高温地区大体积混凝土固化过程中温度场的模拟分析及试验验证

Numerical analysis and test verification of temperature field of mass concrete located in high temperature area

大体积混凝土温度场的数值模拟对制定施工策略至关重要,而目前针对高温地区大体积混凝土温度场的模拟方法研究较少。文章以高温地区施工的大体积混凝土方块为研究对象,采用数值模拟与原型监测相结合的方法,开展了高温地区大体积混凝土固化过程中的温度场模拟方法研究,提出了相应的数值模拟方法及关键参数的选取建议。研究表明:高温地区大体积混凝土温度场模拟时,水化热应以不同时间点水化热量的差值作为水化热生成率进行施加;降低混凝土表面的放热系数,模拟得到的混凝土最高水化热温度略有增加,但幅度不大;水泥最终水化热量取值增加,可明显提高模拟结果中混凝土的温度值,进行高温地区大体积混凝土温度场模拟时,应扩大最终水化热量取值,方可使温度模拟结果与原型观测结果统一。

The numerical simulation of temperature field of mass concrete is very important to guide the con- crete construction. However, there is little research on the simulation method for the temperature field of mass concrete located in the high temperature district. The study on the simulation method for the temperature filed of mass concrete located in the high temperature district was carried out based on numerical simulation and prototype monitoring. And the selection proposal of some key parameters was proposed. The study results prove that the hydration heat generation rate should be adopted in the finite element model with the difference value between two different time points. Reducing the concrete surface heat release coefficient will cause the highest simulation temperature of concrete increasing slightly. The increase of ultimate hydration heat value of cement can obviously raise the temperature value of the simulation. Therefore, the ultimate hydration heat value of cement should be expanded when doing the temperature field simulation of mass concrete located in high temperature area, which can make temperature simulation results close to the temperature value of prototype observation.