两河口溢洪道混凝土温控防裂方案研究

Research on Concrete Temperature Control and Crack Prevention Scheme for Lianghekou Spillway

水工建筑物溢洪道要承受高速和大流量的水冲刷,对溢洪道混凝土进行温度控制,防止裂缝产生是保证溢洪道安全运行的重中之重。以两河口溢洪道为例,结合实际工程特点,借助三维有限元和水管冷却计算方法,对不同温控方案的混凝土温度场和应力场进行了仿真计算分析,比较温控效果。优选结果表明,在适时合理的表面保温和通水方式下可以获得良好的温控防裂效果。分析结果可以指导工程施工,并为其他工程提供参考。

In order to withstand the scouring of high-speed water flow and ensure the safe operation of spillway,it is critical to carry out the temperature control of spillway concrete for cracking prevention.Taking the spillway of Lianghekou Hydropower Station as example,the temperature and stress fields of concrete with different temperature control schemes are simulated and analyzed with 3D finite element method and the water tube cooling calculation method based on actual engineering characteristics,and the temperature control effects are compared.The preferred results show that a good temperature control and anti-cracking effect could be obtained with suitable and reasonable surface thermal insulation and water-passing method in the construction of project.The study results can guide the project construction and provide references for other similar projects.