基于实测资料的龙开口碾压混凝土重力坝温度仿真分析

基于温度实测资料,采用有限单元法按照碾压混凝土坝分层浇筑的施工特点,对龙开口最高挡水坝段的全过程温度场进行仿真模拟。计算考虑了混凝土的水化反应、冷却通水、环境气温、库水位等对坝体温度的影响。仿真结果与实测温度变化过程吻合良好。仿真结果表明,浇筑过程中EL1230-1260 m高程坝体内部形成了较大片"高温区",长时间保持28~30℃;但随着与外界空气、库水热交换散热,高温范围逐渐缩小,预测运行十年后坝体温度稳定在20~22℃;另外,坝址干热河谷气候和冷却通水对坝体温度分布有着显著的影响。

Simulation of temperature field of Longkaikou RCC dam based on measured data

This paper presents a three-dimensional finite element model for simulation of the temperature field and its variation during the construction of Longkaikou RCC dam, with a full consideration of major factors: hydration heat of cement, cooling effect of water pipes, variable ambient temperature, and reservoir level. The simulation results demonstrate that the calculations of temperature are in good agreement with in-situ measurements. According to our prediction, a large zone of high temperature 28-30 ?C occurs in the dam layer between elevations EL1230-1260 m and it will gradually shrink after completion of dam construction through heat exchange with air and reservoir water; the mean temperature in the dam will be lowered asymptotically to a range of 20-22 ?C in ten years and remain there afterward. The temperature distribution patterns were found to depend much on the local dry-hot climate conditions in the valley and the effect of water cooling measures.