非饱和土中单桩的横向瞬态响应研究

刘圆圆; 孙箭林

doi:10.13204/j.gyjzG20052007

非饱和土中单桩的横向瞬态响应研究

doi: 10.13204/j.gyjzG20052007

刘圆圆¹,
孙箭林²

1. 江西建设职业技术学院, 南昌 330052;
2. 江西师范大学, 南昌 330022

基金项目:

江西省教育厅科学技术研究项目（GJJ191386）。

详细信息

作者简介:
刘圆圆,女,1988年出生,硕士,讲师。电子信箱:348364820@qq.com

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- 文章访问数: 55
- HTML全文浏览量: 6
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2020-05-20
- 网络出版日期: 2021-06-04

TIME DOMAIN DYNAMIC ANALYSIS OF SINGLE PILES SUBJECTED TO IMPACT LOADS IN UNSATURATED SOIL

LIU Yuanyuan¹,
SUN Jianlin²

1. Jiangxi College of Construction, Nanchang 330052, China;
2. Jiangxi Normal University, Nanchang 330022, China

摘要

摘要: 基于非饱和土的动力控制方程，对非饱和土中单桩的水平瞬态响应进行分析。先利用Laplace变换，再对方程进行无量纲化，建立了变换域内非饱和土的水平波动方程，通过分离变量法及算子分解理论得到了Laplace变换域内的位移解；根据桩-土接触面的边界条件求解桩的动力平衡方程，得到变换域内的桩身位移和内力的解析解，再通过Laplace逆变换进行数值计算，分析饱和度、桩-土模量比、冲击荷载持时等对振动特性的影响。结果表明：饱和度对桩身位移和内力有一定影响；且桩-土模量比越大，饱和度的影响越显著；冲击荷载加载时间越长，桩身位移越大，位移峰值到达的时刻越滞后。
- 非饱和土 /
- 水平振动 /
- Euler梁 /
- 瞬态响应
Abstract: Based on the dynamic governing equations of unsaturated soil, the horizontal transient response of a single pile in unsaturated soil was analyzed. By using the Laplace Transform and method of normalization, the horizontal wave equations of transform domains in unsaturated soil were established. By the method of separation variables and the operator-decomposition theory, the displacement solutions of unsaturated soil in the Laplace Transform Domain were obtained. To solve the soil-pile coupling system, the horizontal vibration equations of pile foundations and the continuity conditions were both adopted, and then the Laplace Transform's expressions of the displacement and internal forces of piles were obtained. By numerical calculation of Laplace's inverse transforms, the effects of the degrees of saturation, pile-soil modulus ratios and load duration on dynamic responses of piles were studied. The results showed that:the degrees of saturation influenced the displacement and internal forces of piles to some extents. The larger pile-soil modulus ratios, the influence of degrees of saturation on piles more significant. The longer the duration of impact loads, the greater the pile displacement, and the more the lag of the peak displacement.
- unsaturated soil /
- horizontal vibration /
- Euler beam /
- time domain

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参考文献(15)

NOGAMI T, KONAGAI K. Time Domain Axial Response of Dynamically Loaded Single Piles[J]. Eng. Mech. ASCE,1986, 112:1241-1252.

NOGAMI T, KONAGAI K. Time Domain Flexural Response of Dynamically Loaded Pile Groups[J]. Eng. Mech. ASCE,1988, 114:1512-1525.

MAMOON S M, BANERJEE P K. Time-Domain Analysis of Dynamically Loaded Single Piles[J]. Eng. Mech. ASCE, 1992, 118(1):140-160.

CHEUNG Y K, THAM L G. Transient Response of Single Piles Under Horizontal Excitations[J]. Earth. Eng. Struc. Dyn,1995, 24:1017-1038.

MAHESHWARE B K, KEVIN Z, TRUMAN M, et al. Tree-Dimensional Finite Element Nonlinear Dynamic Analysis of Pile Groups for Lateral Transient and Seismic Excitations[J]. Geotechnique, 2004, 41:118-133.

CHANG X M, LIU D J, GAO F, et al. A Study on Lateral Transient Vibration of Large Diameter Piles Considering Pile-Soil Interaction[J]. Soil Dynamics and Earthquake Engineering, 2016, 90:211-220.

KESHAVARZ A, MALEKZADEH P, HOSSEINI A. Time Domain Dynamic Analysis of Floating Piles Under Impact Loads[J]. International Journal of Geomechanics,2017, 17(2):04016051.

王宏志. 冲击荷载作用下桩的纵向和横向动力响应[D]. 杭州:浙江大学, 2001.

刘甲东, 王建国. 均匀土中有限长桩瞬态横向动力响应[J]. 工程力学, 2003, 20(6):160-165.

尚微. 饱和土中管桩水平瞬态动力特性研究[D]. 太原:太原理工大学, 2016.

刘圆圆, 王星华, 章敏, 等. 饱和土中单桩水平瞬态响应研究[J]. 岩土力学, 2013, 34(9):2699-2706.

XIAO S,WANG K H,GAO L,et al. Dynamic Characteristics of a Large-Diameter Pile in Saturated Soil and Its Application[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2018, 42(11):1255-1269.

王星华, 章敏. 非饱和土半空间中单桩竖向振动特性研究[J]. 岩土工程学报,2013, 35(7):1210-1220.

ZHANG M, SHANG W, WANG X H,et al. Lateral Dynamic Analysis of Single Pile in Partially Saturated Soil[J]. European Journal of Environmental and Civil Engineering, 2019, 23(10):1156-1177.

彭凡, 陈耀军, 刘一凡, 等. 基于Fourier级数展开的Laplace数值逆变换[J]. 力学学报, 2008, 40(2):215-220.

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