大体积混凝土温度应力场变化分析

Analysis on Temperature Stress Field Change of Mass Concrete

大体积混凝土水泥水化放热产生的大量热量,由于边界条件的存在和限制,温度场和应力场的存在非常容易破坏混凝土,所以大体积混凝土温度场和应力场是其施工质量的关键因素。通过对大体积混凝土温度场和应力场的现场测试,基于现场实际的测量方案,建立正确的数值分析计算模型,根据大体积混凝土的现场力学性能非线性增长的特性,分析养护过程中大体积混凝土的温度应力场的分布、变化过程,通过对比现场测试和数值计算的结果分析可知:需要实时监测大体积混凝土的温度场和现场气象状况,采取合理的养护方案,保证水泥水化放热能够及时散出,为有效控制大体积混凝土灾害温度应力场的产生和温度裂缝提供理论支持,其结果可为类似的大体积混凝土工程提供借鉴参考。

As the cement hydration reaction gives off a lot of heat in casting maintenance process of mass concrete, and boundary conditions of the constraints led to the existence of temperature stress, temperature field is the core and key factor of mass concrete in the construction quality control. Based on the actual measurement system, the correct numerical calculation model is established. According to the real construction process of temperature measuring and temperature control, a more reasonable finite element analysis model is established. Through the consideration of the actual mechanics performance of concrete nonlinear characteristics growth, the process of mass concrete construction in the change of temperature is analyzed. The temperature field distribution and stress distribution situation, as well as the temperature field of mass concrete and the weather condition need real-time monitoring, and take reasonable maintenance plan in order to ensure that cement hydration heat can prompt scattered out. The numerical analysis results make a good agreement with the measured data, the results can be the reference for other similar projects.