砂砾石垫层是换填垫层法的一种，由于其比较经济，因此在实际工程中的应用比较广泛。

Sand gravel cushion is a kind of ground cushion treatment, it is widely applied because of its low cost.

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研究结果表明，考虑地基土、砂砾石垫层、上部结构共同作用时，结构的基本频率明显减小，相应的基本周期明显延长；

The results shows that the fundamental frequency of the model which takes the combined activate into consideration reduced evidently, and the fundamental period prolonged evidently.

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