基于有限元法的大体积混凝土温控方案优化研究——以凤凰颈泵站改造工程为例

Optimization study of mass concrete thermal control scheme based on finite element method:a case study of the Fenghuangjing pumping stationrenovation project

为优化大体积混凝土温控方案以避免大体积混凝土因内部水化反应放热导致温度裂缝产生,以凤凰颈泵站改造工程为例,基于有限元方法使用MIDAS FEA软件通过对不同温控方案(四种冷却水管布置方案)的大体积混凝土进行温控数值模拟计算获得大体积混凝土内部的温度场、应力场,并对现场监测点实测温度变化与模拟结果进行比较,大体积混凝土内部温度先迅速上升,80 h后逐渐下降。综合对比四种温控方案最高温度及最大应力,方案二为相对最优方案。

In order to optimize the temperature control scheme of mass concrete and avoid temperature cracks caused by internal hydration reaction heat release of mass concrete structure,this paper relies on the renovation project of Fenghuangjing pumping station and uses MIDAS FEA software to carry out numerical simulation calculation of temperature control of mass concrete with different temperature control schemes(four cooling water pipe layout schemes).The temperature field and stress field inside the mass concrete are obtained.At the same time,the temperature change of the monitoring point measured in the field is compared with the simulation results.The internal temperature of mass concrete rises rapidly at first,and then decreases gradually after 80h.The maximum temperature and maximum stress of the four temperature control schemes are compared,and the comprehensive comparison scheme 2 is the best scheme.