 32
- PDF下载量: 79
出版历程
- 收稿日期: 2022-05-23
- 网络出版日期: 2023-03-05
- 刊出日期: 2023-08-31

Generalized axisymmetric continuous circle model for longitudinal vibration of large-diameter piles and its application

LIU Xin^{1, 2,},
WU Wenbing^{3, 4, ,},
WANG Lixing³,
LIU Hao^{3, 4},
MEI Guoxiong⁵,
WEN Minjie^{3, 6}

1.
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China
2.
Shenzhen Institute, China University of Geosciences, Shenzhen 518000, China
3.
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
4.
Zhejiang Institute, China University of Geosciences, Hangzhou 311305, China
5.
Key Laboratory of Disaster Prevention and Structural Safety, Ministry of Education, Guangxi University, Nanning 530004, China
6.
School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 300018, China

摘要

摘要: 现有针对大直径桩纵向振动特性的理论研究主要存在两点不足：①所用桩体模型无法充分考虑桩身内的三维波动效应；②研究重点集中于高频范围，缺乏对工程价值更为突出的低频振动特性的聚焦分析。针对此两点不足，提出了新型的大直径桩纵向振动广义轴对称连续圈层模型，将桩体看作三维连续介质，同时考虑桩身质点的竖向和径向位移，将桩周土沿径向进行圈层化处理，利用相邻圈层土和桩土接触面耦合关系得到竖向动荷载作用下桩顶复刚度解析解。在验证所提模型合理性基础上，利用其对大直径桩低频振动特性进行探讨分析，重点关注施工扰动效应的影响规律和机理，发现若干创新现象和有益结论，为大直径桩动力设计和承载特性分析提供了更为完备的理论基础。
- 大直径桩 /
- 广义轴对称连续圈层模型 /
- 施工扰动效应 /
- 低频振动特性 /
- 动力设计
Abstract: There exist two main deficiencies in the existing theoretical researches about the longitudinal vibration characteristics of large-diameter piles: (1) The pile models applied fail to consider sufficiently the three-dimensional (3D) wave effects of the pile body. (2) The dynamic characteristics within the low frequency range lack essential attention, which is much more important in practice. Regarding the two deficiencies, an innovative theoretical model called the generalized axisymmetric continuous circle model for investigating the longitudinal vibration of large-diameter piles is proposed. The pile is treated as the 3D continuous medium and the surrounding soil is stratified into several zones along the radial direction. The analytical solutions for the complex stiffness of the pile top are obtained by applying the coupled conditions between the adjacent soil zones and those at the pile-soil interface. After its rationality is verified, the proposed model is used to study the vibration characteristics of the large-diameter piles within the low frequency range. The laws and mechanisms of the construction disturbance effects are specifically discussed, and several new phenomena and useful conclusions are obtained, which may support a much more complete theoretical basis for the dynamic design and bearing capacity analysis of large-diameter piles.
- large-diameter pile /
- generalized axisymmetric continuous circle model /
- construction disturbance effect /
- low-frequency vibration characteristic /
- dynamic design

HTML全文

图 1 计算模型示意图

Figure 1. Sketch of computational model

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图 2 不同模型所得动刚度

Figure 2. Dynamic stiffnesses obtained by different models

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图 3 不同模型所得动阻尼

Figure 3. Dynamic dampings obtained by different models

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图 4 桩顶不同径向位置处的频域位移响应

Figure 4. Displacement responses of pile top points with different radial positions in frequency domain

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图 5 径向圈层划分数量影响分析

Figure 5. Influence analysis of radially stratified number

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图 6 硬化效应影响分析

Figure 6. Influence analysis of hardening effects

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图 7 软化效应影响分析

Figure 7. Influence analysis of softening effects

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图 8 扰动范围影响分析

Figure 8. Influence analysis of disturbance range

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图 9 桩径影响分析

Figure 9. Influence analysis of pile diameter

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表 1 不同硬化程度时各特征频率值

Table 1 Feature frequency values under different harding conditions

G_s1/MPa f₁/Hz f₂/Hz f₃/Hz

56 4.7 11.5 —

66 4.7 11.5 12.4

76 4.7 11.5 13.3

86 4.7 11.5 14.2

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表 2 不同软化程度时各特征频率值

Table 2 Feature frequency values under different softening conditions

G_s20/MPa f₁/Hz f₂/Hz f₃/Hz

56 4.7 11.5 —

66 5.1 11.5 12.4

76 5.5 11.5 13.3

86 4.7 11.5 14.2

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