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首页> 外文会议>New Progress on Roller Compacted Concrete Dams >A New Model for the Behaviour of Roller Compacted Concrete in Dams under Early Thermal Loading
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A New Model for the Behaviour of Roller Compacted Concrete in Dams under Early Thermal Loading

机译：早期热荷载作用下大坝碾压混凝土性能的新模型

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摘要

The management of hydration heat has always been a significant issue in the engineering of large concrete dams. While a lower cementitious materials content in the case of Roller Compacted Concrete has resulted in reduced total heat development, the rapidity of the construction method implies that more of the heat generated is trapped within the body of the dam structure. In the case of the large dams now commonly being constructed in RCC, without artificial cooling, the hydration heat can require a period of several decades to be fully dissipated. When giving consideration to the design impacts of hydration heat development and dissipation in large gravity dams and arch dams, it is particularly important to understand the related behaviour of RCC as a material. While RCC has to date generally been treated as conventional mass concrete in respect of the effects of early thermal loading, instrumentation evidence from the Wolwedans and Knellpoort Dams in South Africa and Cine Dam in Turkey has demonstrated that RCC actually behaves quite differently. To develop realistic designs for large RCC gravity dams and for RCC arch dams, a meaningful understanding of the implications of the apparent early behaviour of RCC must accordingly be developed. In this paper, the authors compare the measured behaviour of Wolwedans Dam with a range of predictions through thermal- structural Finite Element analysis, applying a range of materials models. The implications of the behaviour characteristics and models proposed on the design and analysis of large RCC gravity dams and particularly arch dams are also discussed.
机译：水合热的管理一直是大型混凝土大坝工程中的重要问题。尽管在碾压混凝土的情况下，较低的胶凝材料含量导致总热量减少，但施工方法的迅速性意味着所产生的更多热量被截留在坝体内部。对于现在通常在RCC中建造的大坝而没有人工冷却的情况，水化热可能需要几十年的时间才能完全消散。在考虑大型重力坝和拱坝中水化热量产生和散发的设计影响时，了解RCC作为材料的相关行为尤为重要。迄今为止，就早期热负荷的影响而言，RCC通常被视为常规的大体积混凝土，但南非的Wolwedans和Knellpoort大坝以及土耳其的Cine Dam的仪器证据表明，RCC的行为实际上有很大不同。为了为大型RCC重力坝和RCC拱坝开发现实的设计，必须对RCC的明显早期行为的含义进行有意义的理解。在本文中，作者通过应用一系列材料模型，通过热结构有限元分析，将Wolwedans大坝的实测行为与一系列预测进行了比较。还讨论了行为特征和模型对大型RCC重力坝，尤其是拱坝的设计和分析的影响。

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