一、前言天然地基抗压刚度系数C_z值是计算动力机器基础动力反应不可缺少的参数。关于C_z值与土的哪一种物理力学指标建立关系,国内外都有不同的做法,有的将C_z与土的动弹模E_d挂钩;有的将C_z与土的贯入度N建立关系。苏联1980年出版的《动力机器基础设计规范》(以下简称《动规》)是把C_z与土的变形模量E_0建立关系,在弹性半空间理 I. INTRODUCTION The Cz value of the compressive stiffness coefficient of natural ground is an indispensable parameter for calculating the basic dynamic response of a power machine. There is a difference between C_z value and which kind of physical and mechanical index of soil. There are different methods at home and abroad. Some C_z is linked to soil elastic modulus E_d; some C_z is related to soil’s penetration N. The Soviet Union published the “Basic Specification for Power Machinery” published in 1980 (hereinafter referred to as the “mobility regulations”) to establish the relationship between C_z and the deformation modulus E_0 of soil, and the elastic half-space theory