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采用空间有限元法，就工程中常用的筏式基础在考虑上部结构及土介质三者共同作用条件下的性状进行了探讨。着重分析了筏基刚度变化对整个系统内力场和位移场的影响。筏基采用可考虑横向剪切变形影响的厚板协调单元，地基采用分层模型。运用所编程序，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。
Using the spatial finite element method, the properties of the raft foundation commonly used in engineering are considered in consideration of the joint behavior of the upper structure and the soil medium. Emphasis is placed on the influence of the change in stiffness of the sill base on the force field and displacement field in the entire system. The sill base adopts a thick plate coordinating unit that can consider the influence of transverse shear deformation, and the foundation adopts a layered model. Using the procedures compiled, a number of conclusions and understandings that are very useful for engineering practice have been obtained through analysis of a typical example.