移动荷载作用下饱和土地基中的波动特性分析

The analysis of wave characteristics in half space of saturated soils under the moving load

基于Biot波动方程,经过Fourier变换和逆Fourier变换后可获得波数-频率域以及时间-空间域的解析解。通过数值分析的手段研究了移动荷载作用下饱和多孔弹性地基中波的传播特性。重点就弥散曲线、多谱勒效应、波的成分和动力响应频率等几个特性进行了分析,发现饱和土地基由于比弹性地基多了一项流体介质,波动特性明显差异于弹性介质。

Based on Biot's wave equation,we obtain the analytical solution of saturated foundation in the wave number-frequency domain and time-space domain by Fourier transform and inverse Fourier transform.Then,the propagation characteristics of the wave in the saturated porous elastic foundation under the action of moving load dynamic response studied by means of method.The dispersion curve,Doppler effect,composition and are frequency characteristics are analyzed.It is found that the saturated soil foundation has a more fluid medium than elastic foundation,and the fluctuation characteristics are obviously different from an elastic medium.