埋置移动荷载作用下成层饱和地基的动力响应

利用Fourier变换和传递反射矩阵法（TRM法）研究了成层饱和地基在埋置移动荷载作用下的动力响应。土体被假设为完全饱和的多孔弹性介质并且服从Biot多孔弹性波动方程，用修正粘滞阻尼模型来描述土体的粘弹性行为，采用TRM法来考虑饱和地基的成层性，利用Fourier变换和Fourier逆变换得到了埋置移动荷载作用下饱和地基动力响应积分形式解答。当饱和成层地基退化单层饱和地基时，该文解与已有解能很好的吻合。最后，通过数值计算分析了埋置荷载深度﹑荷载速度、荷载频率及软硬夹层对动力响应的影响。

DYNAMIC RESPONSE OF A LAYERED SATURATED GROUND SUBJECTED TO A BURIED MOVING LOAD

The dynamic response of a layered poroelastic ground under a buried moving load is analyzed using the Fourier transform and the transmission and reflected matrices (TRM) method. The soil is idealized as a fully saturated poroelastic medium conforming to the Biot's theory. A modified hysteretic damping model is introduced to describe the visco-elastic behavior of the soil. The layered property of the poroelastic half-plane is solved by using the TRM method. Using the Fourier and the inverse Fourier transforms, the integral form solutions for the dynamic response of a layered saturated half-plane under a buried moving load are obtained. When the layered half-plane is reduced to a homogeneous layer with rigid bedrock, the results obtained in this paper are in good agreement with other published results. The influence of the depth of load, buried load speed, load frequency, and the interlayer to the dynamic response is also analyzed by numerical calculation.