为研究蜗壳和外围混凝土联合受力情况下座环的结构特性,结合一实际工程垫层蜗壳结构,采用三维有限元方法,从座环应力、位移和变形以及抗剪性能几个方面分析座环结构的受力特性.结果表明:相比于座环结构强度,其位移和变形更值得重视,垫层变形模量和摩擦系数的大小应该成为座环结构分析的重要考虑因素;座环承受较大的剪力,垫层蜗壳结构设计中不能忽视此问题. In order to study the structural characteristics of the seat ring under the combined stress of the volute and the surrounding concrete, a three-dimensional finite element method is used in combination with the volute structure of an actual engineering cushion to analyze the stress, displacement and deformation and the shear resistance of the seat ring The results show that the displacement and deformation are more important than the strength of the seat ring. The deformation modulus and friction coefficient of the cushion should become the important consideration in the analysis of seat ring structure. To withstand greater shear, the spiral case design cushion can not ignore this problem.