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本文提出了砂垫层──钢筋混凝土板复合筏基础的设计思想，给出了这种基础的三维力学模型及其相应的内力计算方法．根据微分方程的相似性，将复合筏核基础的内力分析转换为三种不同支承和受荷情况的弹性地基板的叠加，并且用有限元方法进行了具体计算．通过算例和工程实例比较了复合筏基础和传统片筏基础的受力特性和造价、结果表明。复合筏基础具有内力小和造价低等优点．具有良好的工程应用前景．
In this paper, the design idea of the sand cushion—the composite concrete raft foundation for reinforced concrete slabs is proposed. The basic three-dimensional mechanical model and its corresponding internal force calculation method are given. Based on the similarity of differential equations, the internal force analysis of the composite hafnium core was transformed into three superposition of elastic ground plates with different bearing and loading conditions, and the finite element method was used for specific calculation. The force characteristics and the cost of the composite concrete foundation and the traditional concrete foundation were compared by examples and engineering examples. The results show that. Composite ramming foundation has the advantages of small internal force and low cost. Has a good engineering application prospects.