水工大体积混凝土温度场模拟及光纤监测分析

Research on Temperature Field Simulation of Large Mass Hydraulic Concrete and Fiber Monitoring Technique

基于热传导理论,结合百色水利工程RCC坝温度控制及施工措施,对该坝的典型坝段温度场及温度应力影响模型进行三维数值仿真分析。坝上游与水面考虑为热传递,而坝体临空面考虑为与空气热交换,分别对坝体边界部位及坝体内部进行仿真分析,并将结果与坝体预埋光纤温度监测结果进行了对比研究。结果表明,竣工后较长时期内,坝体温度场仍呈动态变化特性,计算温度值因对边界条件模拟的简化而产生了一定误差,而计算温度值与光纤实际观测温度值亦存在一定偏差。

Based on heat transfer theory and temperature control method of RCC dam of Baise Project tridimensional numerical simulation of impottant monolith of Baise dam were completed on temperature field and stress model. Heat transport process was appeared between water and upstream dam. Downstream dam was considered as heat exchange with air. Dam＇s boundary and centre position were implemented individually simulative analysis. Temperature results from numerical computation was compared with data from fiber monitoring. It showed that temperature field of dam is on dynamic state in long period and computational temperature data is with some errors from the simplified simulation of boundary conditions. Deflections were occurred between computation data and fiber monitoring value.