Abstract: With the improvement of dam construction technology, roller compacted concrete (RCC) has been widely used. Its excellent characteristics and convenient construction methods have been recognized by engineers, and its temperature control and crack prevention are getting more and more attention. To solve the problem, in this paper, a three-dimensional finite element method are applied based upon the pipe cooling and the common thermal control measures for conventional concrete dam, to study pipe cooling of Zhouning RCC dam. Simulation calculation has been conducted for different pipe layouts, cooling water temperatures, cooling durations, and cooling stages to analyze impacts by different cooling modes on dam concrete temperature and stress. The results show that proper prolongation of primary cooling, lower cooling water temperature, more cooling water pipes and increase of intermediate cooling before winter can achieve better temperature control and crack prevention effect. The method and conclusion are of significant reference value to construction of similar projects.

Key words: RCC, dam, pipe cooling, simulation calculation, temperature stress

摘要： 随着大坝施工技术的提高，碾压混凝土逐渐被广泛应用，优良的特性和便捷的施工方法得到工程建设者认可，其温控防裂也越来越被重视。针对这一问题，在常态混凝土坝的常用温控措施通水冷却技术基础上，运用三维有限单元法，研究周宁抽水蓄能碾压混凝土坝通水冷却方式，对不同水管布置形式、不同冷却水温、不同冷却时长和不同通水分期进行仿真计算，分析不同通水方式对大坝混凝土温度和应力的影响。结果表明，适当延长一期冷却、降低冷却水温、加密冷却水管、入冬前增加中期冷却，可以起到较好的温控防裂效果。该方法和结论对类似工程施工具有重要的参考意义。

关键词: 碾压混凝土大坝, 通水冷却, 仿真计算, 温度应力