基于修正Rayleigh-Love杆件模型的桩基低应变测试中应变波三维传播分析

doi:10.13722/j.cnki.jrme.2022.0620

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摘要切向、径向高频横波干扰和横向惯性效应是影响桩基低应变检测信号识别难度的3大关键因素，目前尚无具备分析三者耦合效应的解析模型。通过对经典Rayleigh-Love杆件理论的修正，建立能考虑三维横波效应和桩基横向惯性效应的修正Rayleigh-love杆件模型，实现桩–土完整体系的应变波三维传播模拟，并通过拉普拉斯变换、分离变量、傅里叶逆变换等方法推导模型的解析解。以此理论模型为基础，对高频横波干扰和反射波震荡的成因进行探讨，并对主流的高频干扰消除方法进行对比，得到的主要结论有：(1) 随着桩径的增加，高频干扰的主要成分由切向横波转化为径向横波；(2) 桩半径在0.2～1.0 m范围的桩基础受到高频横波干扰的影响最大；(3) 将信号接收点与激振位置垂直布置或使用信号叠加法都能较好地揭示反射信号位置，但信号叠加法对高频横波干扰的消除效果更好。

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	张云鹏
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关键词 ：桩基础, 低应变测试, 真三维应变波传播, 横向惯性效应, 高频横波干扰

Abstract：High-frequency radial and circumferential transverse wave interferences，and transverse inertia effect are the three key factors influencing the readability of the low strain integrity test signal. So far，the analytical solution capable of reflecting the coupling effect of these three factors has not yet been found. Modified Rayleigh-Love rod model is proposed to realize the true 3D strain wave propagation simulation across the pile-soil system. The corresponding analytical solution is derived through Laplace transform，variable separation，and inverse Fourier transform. Based on the proposed model，the formation mechanism of the high-frequency transverse wave interference and the oscillations after the reflected signals are revealed. Meanwhile，some mainstream high-frequency interference elimination methods are compared. The main conclusions can be summarized as：(1) With the increase of the pile radius，the main components of the interference transfers from the circumferential transverse wave to the radial transverse wave；(2) The pile whose radius lies between 0.2–1.0 m is more vulnerable to high-frequency interferences；(3) Arranging the signal receiving point perpendicular to the excitation position or using the signal superposition method can both better reveal the reflected signal，but the signal superposition method has a better performance on eliminating the high-frequency interferences.

Key words： pile foundation low strain integrity test true 3D strain wave propagation transverse inertia effect high-frequency transverse wave effect

引用本文:

张云鹏，吴文兵. 基于修正Rayleigh-Love杆件模型的桩基低应变测试中应变波三维传播分析[J]. 岩石力学与工程学报, 2023, 42(S2): 4310-4319.
ZHANG Yunpeng，WU Wenbing. Modified Rayleigh-Love rod model for 3D strain wave propagation analysis of low strain integrity test. , 2023, 42(S2): 4310-4319.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0620 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/4310

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