一、前言过去的土动力学大都是对于动力机器基础的隔振、防振等问题进行研究的。在该情况中,动荷载的特点是中频(约几十赫芝量级)、振幅较小,荷载比较规则,因而用质量阻尼弹性体系或一般的弹性半空间理论进行分析即可解决问题。近十多年来,随着抗震研究的发展,在世界上的一些高地震区域兴建了或正在兴建着许多大型土坝和堆石坝以及核电站。因此, I. INTRODUCTION In the past, most of the soil dynamics studied the vibration isolation and anti-vibration problems of the foundation of power machines. In this case, the dynamic load is characterized by an intermediate frequency (approximately dozens of Hertz scales), a small amplitude, and a relatively regular load. Therefore, the problem can be solved by analyzing the mass damping elastic system or general elastic half-space theory. In the past decade or so, with the development of seismic research, many large earth dams and rockfill dams and nuclear power plants have been constructed or are being constructed in some of the world’s high earthquake regions. therefore,