大型水电站不同埋设方式蜗壳结构分析  

Structural analysis of different embedding types of spiral case in large-scale hydropower station

作　　者：张启灵[1] 伍鹤皋[1] 黄小艳[1] 李杰[2] 赵晓峰[2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]中国水电顾问集团成都勘测设计研究院,成都610072

出　　处：《水力发电学报》2009年第3期85-90,共6页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金重点项目(50539010);教育部“优秀青年教师资助计划”项目(20011879)

摘　　要：随着水电站单机容量越来越大,蜗壳结构面临许多新的技术问题。为分析不同埋设方式对蜗壳结构的影响,本文借助ABAQUS软件,以我国第二大水电工程溪洛渡水电站为工程背景,对该电站蜗壳可能采用的三种结构型式进行了三维非线性有限元静力计算,并探讨了直埋蜗壳钢板减薄的可行性。研究结果表明,为了避免结构裂缝宽度和范围的扩展及机墩的非均匀上移,充水保压蜗壳是最优选择,但该方案存在座环相对径向变形较大的问题,直埋蜗壳钢板减薄后机墩上抬位移的增加值得重视。因此,从结构受力的角度认为三种方案都是成立的,但是蜗壳埋设方式的选择与厂房布置、工程投资、施工工艺难易程度和工程工期等因素都有直接关系,应该综合考虑。As the unit capacity of hydropower station becomes greater, the spiral case structure is faced with many new technical problems. In order to study the influence of different embedding types on the spiral case structure of Xiluodu hydropower station, the three-dimensional nonlinear finite element method FEM is used, the three different embedding types are considered, and the software ABAQUS is used to discuss the feasibility to reduce the thickness of steel lining for completely bearing spiral case. In order to avoid the concrete crack extension of width and range or the nonuniform rise of generator pedestal structure, the type of keeping constant internal pressure for spiral case is advantageous, but the relative radial deformation of stay ring is comparatively great for this type. The increasing rise of generator pedestal structure should be in focus when the thickness of steel lining for completely bearing spiral case is reduced. It is concluded that the three embedding types of spiral case are all feasible evaluated by structural requirement. However, the layout of power house, the project cost, the degree of difficulty for construction and the project duration should be all taken into consideration for selection of embedding type.

关 键 词：水工结构 埋设方式 有限元法 蜗壳结构 水电站 ABAQUS软件 

分 类 号：TV732.4[水利工程—水利水电工程]