特高拱坝施工期温控防裂问题的探讨  

Discussion on temperature control and crack prevention for super-high arch dams

作　　者：张国新[1] 艾永平[2] 刘有志[1] 刘毅[1] 

机构地区：[1]中国水利水电科学研究院,北京100038 [2]云南华能澜沧江水电有限公司,昆明650214

出　　处：《水力发电学报》2010年第5期125-131,共7页Journal of Hydroelectric Engineering

基　　金：水利部行业公益科研专项(200801007);国家科技支撑计划项目(2008BAB29B05);国家自然科学青年基金(50909105);中国水科院科研专项基金(材集1028)

摘　　要：本文结合特高拱坝施工期温控防裂的自身特点,从混凝土的真实抗裂能力、大坝水管冷却时的几个关键部位及关键时段,以及影响大坝温度和应力的几个关键因素等几个方面进行深入的分析和全面阐述,提出特高拱坝温控防裂所需要的考虑时、空温控效应的冷却思路与方案。最后,结合我国某特高拱坝施工期的实际温控方案,对比分析了增加中期冷却和增加过渡区后的温控效果,进一步验证了特高拱坝需要采用"个性化、精细化和信息化"温控设计理念的必要性和合理性。In this paper,in consideration of the self characteristic in temperature control and crack prevention of super-high arch dams,the real ability of concrete against cracking,several key positions and periods of dam cooling,and several key factors influencing the temperature field and stress field are extensively discussed and expatiated;pipe cooling schemes considering the influence of time and space are proposed to meet the need of temperature control and crack preventing for super-high dams.Finally,with the help of a super-high arch dam under construction,a comparison analysis for the temperature control effect is made for three schemes considering the in-situ temperature data,adding a middle cooling and a transition region.The computation results prove that the ‘individuation,elaboration,and informationization’ design method for temperature control is reasonable and necessary.

关 键 词：水工结构 温控防裂 综述 特高拱坝 水管冷却 真实抗裂能力 

分 类 号：TV31[水利工程—水工结构工程]