水电站蜗壳结构局部垫层平面设置范围探讨  

Discussion of In-plane Scope of Local Cushion Layer Set in Spiral Case Structure of Hydropower Station

作　　者：孙海清[1] 伍鹤皋[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,湖北武汉430072 [2]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《四川大学学报（工程科学版）》2011年第2期39-44,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金重点资助项目(50539010);教育部优秀青年教师计划资助项目(20011879)

摘　　要：为分析水电站蜗壳结构中局部垫层的平面设置范围,采用ABAQUS软件对一水电站蜗壳结构进行了3维非线性有限元计算。研究结果表明:蜗壳结构中局部垫层平面范围分别自蜗壳直管段进口铺至下游45°、90°和135°断面时,垫层铺设范围越大,改善蜗壳外围混凝土结构受力状况的效果越显著,但垫层铺至45°断面时完全能有效限制混凝土裂缝宽度的开展和减小机墩不均匀上抬位移。此外,垫层平面范围铺至45°断面时,座环所承受剪力相比完全直埋方案增幅最小,有利于结构稳定。鉴于以上分析,且从简化施工程序角度考虑,水电站蜗壳结构中局部垫层平面范围铺至45°断面是值得推荐的。By means of software ABAQUS,a spiral case structure of hydropower station was calculated with three-dimensional finite element method so as to discuss the in-plane scope of local cushion layer set in spiral case structure.When the end of the local cushion layer starting at the straight pipe inlet changed between section 45° and section 135°,the bigger the scope was,the better to improve the load status of concrete structure around the spiral case.It was fully capable to limit the width of concrete cracks and reduce the non-uniform displacement of the rise of generator pier effectively as the local cushion layer was set to end at section 45°.Besides,when the cushion layer was set to end at section 45°,the shearing force loaded on the stay ring would increase less basing on that of the complete bearing spiral case structure.This was beneficial to the whole structure.Based on these analysis and considering the simplification of the construction procedure,the local cushion layer set in spiral case structure of hydropower station ending at section 45° was worth to be selected.

关 键 词：水工结构 水电站蜗壳 局部垫层范围 非线性有限元分析 ABAQUS软件 

分 类 号：TV731[水利工程—水利水电工程]