水电站蜗壳垫层平面铺设范围的确定原则  

Principle of determining plane covering range of membrane for spiral case in hydropower station

作　　者：张启灵[1,2,3] 伍鹤皋[3] 李端有[1,2] 

机构地区：[1]长江科学院,武汉430010 [2]水利部水工程安全与病害防治工程技术研究中心,武汉430010 [3]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《应用力学学报》2011年第2期194-200,217-218,共7页Chinese Journal of Applied Mechanics

基　　金：国家十一五科技支撑计划(2008BAB29B06)

摘　　要：目前工程界对如何合理确定水电站蜗壳垫层平面铺设范围尚无统一认识。本文采用三维有限元方法,从座环位移变形、座环抗剪性能、机墩结构位移变形、流道结构承受的扭转力比例四个方面讨论了垫层平面铺设范围的确定原则。研究结果表明,若蜗壳结构问题的主要矛盾是座环和机墩位移变形过大,则平面上垫层末端宜设置在蜗壳135°～180°断面之间;但从改善座环抗剪性能和流道结构受力条件的角度来讲,垫层末端宜设置在蜗壳0°～90°断面之间或270°断面之后。考虑到座环抗剪性能和流道结构受力条件可以通过局部的工程措施予以改善,因此应该优先考虑座环和机墩结构的不均匀变形问题,据此确定蜗壳垫层平面铺设范围。The engineering has not reached a consensus on how to determine a proper plane covering range of membrane for spiral case in a hydropower station up to now.Four factors including stay ring's displacement and deformation,stay ring's shear capability,generator pedestal's displacement and deformation,flow channel's torsional strength are considered to solve this problem by using three-dimensional finite element method(FEM).The result suggests that if the primary design objective of spiral case structure is to control stay ring and generator pedestal's displacement and deformation,the plane covering end of membrane is suitable to be located between 135° cross section and 180° cross section of spiral case.However,with regard to enhancing stay ring's shear capability and improving flow channel's loading condition,the plane covering end of membrane is suitable to be located between 0° cross section and 90° cross section,or after 270° cross section of spiral case.In view of the fact that the stay ring's shear capability can be enhanced and the flow channel's loading condition can be improved with some specific measures,the stay ring and generator pedestal's nonuniform deformation should take priority when determining the plane covering range of membrane for a spiral case.

关 键 词：水电站 蜗壳 垫层铺设范围 座环 机墩 流道结构 

分 类 号：TV731[水利工程—水利水电工程]