人民黃河
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高混凝土壩蝸殼及軟墊層互饋機理探究
 姚遠
(中國電建集團 中南勘測設計研究院有限公司,湖南 長沙 410014)
Analysis of MutualFeed Mechanism of Volute and Cushion in High Concrete Dam
 YAO Yuan
(Zhongnan Engineering Corporation Limited, Power China, Changsha 410014, China)

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人民黃河
  2019,Vol. 41(9): 155
  工程建設管理
高混凝土壩蝸殼及軟墊層互饋機理探究
 姚遠
(中國電建集團 中南勘測設計研究院有限公司,湖南 長沙 410014))
doi:
Analysis of MutualFeed Mechanism of Volute and Cushion in High Concrete Dam
 YAO Yuan
(Zhongnan Engineering Corporation Limited, Power China, Changsha 410014, China)
全文: PDF (6.91MB)
摘要: 墊層作為蝸殼與混凝土之間的傳力部分,其材料特性和尺寸對發電機組的穩定運行起著重要作用。為探究墊層蝸殼組合埋入方式對結構特性的影響范圍及程度,分析比較了不同墊層材料的物理特性,對軟墊層物理尺寸進行了特性分析,在對高壓聚乙烯閉孔泡沫板軟墊層特性進行詳細分析的基礎上,對蝸殼與墊層之間的摩擦系數、墊層平面鋪設范圍進行了研究,最后確定了合適的混凝土重力壩蝸殼墊層。同時詳細闡述了蝸殼有限元模型的建立過程,通過選取不同的墊層彈性模量,對正常工況、半數磁極短路、短路三種組合甩負荷工況下的蝸殼進行三維有限元計算,進而分析了蝸殼外混凝土的應力分布規律。結果表明墊層彈性模量對蝸殼外混凝土的應力分布影響顯著,彈性模量越大外圍混凝土越容易出現應力集中,并導致局部裂縫的出現,而采用軟墊層則可以很好地避免此問題。
關鍵詞:
Abstract: The cushion layer acts as a force transmission part between the volute and the concrete, and its material properties and dimensions play an important role in the stable operation of the generator set. In order to explore the influence range and influence degree of the structural characteristics of the buried volute combination, this paper analyzed and compared the physical properties of different cushion materials and analyzed the physical dimensions of the cushion layer. Based on the detailed analysis of the characteristics of the highpressure polyethylene closedcell foam board (PE) cushion layer, the friction coefficient between the volute and the cushion and the plane laying range of the cushion were studied. Finally, a suitable concrete gravity dam volute cushion was determined. At the same time, the establishment process of the finite element model of the volute was expounded in detail. By selecting different cushion elastic modulus, the threedimensional finite element calculation of the volute under three conditions of normal working conditions, half magnetic pole short circuit and short circuit was carried out. Furthermore, the stress distribution law of concrete outside the volute was analyzed.
Key words: high concrete dam; volute; cushion material; finite element analysis
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作者簡介: 姚遠(1986—),男,河南濟源人,工程師,主要從事水電站廠房結構、地下超大洞室開挖支護等方面的研究工作
江苏7位数开奖历史