混凝土坝温控防裂要点的探讨

Discussion on key points of temperature control and crack prevention of concrete dam

本文提出了特高拱坝和碾压混凝土重力坝的温控要点:特高拱坝除按规范要求严格控制基础温差外,更要树立温度梯度控制的理念,按照"小温差、慢冷却、全过程保护"的要求减小上下层温差和内外温差;碾压混凝土重力坝在做好表面保护的前提下可适当放宽对基础温差的控制要求。按照信息采集与传输、信息管理、仿真分析、预警预报、自动控制等五个环节建立混凝土坝防裂智能监控系统,对混凝土坝温控施工全过程进行监控,为温控防裂施工的"可知、可控"提供技术手段,是未来施工管理的一个发展方向。

The key points of the temperature control of concrete construction for super-high arch dam and roller compacted concrete（RCC） gravity dam are put forward herein.Except the strict control of the basic temperature difference in accordance with the relevant technical specifications,the concrete construction of super-high arch dam is further required to reduce the temperature differences between upper and lower layers and between inside and outside on the basis of the principle of small temperature difference,slow cooling and whole process protection.Under the premise of doing the surface protection well,the control requirement of the basic temperature difference can be properly relaxed for the construction of RCC dam.It is a development orientation of the construction management in the days to come that an intelligent monitoring and control system is necessary to be established for the temperature control and crack prevention,that consists of the five key-links such as information collection and transmission,information management,simulation analysis,early-warning and forecasting,automatic control,etc.,for a whole process monitoring on the temperature control during the construction of both the kinds of the dams,and then provide a knowable and controllable technical means concerned as well.