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机墩组合结构和座环结构为水轮发电机组主要的支撑体系,其刚度对机组的稳定性尤为重要。为掌握垫层蜗壳结构中软垫层对机墩及座环刚度的影响,以某巨型水电站工程为例,建立了其地下厂房结构三维有限元模型,分析了不同的垫层模拟方式即单元形式、铺设范围和压缩模量对机墩及座环刚度的影响。计算结果表明,各垫层模拟方式的变化对机墩水平刚度基本无影响;垫层铺设范围的变化对机墩竖向刚度和座环径向刚度基本无影响;垫层压缩模量的变化对机墩竖向刚度和座环径向刚度有一定影响,但影响较小,变幅最大不超过7.5%。
The structure of machine piers and the seat ring structure are the main support systems of hydro-generator sets, and its stiffness is particularly important for the stability of the generator sets. In order to grasp the influence of cushion layer on the stiffness of machine piers and seat rings in cushion volute structure, a three-dimensional finite element model of underground powerhouse structure was established by taking a giant hydropower project as an example. Different cushion simulation methods, , Laying range and compressive modulus of the machine pier and seat ring stiffness. The calculation results show that the change of the simulation mode of the cushion has little effect on the horizontal stiffness of the pier. The variation of the laying range of the cushion has almost no effect on the vertical stiffness of the pier and the radial stiffness of the seat ring. The vertical stiffness of the pier and the seat ring radial stiffness have a certain impact, but the impact is small, the maximum amplitude of not more than 7.5%.