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| Modified Rayleigh-Love rod model for 3D strain wave propagation analysis of low strain integrity test |
| ZHANG Yunpeng，WU Wenbing |
| (Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China) |
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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.
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2023, Vol. 42 
