[1]崔春义,孟坤,梁志孟,等.基于饱和虚土桩模型的浮承桩纵向振动特性分析[J].东南大学学报(自然科学版),2019,49(2):356-361.[doi:10.3969/j.issn.1001-0505.2019.02.022]
 Cui Chunyi,Meng Kun,Liang Zhimeng,et al.Longitudinal vibration characteristics analysis on floating pile in frequency domain based on virtual saturated soil pile model[J].Journal of Southeast University (Natural Science Edition),2019,49(2):356-361.[doi:10.3969/j.issn.1001-0505.2019.02.022]
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基于饱和虚土桩模型的浮承桩纵向振动特性分析()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
49
期数:
2019年第2期
页码:
356-361
栏目:
土木工程
出版日期:
2019-03-20

文章信息/Info

Title:
Longitudinal vibration characteristics analysis on floating pile in frequency domain based on virtual saturated soil pile model
作者:
崔春义12孟坤1梁志孟1许成顺2杨刚1
1大连海事大学交通运输工程学院, 大连 116026; 2北京工业大学城市与工程安全减灾省部共建教育部重点实验室, 北京 100124
Author(s):
Cui Chunyi12 Meng Kun1 Liang Zhimeng1 Xu Chengshun2 Yang Gang1
1Transportation Engineering College, Dalian Maritime University, Dalian 116026, China
2Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China
关键词:
饱和虚土桩 平面应变 桩底土 纵向振动 动力阻抗
Keywords:
saturated virtual soil pile plane strain soil beneath the pile toe longitudinal vibration dynamic impedance
分类号:
TU473.1
DOI:
10.3969/j.issn.1001-0505.2019.02.022
摘要:
为了分析饱和土中浮承桩纵向振动特性,基于Biot理论提出了一种桩底饱和虚土桩模型.采用Novak薄层法计算得出饱和土体位移解,利用饱和土-桩-饱和虚土桩完全耦合条件,推导出桩顶纵向振动动力阻抗解析解,并对饱和土中浮承桩纵向振动特性进行参数化分析.计算结果表明,当桩底饱和土层厚度为4和6 m时,桩顶动力阻抗函数曲线呈现出大、小峰值交替现象,这与单相虚土桩模型的计算结果差异较大,且桩周和桩底饱和土体孔隙率对桩顶动力阻抗曲线的影响不可忽视.当桩底土饱和性显著且排水性较差时,桩底土单相虚土桩模型会引起较大误差,宜采用饱和虚土桩模型和所得相关解析解答分析浮承桩纵向振动特性.
Abstract:
To study the longitudinal vibration characteristics of floating pile in saturated soil, a saturated virtual soil pile model based on Biot’s theory of wave propagation was proposed. The analytical solution for the displacement of saturated soil was derived by the Novak plane strain method. Then, the vertical dynamic impedance at the pile head was obtained by adopting the saturated soil-pile-saturated virtual soil pile completely compatibility condition. The extensive parametric analysis was performed to investigate the effects of the parameters of the saturated soil on the vibration characteristics at the pile head. The computational results show that when the thickness of the saturated soil layer beneath the pile toe is 4 and 6 m, the alternating phenomenon of large and small peaks is presented, which is different from the calculation results of the single-phase virtual soil pile model, and the influence of porosity of saturated soil beneath the pile toe and surrounding soil on the dynamic impedance curve at the pile head cannot be ignored. The single-phase virtual soil pile model of soil can lead to considerable errors when the saturation of soil layers beneath the pile toe is remarkable and the drainage is poor. The saturated virtual soil pile model and the relevant analytical solution are more suitable for analyzing the longitudinal vibration characteristics of floating pile.

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备注/Memo

备注/Memo:
收稿日期: 2018-09-06.
作者简介: 崔春义(1978—),男,副教授,博士生导师, cuichunyi@.dlmu.edu.cn.
基金项目: 国家自然科学基金面上资助项目(51578100, 51722801, 51878109)、中央高校基本科研业务费专项资金资助项目(3132014326,3132018110)、北京工业大学城市与工程安全减灾教育部重点实验室开放基金资助项目(201501).
引用本文: 崔春义,孟坤,梁志孟,等.基于饱和虚土桩模型的浮承桩纵向振动特性分析[J].东南大学学报(自然科学版),2019,49(2):356-361. DOI:10.3969/j.issn.1001-0505.2019.02.022.
更新日期/Last Update: 2019-03-20