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.
换土垫层厚度设计是换填法地基处理设计的关键。
The design of replacement underlayer thickness is crucial to the replacement method of ground treatment.
根据建筑荷载以及实际情况进行方案比选，采用了砂垫层换填法处理地基。
Following the required loading conditions of the foundation, a sand bedding course was used for its groundsill.
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