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首页> 外文会议>Forth International Symposium on Roller Compacted Concrete (RCC) Dams; Nov 17-19, 2003; Madrid, Spain >Design features for Porce Ⅲ RCC dam
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Design features for Porce Ⅲ RCC dam

机译：PorceⅢRCC大坝的设计特点

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摘要

Porce Ⅲ hydroelectric development is currently under design and it includes a 146 m high RCC dam, which by the time of construction would be the fourth RCC dam built in Colombia and the second in the hydrological basin of Porce river. The dam will be located in a hot and rainy region of the northwestern part of the country. In the first part of this document, a discussion about the foundation requirements is presented. In the second part, a description of the most outstanding technical design features is given; among these features, the mix design includes moderate cementitious contents and no cooling of aggregates. Additives have been considered not only to delay the initial setting time, but also to improve strength of the RCC. Identification of setting times of RCC by ultrasonic energy devices is specified. To control cracking, transversal contraction joints have been designed every 20m. To improve permeability and strength of the RCC mass, bedding mix spread over the dam area has been specified. The design involves the most recently developed and successfully proved experiences to prevent leakage that consist of a combination of grouted enriched RCC and a PVC membrane. In the third part, some special construction procedures are presented. In order to reduce cost of the bedding mix and to improve placing rates, technical specifications allow the use of the horizontally sloped layered construction. Transportation of RCC by vacuum chutes between the mixing plant and the dam is also considered. Most of the aspects presented in this paper are based on recently developed experiences acquired during construction of the last two RCC dams built in Colombia: Porce Ⅱ and Miel Ⅰ.
机译：PorceⅢ水电开发项目目前正在设计中，其中包括146 m高的RCC大坝，到建设之时，它将是哥伦比亚建造的第四座RCC大坝，在Porce河水文盆地中建造第二座。大坝将位于该国西北部炎热多雨的地区。在本文档的第一部分中，介绍了有关基础要求的讨论。在第二部分中，给出了最杰出的技术设计功能的描述。在这些功能中，混合料设计包括适度的水泥含量，且不冷却骨料。人们已经考虑使用添加剂，不仅可以延缓初始凝固时间，而且可以提高RCC的强度。指定了通过超声波能量设备识别RCC的设置时间。为了控制开裂，每20m设计一次横向伸缩缝。为了提高RCC块的渗透性和强度，已指定了铺在坝区的层状混合料。该设计包括防止泄漏的最新开发和成功证明的经验，该经验包括灌浆的浓缩RCC和PVC膜的组合。第三部分介绍了一些特殊的施工程序。为了降低床上用品的成本并提高放置率，技术规范允许使用水平倾斜的分层结构。还考虑了在混合设备和大坝之间通过真空槽输送RCC。本文介绍的大多数方面都是基于最近在哥伦比亚建造的最后两座RCC大坝建设过程中获得的经验：PorceⅡ和MielⅠ。

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