表面保护对施工期碾压混凝土薄拱坝温度与应力的影响  

Effects of the Surface Protection on the Temperature and Stress of RCC Thin Arc Dams in Construction Period

作　　者：徐庆[1] 欧阳建树[2] 

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003 [2]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《水电与新能源》2016年第7期35-39,共5页Hydropower and New Energy

摘　　要：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。The surface temperature gradient of roller compacted concrete （ RCC ） thin arc dams is significantly affected by the outside temperature , which could result in thermal cracks .Taking the Tiechuanqiao RCC thin arc dam as an example, three-dimensional thermal analyses are carried out with a self-developed code FZFX3D.Using the actual con-struction schedule and thermodynamic parameters of the dam , two different cases with or without a permanent surface protection are simulated .The results show that the surface protection could dramatically alleviate the influence of the outside air temperature on the surface temperature gradient in the concrete , especially for the 2 meters deep concrete from the surface .The maximum tensile stresses in the concrete are also decreased significantly .It shows that the surface protection is an effective and cheap thermal control measure .It could be a useful reference for similar projects .

关 键 词：碾压混凝土 薄拱坝 温度 应力 表面保护 

分 类 号：TV544.921[水利工程—水利水电工程]