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针对碾压混凝土薄拱坝表面温度梯度受外界气温变化影响显著而易产生温度裂缝的问题,以铁川桥碾压混凝土薄拱坝为工程背景,依据实际的施工进度和碾压混凝土的热力学参数,采用自主开发的FZFX3D温控计算软件,对施工期碾压混凝土薄拱坝在表面一直裸露与永久保护两种工况下进行三维温控仿真分析,通过比较坝体在有无表面保护措施下的温度与应力变化,研究表明对于受外界气温影响显著的碾压混凝土薄拱坝,表面保护措施不仅可以明显减少气温对混凝土表层温度梯度的影响,特别是距离坝体表面2m厚范围内的影响最显著,而且对坝体最大拉应力也有明显的改善,是节约温控成本的一项可行措施,也为类似工程实施温控措施提供借鉴。
In view of the fact that the surface temperature gradient of RCC arch dam is influenced significantly by the change of ambient temperature and the temperature cracks are easy to occur, taking the Tiechuanqiao RCC single-arch dam as the engineering background, according to the actual construction schedule and the thermodynamic parameters of roller compacted concrete , The temperature control software FZFX3D developed by ourselves is used to simulate the three-dimensional temperature control of RCC arch dam under the conditions of being exposed and permanently protected. By comparing the dam with or without surface protection The results show that the surface protection measures can significantly reduce the influence of air temperature on the surface temperature gradient of concrete, especially in the range of 2m from the surface of the dam, for the RCC thin-wall dam that is significantly affected by the outside air temperature The most significant, but also the maximum tensile stress of the dam has also been significantly improved, is a feasible measure to save temperature control costs, but also provide reference for similar projects to implement temperature control measures.