成层土中半埋入完整桩的瞬态波动响应

基于回传射线矩阵法,求得单位脉冲作用下成层土中半埋人完整桩的桩顶速度导纳和相位,然后利用Fourier逆变换和卷积定理求得瞬态半正弦激振力作用下的桩顶时域速度响应.比较均匀地基、上软下硬(上硬下软)两层地基、软夹层(硬夹层)三层地基的桩顶速度响应,进一步分析土体剪切模量、上覆土层厚度、软(硬)夹层厚度对桩顶速度导纳、相位和反射波的影响.结果表明:土体剪切模量及土层厚度对桩顶速度导纳、相位以及反射波影响很大.

TRANSIENT WAVE RESPONSE OF AN INTEGRATED PILE PARTIALLY EMBEDDED IN LAYERED SOIL

Based on the method of reverberation-ray matrix, the velocity admittance responses and the phase curves of an integrated 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. The responses of an integrated pile partially embedded in either homogeneous soil, or two-layered soil or three-layered soil are calculated and compared. The influences of shear modulus, covering-soil thickness and soft (or hard) interlayer thickness on velocity admittance, phase and reflection wave of pile head are analyzed in detail. It is shown that the shear modulus and thickness of soil produce great effect on velocity admittance, phase and reflection wave.