特高拱坝温控曲线合理性改进与复核  

Improvement and review of rationality of temperature control curves for super-high arch dams

作　　者：吴建明 李庆斌[2] 谭尧升 刘春风 裴磊 王亚军 胡昱[2] WU Jianming;LI Qingbin;TAN Yaosheng;LIU Chunfeng;PEI Lei;WANG Yajun;HU Yu(Zhejiang Ocean University,Zhoushan,Zhejiang 316022;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084;China Three Gorges Projects Development Co.,Ltd,Chengdu 610041)

机构地区：[1]浙江海洋大学,浙江舟山316022 [2]清华大学水沙科学与水利水电国家重点实验室,北京100084 [3]中国三峡建设管理有限公司,成都610041

出　　处：《水力发电学报》2021年第6期160-168,共9页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(51839007);中国长江三峡集团公司科研项目(BHT/0809)。

摘　　要：随着智能温控技术提升,特高拱坝浇筑中的“三期九阶段”温控模式也可简化,使其更好改善混凝土内部应力。结合施工监测数据,本文提出“一期三阶段”和“二期六阶段”两种更简化的温控模式。通过数值模拟,控制冷却的各阶段,以拱坝内部应力变化过程来分析各曲线优劣。结果表明:“一期三阶段”温控模式在最短时间内使混凝土从最高温度降到封拱温度造成的应力影响最小;三种模式中,“一期三阶段”最大拉应力值远低于另外两种模式;三种曲线在120天、150天、180天达到封拱温度时,混凝土内部应力均远低于安全曲线,仅延长通水时长,对坝体应力影响不大;对于“三期九阶段”温控模式,减小坝体应力的关键在于合理调整降温速率和降温与控温时长的比例。As the intelligent temperature control technology improves,the temperature control model of three phases and nine stages for casting super-high arch dam concrete will be simplified,so that it can further improve the internal stresses of concrete.With consideration of the construction monitoring data,this paper suggests and examines two new simplified temperature control models:one phase and three stages and two phases and six stages;and presents an analysis,through numerical simulations using these models,of the strengths and weaknesses of different time variations in the internal stress of the arch dam under cooling control at each stage.The results show that of the three models,one phase and three stages has the weakest stress impact when the concrete is cooled down from the highest to arch sealing temperature in the shortest time;its maximum stress is much lower than those of the other two models.All the three stress curves are well below the safety threshold curve when arch sealing temperature is reached at 120,150 and 180 days,and they only extend the duration of water circulation and have little effect on dam stress.For the three phases and nine stages model,the key to reducing stress in the dam body is to reasonably adjust the cooling rate and the ratio of cooling time to temperature control time.

关 键 词：特高拱坝 混凝土冷却 温降曲线 混凝土应力 

分 类 号：TV642.4[水利工程—水利水电工程]