Transient wave response study of a viscous-elastic pile partially embedded in layered soil based on the method of reverberation-ray matrix

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (14) : 56-64.

YU Yun-yan，YAO Dong

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Abstract

Based on the method of reverberation-ray matrix, the velocity admittance responses curves of a viscous-elastic pile partially embedded in layered soil are derived, caused by a vertical unit impulse at the top of the pile。 The time-domain velocity responses of the pile, subjected to a semi-sine impulse at the top, are obtained through the inverse Fourier transform and the convolution theorem。 It is compared that the velocity response of pile top about embedded partially in homogeneous soil is produced by pile damping and damping surrounding the pile。 The influences of soft(or hard) interlayer thickness, interlayer soil parameters and soil parameters of pile end on velocity admittance and reflection wave of pile top are analyzed in detail。 The results show that: the pile damping make velocity admittance and reflecting signals of pile top attenuate, and pile damping causes the dispersion phenomenon of reflecting wave at the bottom of pile。 The low frequency curves of velocity admittance generate offset, because the soil stiffness of surrounding the pile and pile end have a change。 But the damping changes of surrounding the pile and pile end have a bigger effect on velocity admittance and reflecting wave of pile top than the soil stiffness changes of surrounding the pile and pile end。

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reverberation-ray matrix method / layered soil / viscous-elastic pile embedded partially in soil / transient wave / velocity admittance

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YU Yun-yan，YAO Dong. Transient wave response study of a viscous-elastic pile partially embedded in layered soil based on the method of reverberation-ray matrix[J]. Journal of Vibration and Shock, 2015, 34(14): 56-64

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