杨先健
    （机械工业部第四设计研究院 洛阳 471039）

[提要]  本文由弹性半空间的波动理论，导出天然地基动力刚度系数理论公式。求得的各向动力刚度系数之间的关系与频率及土类有关，并非固定值。理论结果与实测值甚为吻合。
[关键词]  天然地基 动力刚度 弹性半空间

According to wave theory of elastic half-space, the formula of dynamic stiffness in natural soil is given.
It is proved that the relation between dynamic stiffness coefficients along various direction is not unchanged, but related to frequency andthe kinds of soil. The theory result coincides the test data well.
Keywords: natural soil; dynamic stiffness; elastic half-space