服役期水工混凝土主动控温系统设计研究

针对服役期水工混凝土在“早期控温、后期保温”措施下温度不可控的现状，为减小表层混凝土内外温差，预防温度裂缝的发生，提出了对服役期水工混凝土进行主动控温的方法，考虑到调控过程中涉及的温湿耦合问题，以温湿应变最小原则为衡量标准，就控温系统中的控温管道埋设深度、间距及调控温度等进行了研究。研究结果表明主动控温能够有效减小环境温度骤降带来的不利应变，同时调温管道埋设深度与间距在0.3 m左右，调控温度在最大温度降幅36.5%时，调控过程中的温湿应变最小，控温效果最佳。

Research and design of active temperature control system for hydraulic concrete in service period

Temperature of hydraulic concrete in service period is not controllable under the measures of early temperature control and later thermal insulation. To reduce the temperature gradient near a concrete surface and prevent temperature cracking, we develop a method for active control of hydraulic concrete in service period. We construct a temperature control system and examine the buried depth and spacing of its temperature control pipelines and its regulated temperature, considering temperature-humidity coupling in the regulation and applying a measure based on the principle of minimizing temperature-humidity strain. The results show active temperature control can effectively reduce the adverse strain caused by a sudden drop in ambient temperature. And the best temperature control effect and lowest temperature-humidity strain are achieved at a buried depth of 0.3 m, pipe spacing of 0.3 m, and a regulated temperature drop up to 36.5%.