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为了增加机组基础的刚度、改善机组运行的稳定性，高水头抽水蓄能电站的钢蜗壳广泛采用充水预压的施工方法．其应力分析一般采用简化的计算方法，该方法忽略蜗壳内预压水头及蜗壳与外围混凝土之间的预压缝隙的影响．文中以我国已建的三座高水头抽水蓄能电站的蜗壳联合承载结构为背景，运用三线有限元法的仿真技术对其蜗壳联合承载结构的应力进行了研究，即计算应力时考虑了蜗壳内预压水头及蜗壳与外围混凝土之间预压缝隙的影响．结果表明，蜗壳联合承载结构应力分析的简化方法与用仿真方法所得到的应力分布规律是一致的，其数值上的误差在允许范围内，证明蜗壳联合承载结构应力分析的简化方法用于工程设计是可行的．
In order to increase the rigidity of the unit foundation and improve the stability of the unit operation, the construction method of water preloading is widely adopted in the steel volute of high head pumped storage power station. The stress analysis generally adopts a simplified calculation method, which ignores the influence of the pre-pressure gap between the pre-pressure head and the volute and the surrounding concrete in the volute. In this paper, based on the combined volute structure of three high-head pumped storage power stations in our country, the stress of the volute joint structure is studied by using the simulation technology of three-wire finite element method, that is, the cochlea The influence of the pre-pressure gap between the pre-pressured head and the volute and the surrounding concrete in the shell. The results show that the simplified method of stress analysis of volute combined bearing structure is consistent with the stress distribution obtained by simulation method. The numerical error is within the allowable range. The simplified method of stress analysis for volute combined bearing structure is applied to Engineering design is feasible.