分布式光纤传感监测三峡大坝混凝土温度场试验研究

Monitoring the temperature in concrete structure of Three Gorges dam by using distributed opptical fiber sensor

以光纤分布式测温系统为手段,研究了三峡工程左厂14坝段浇筑过程中混凝土水化热的释放过程。结果表明,高程为140 56m的仓面,混凝土浇筑后3d,坝块内部上游面温度和中心点温度达到最高值,分别为34 75℃和26 85℃;坝块内部下游面温度达到最高值是混凝土浇筑后5d,为30 4℃;22～28d,坝块内部温度逐渐下降并趋于稳定。

The authors investigated the dissipation process of the concrete hydration heat during concrete pouring for No.14 dam block of the Three Gorges Project by using a distributed optical fiber temperature sensing system.The temperature was measured continuously.The findings revealed that the temperatures on the upstream face and the center of the dam block reached their peak values of 3475℃ and 2685℃ respectively in the workface at 1405m elevation 3 days after the pouring of concrete.The temperature on the downstream face reached its peak value of 304℃ in 5 days after the pouring of concrete.After 22 to 28 days the temperature in the dam block tended to be stable.