中文摘要：

结合我国水电站蜗壳结构的发展近况,介绍了近几年来保压蜗壳结构的工程应用和研究进展.指出了＂带缝工作＂时不完整约束对蜗壳结构的受力特性和传振机理带来较大影响,尤其是考虑非均匀、局部非张开的保压缝隙时,对钢衬和外围混凝土之间的振动传递影响显著.在此基础上归纳了保压蜗壳结构研究中存在的问题,最终提出未来保压蜗壳结构研究应强调＂缝隙＂,视缝隙为＂控制工具＂,以全新的视角看待不完整约束条件的作用,建立一套评价不完整约束蜗壳结构安全性和稳定性的分析方法体系.

英文摘要：

The development in research and application of spiral case structure with a constant internal pressure in hydropower project is summarized. It is pointed out that the nonholonomic constraint plays an important role in contact characteristics and vibration mechanism when spiral case structure is working with ＂preload gap＂, espe- cially for the vibration transmitting between the spiral case and concrete when considering non - uniform gap. The existing problems of preloading spiral structure are then summarized. Finally, it is suggested that the concept of control should be the focus in research of pre-load spiral case structure, and ＂preload gap＂ could be regarded as a controlling measure. The role of nonholonomic constraint should be understood in order to establish a set of analy- sis method for the security and stability of nonholonomic constraint spiral case.