长江科学院院报 ›› 2012, Vol. 29 ›› Issue (12): 94-98.DOI: 10.3969/j.issn.1001-5485.2012.12.019

• 水工结构与材料 • 上一篇    下一篇

三峡地下电站27号机组蜗壳不同埋设方式下结构静力分析

陈 琴1a,1b,祁勇峰1a,1b,胡建华2   

  1. 1.长江科学院  a.材料与结构研究所;b. 水利部水工程安全与病害防治工程技术研究中心,武汉 430010;2.长江勘测规划设计研究有限责任公司 枢纽处,武汉 430010
  • 收稿日期:2012-01-11 修回日期:2012-04-05 出版日期:2012-12-01 发布日期:2012-12-18
  • 作者简介:陈 琴(1971-),女,湖北钟祥人,高级工程师,主要从事水工结构研究
  • 基金资助:

    中央级公益性科研院所基本科研业务费项目(CKSF2011016/CL);水利部公益性行业科研专项经费项目(20091066)

Static Force Analysis for Differently Embedded Spiral Case Structure of Turbine Unit No.27 in Three Gorges Underground Power Station

CHEN Qin1, QI Yong-feng1, HU Jian-hua2   

  1. 1.Yangtze River Scientific Research Institute,Wuhan 430010,China;2.Changjiang Institute of Survey, Planning, Design and Research, Wuhan 430010, China
  • Received:2012-01-11 Revised:2012-04-05 Online:2012-12-01 Published:2012-12-18

摘要: 三峡地下电站27号机组厂房蜗壳外围混凝土结构上下游侧及左侧与基岩相连,其变形会受到基岩的约束作用,受力情况特殊,需进行蜗壳埋设方式研究。采用三维接触非线性有限元法对27号机组段蜗壳流道及其外围混凝土结构和围岩进行分析,为蜗壳埋设方式的选择和配筋设计提供科学依据。研究表明:直埋方案拉应力最大,所需配筋也最多,不经济;垫层方案除局部区域外,拉应力普遍较小,不能充分发挥钢衬钢筋混凝土结构的联合承载作用;组合方案的应力介于直埋方案与垫层方案之间,但下机架基础相对上抬位移接近控制标准。

关键词: 三峡地下电站, 27号机组, 蜗壳埋设方式, 静力分析

Abstract: The peripheral concrete structure of the spiral case of turbine unit No.27 in the Three Gorges underground power station  connects with bedrock in the upstream, downstream and left side. Concrete deformation is constrained by the bedrock, and the force situation is unusual. In order to provide scientific basis for the selection of embedding manner of the spiral case and the reinforcement of the concrete structure, we carried out 3-D nonlinear finite element analysis on the flow channel, peripheral concrete, and surrounding bedrock of the turbine unit. Results show that the scheme of spiral case embedded directly is not economical because of  high tensile stress and high reinforcement ratio; the scheme of spiral case embedded with cushion layers has the advantage of low tensile stress but could not well perform the function of joint-bearing; whereas for the  scheme combining the above two, the tensile stress fall between those of the above two schemes, but the relative rising displacement of the lower rack base approaches to the control standard. In view of this, measures should be taken to reduce the relative rising displacement of the lower rack base to prevent from penetrating cracks.

Key words: Three Gorges underground power station, unit No.27, embedding manner of spira1 case, static force analysis

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