基于光纤测温的大体积混凝土导温系数反演分析

An Inverse Analysis of Thermal Diffusivity of Mass Concrete Based on Fiber Temperature Monitoring

光纤测温是利用分布式光纤对混凝土内部温度进行高密度(时间上、空间上)、无污染(人为的、干扰的)的全自动化监测过程。为了反演出混凝土的导温系数,在某建设中的特高拱坝河床坝段典型浇筑仓,距离表面0.6m范围内,布置分布式光纤进行混凝土温度监测。由于浇筑仓混凝土的施工质量存在一定随机性,根据埋设在距离混凝土表面不同深度处的分布式光纤,对各深度处光纤测温数据取平均值后进行反演。实践表明,采用分布式光纤测温所反演的导温系数是可行和可靠的。

Fiber distributed temperature monitoring is realized by carrying on high density （temporal and spatial） and pollution-free （factitious and interfered） monitoring automatically on the temperature of inner concrete. In order to determine the thermal diffusivi- ty of mass concrete, based on the record of distributed fiber buried in the O. 6 meter distance from the surface of concrete of a certain ultra-high building dam. Due to the randomicity of construction quality in the concrete, this paper adopts the average value of distrib- uted fiber＇s temperature at the different distance from the surface of concrete. The result shows that thermal diffusivity based on the record of fiber distributed is feasible and reliable.