摘要
为探究低应变反射波法在实际应用中的响应特征及各因素影响机制,本文采用ABAQUS有限元软件Explicit显式动力分析模块,对桩基低应变动测过程中的应力波传播进行仿真模拟,分析接收点布置位置与桩周土特性等因素对应力波传播规律的影响及反射特征的响应。结果表明:ABAQUS/Explicit模块可有效再现桩基低应变反射曲线的特征波形;当接收点与激振点位于桩中心连线两侧且其连线夹角处于90°~180°时,反射波信号质量最优,利于缺陷识别和波形分析;桩周土弹性模量增大虽抑制反射波强度但对波速影响微弱,而阻尼系数升高不仅显著削弱反射信号,还会大幅降低脉冲波传播速度。本文成果可为低应变反射波法的测点布置、参数选择及桩-土耦合下信号检测提供借鉴与参考。
In order to explore the response characteristics and the influence mechanisms of various factors in the practical application of the low strain reflection wave method,the Explicit dynamic analysis module of the ABAQUS finite element software is adopted to simulate the stress wave propagation during low strain dynamic testing of pile foundations and to analyzes the influence of factors such as receiver placement location and characteristics of the surrounding soil on stress wave propagation patterns and the response of reflection features.The results indicate that the ABAQUS/Explicit module can effectively reproduce the characteristic waveform of the low strain reflection curve of pile foundations.When the receiver and excitation point are located on opposite sides of the line connecting the center of the pile and the angle between their connecting lines is between 90°and 180°,the quality of the reflected wave signal is optimal,which is conducive to defect identification and waveform analysis.Although an increase in the elastic modulus of the surrounding soil suppresses the strength of the reflected wave,it has a minimal impact on wave velocity,and an increase in the damping coefficient not only significantly weakens the reflected signal but also substantially reduces the propagation velocity of the pulse wave.The findings of this study can provide reference and guidance for monitoring point placement,parameter selection,and signal detection under pile-soil coupling conditions in low strain reflection wave method.
作者
余勇
YU Yong(Guangdong Tengrenda Construction Co.,Ltd.,Dongguan 523716,Guangdong,China)
出处
《工程建设》
2026年第2期53-59,共7页
Engineering Construction
关键词
桩基
低应变发射波法
弹性模量
阻尼系数
数值模拟
pile foundation
low strain reflection wave method
elastic modulus
damping coefficient
numerical simulation
