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本文采用空间有限元法，就工程中常用的筏式基础在与上都结构及土介质三者共同作用时的性状进行了探讨。重点分析了筏板基础刚度变化对整个系统的影响。考虑到较厚筏基中不可忽略的横向剪切变形的影响，本文采用协调板单元-厚板单元进行分析，同时考虑到上的层状分布及非均质性而采用分层地基模型。作者用Fortran语言编写了程序，并在微机上调试通过。针对一典型算例，分析得出了一些对工程实践十分有用的结论和认识。
In this paper, space finite element method is used to discuss the traits commonly used in engineering in the joint action of the upper structure and the soil medium. The influence of the stiffness change of the raft foundation on the entire system was analyzed. Considering the influence of the non-negligible transverse shear deformation on the thicker raft foundation, this paper adopts the coordinating plate element-thick plate element for analysis, and considers the layered distribution and heterogeneity to adopt the layered foundation model. The author wrote the program in Fortran and debugged it on the PC. For a typical example, the analysis has drawn some useful conclusions and understanding of engineering practice.