偏心激振下大直径桩中弯曲波传播特征-学报杂志社

期刊信息

合肥工业大学（自然科学版），2026年1月，第49卷第1期：94-101

DOI: 10.3969/j.issn.1003-5060.2026.01.014

作者信息

李子卓 ¹，卢志堂 ¹，马海春 ¹，阳栋 ²

(1. 合肥工业大学资源与环境工程学院，安徽合肥 230009；2. 中国建筑第五工程局有限公司，湖南长沙 410004)

摘要和关键词

摘要: 文章基于有限差分法对大直径桩中弯曲波传播特征开展了数值研究。在试验验证数值模型的基础上,分别采用截断三正弦脉冲和升余弦脉冲进行激振,研究偏心激振下桩中弯曲波的传播特性,并对模拟结果进行离散傅里叶变换,在频域内分析桩周土对弯曲波传播的衰减作用。结果表明:在偏心激振下,桩周土刚度越大,弯曲波的衰减越强烈;在同一土层中,桩中弯曲波衰减程度大于纵波,并且随着频率增高或桩径变小,弯曲波衰减变弱;缩径会引起弯曲波的反射,但其反射波的波形杂乱;缩径程度越大,缩径处反射弯曲波的幅值越大;利用桩顶采集到的弯曲波信号具有识别缺陷位置和缺陷程度的潜力。

关键词: 低应变检测；弯曲波；反射；桩身完整性；模型试验

Authors

LI Zizhuo ¹, LU Zhitang ¹, MA Haichun ¹, YANG Dong ²

(1. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; 2. China Construction Fifth Engineering Division Corp., Ltd., Changsha 410004, China)

Abstract and Keywords

Abstract: The propagation characteristics of flexural wave in large diameter piles are numerically studied using the finite difference method. On the basis of test validation, truncated three-sinusoidal pulse and raised cosine pulse are used to study the propagation characteristics of flexural wave in piles under eccentric excitation, and the attenuation effect of the soil around piles on flexural wave propagation is analyzed in the frequency domain using discrete Fourier transform. The results show that the greater the stiffness of the soil around piles, the stronger the attenuation of flexural wave under eccentric excitation. For piles buried in the same soil layer, the attenuation degree of flexural wave is greater than that of longitudinal wave, and as the frequency increases or the pile diameter becomes smaller, the attenuation of flexural wave weakens. The necking will cause the reflection of flexural wave, but the waveform of the reflected wave is irregular. The larger the necking degree, the larger the amplitude of the reflected flexural wave at the necking. The flexural wave signal collected at the pile top has the potential to identify the location and degree of defects.

Keywords: low strain test; flexural wave; reflection; pile integrity; model test

基金信息

国家自然科学基金青年科学基金资助项目（41807266）；湖南省自然科学基金资助项目（2023JJ70027）和合肥工业大学学术新人提升计划B资助项目（JZ2022HGTB0277）

合肥工业大学学报(自然科学版)

导航菜单

偏心激振下大直径桩中弯曲波传播特征