摘要
针对大型渡槽施工期间常见裂缝问题,采用三维有限元仿真分析软件,以南水北调某大型渡槽为例,对混凝土浇筑全过程进行了模拟,分析了一期水管冷却效果,并对水管冷却的通水温度进行敏感性分析。计算结果表明,水管冷却具有良好的导热降温作用,不同的通水温度对混凝土温度降幅基本一致,在确保降温效果的同时可适当提高通水温度以降低水管附近混凝土的拉应力,同样能有效防止施工早期和后期其他部位出现温度裂缝,可供类似工程在施工期的温控措施借鉴。
For the problem of cracks in aqueduct during the period of construction,a three-dimensional finite element simulation analysis software is applied to simulate the process of casting the concrete of a large-scale aqueduct in South- North Water Diversion Project. The effect of pipe cooling and water temperature sensitivity are analyzed. The results show that the cooling pipes lower the temperature effectively, but different water temperature is not related to the temper-＂ ature drop. The water temperature may be raised appropriately to reduce the tensile stress near the pipe while lowering the temperature,and can also effectively prevent early and late cracks in other parts of the aqueduct.
出处
《水电能源科学》
北大核心
2009年第4期111-113,共3页
Water Resources and Power
基金
湖北省自然科学创新群体基金资助项目(2006ABC004)
关键词
大型渡槽
裂缝
水管冷却技术
温度梯度
温度应力
large-scale aqueduct
cracks
pipe cooling technique
temperature gradient
thermal stress
