DTS在三峡工程混凝土温度场监测中的应用

以DTS实测三峡工程大体积混凝土温度,分析了混凝土温度场水化热阶段、二峰阶段、平稳阶段的特点,指出水化热是大体积混凝土温度应力产生的重要因素;由于内部集热,混凝土浇筑1个多月后会出现第二次温度峰值;大体积混凝土经过一个季度的温度变化过程后逐渐趋向平稳,环境温度对平稳阶段混凝土表层温度有一定的影响.DTS测温成果较好地证实了三峡工程大体积混凝土温度场变化的阶段性和规律性.

Application of DTS to monitoring of concrete temperature field in Three-Gorges Project

Based on the temperature data of mass concrete in the Three-Gorges Project measured with the Distributed optical fiber Temperature monitoring System (DTS), an analysis was made of the characteristics of the three-stage temperature variation of mass concrete during the pouring process, including the hydration heat stage, the second peak stage and the stable stage. Some conclusions were summarized as follows: hydration heat is an important factor leading to concrete stresses; after a month of concrete pouring, the second temperature peak will occur suddenly due to the inner heat concentration; the temperature of mass concrete tends to become stable a quarter later, and the environmental temperature is of certain influence on the surface temperature of concrete at the stable stage. The measured data of temperature with DTS confirms the stage variation of temperature field and its regularity of mass concrete in the Three-Gorges Project.