台山核电站反应堆筏基混凝土考虑施工过程的温度场模拟分析

发布时间：2018-12-16 15:56

【摘要】：为准确模拟台山核电站筏基混凝土温度场,在有限元模拟分析筏基混凝土水化温度场时,同时考虑了龄期、温度和施工过程的影响。基于混凝土等效龄期和水化度概念,利用绝热温升曲线,确定了混凝土等效龄期水化度曲线。利用ABAQUS有限元软件模拟筏基温度场,通过HETVAL子程序实现由等效龄期水化度曲线确定的混凝土水化生热率,以此考虑龄期和温度对混凝土水化放热过程的双重影响。根据筏基施工方法及形状特性,采用1/2模型,并结合ABAQUS软件中的模型改变交互功能实现模拟施工过程。结果表明:采用等效龄期水化度,可模拟温度和龄期对水泥水化放热过程的双重影响;采用1/2模型和ABAQUS软件中模型交互功能,可模拟筏基混凝土温度场对称分布并受施工过程影响的特性;考虑施工过程模拟温升起始时刻、模拟最高温度及其对应时刻均与实测值吻合较好。
[Abstract]:In order to accurately simulate the concrete temperature field of raft foundation in Taishan Nuclear Power Station, the influence of age, temperature and construction process on the hydration temperature field of raft concrete was analyzed by finite element method. Based on the concept of concrete equivalent age and hydration degree, the concrete equivalent age hydration degree curve is determined by using adiabatic temperature rise curve. Using ABAQUS finite element software to simulate the temperature field of raft foundation, the hydration heat rate of concrete determined by the equivalent age hydration curve is realized by HETVAL subroutine, and the double influence of age and temperature on the hydration heat release process of concrete is considered. According to the construction method and shape characteristic of raft foundation, 1 / 2 model is adopted and the interactive function of model change in ABAQUS software is used to simulate the construction process. The results show that the double effects of temperature and age on the hydration exothermic process of cement can be simulated by using the equivalent hydration degree of age. By using the interactive function of 1 / 2 model and model in ABAQUS software, the symmetrical distribution of concrete temperature field on raft foundation can be simulated and affected by the construction process. Considering the starting time of simulated temperature rise in construction process, the simulated maximum temperature and its corresponding time are in good agreement with the measured values.
【作者单位】：哈尔滨工业大学土木工程学院;中国建筑第二工程局有限公司核电建设分公司;中国建筑股份有限公司技术中心;
【基金】：中国建筑股份有限公司资助项目(CSCEC2B-2010-K-02)
【分类号】：TU753;TU755

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