丰满水电站大体积混凝土容许降温速率研究

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英文篇名：Study on allowable cooling rate of massive concrete in Fengman Hydropower Station 作者：李建华 ; 田松伟 ; 黄达海 英文作者：LI Jianhua;TIAN Songwei;HUANG Dahai;Beijing Taisite Engineering Testing Co., Ltd;School of Transportation Science and Engineering,Beihang University; 关键词：容许降温速率 ; 温度应力 ; 温控措施 ; 大体积混凝土 ; 仿真分析 ; 寒冷地区 ; 丰满水电站 英文关键词：allowed cooling rate;;thermal stress;;temperature control measures;;mass concrete;;simulation analysis;;clod area;;Fengman hydropomever station 中文刊名：人民长江 英文刊名：Yangtze River 机构：北京泰斯特工程检测有限公司;北京航空航天大学交通科学与工程学院; 出版日期：2019-08-28 出版单位：人民长江 年：2019 期：08 语种：中文; 页：155-159 页数：5 CN：42-1202/TV ISSN：1001-4179 分类号：TV544

摘要

现有大体积混凝土温控研究主要强调对内部最高温度以及温差的控制,而对降温阶段的起始时间以及容许降温速率的研究较少,导致严寒地区某些工程在完善的温控措施下仍然存在不同程度的开裂。以丰满水电站工程为例,采用容许降温速率评价大体积混凝土的开裂风险,利用有限元仿真分析软件对不同龄期混凝土的容许降温速率进行研究,分析降温速率对温度应力的影响作用,研究不同阶段的降温速率控制指标。研究结果表明,容许降温速率与混凝土相应龄期的抗力关系密切。针对丰满水电站大坝混凝土,建议早期降温速率在0.65℃～1.20℃,中期降温速率在0.40℃～0.60℃,后期降温速率要低于每天0.30℃,以降低开裂风险。
        The existing studies on temperature control of massive concrete mainly emphasize on controlling of internal peak temperature and temperature difference, but the studies on the start time of cooling stage and the cooling rate are insufficient, resulting in that several projects in severe cold region cracked in different degrees even under perfect temperature control. Taking Fengman hdyroproject as an example, the cracking risk of massive concrete is evaluated through allowable cooling rate. The allowable cooling rates of the massive concrete at different ages are studied by finite element simulation software and the effect of cooling rate on the temperature stress is analyzed. With the analysis results, the controlling indexes of cooling rate at different stages are put forward. The results show that the allowable cooling rate is closely related with the resistance capacity of concrete. For the Fengman Hydropower Project, to reduce cracking risk, it is suggested that the cooling rate at early age should be between 0.65℃～1.2℃/d, and 0.4℃～0.6℃/d in middle stage, and less than 0.3℃/d in the later stage.

引文

[1] 丁宝瑛,王国秉,黄淑萍,等.国内混凝土坝裂缝成因综述与防止措施[J].水利水电技术,1994(4):12-18.
    [2] 龚召熊.水工混凝土的温控与防裂[M].北京:中国水利水电出版社,1999.
    [3] 王成山.严寒地区碾压混凝土重力坝温度应力研究与温控防裂技术[D].大连:大连理工大学,2003.
    [4] 黄淑平,胡平.观音阁水库碾压混凝土大坝温度应力仿真计算研究[J].水力发电,1996(7):40-44.
    [5] 郭磊,陈守开.混凝土表面保温和水管冷却的温控效果研究[J].人民长江,2011,42(11):27-31.
    [6] 水利部长江水利委员会长江勘测规划设计研究院.混凝土重力坝设计规范(SL319-2005)[S].北京:中国水利水电出版社,2005.
    [7] Briffaut M,Benboudjema F,Torrenti J M,A thermal active restrained shrinkage ring test to study the early age concrete behaviour of massive structures[J].Cement and Concrete Research,2011,4(1):56-63.
    [8] 朱伯芳.小温差早冷却缓慢冷却是混凝土坝水管冷却的新方向[J].水利水电技术,2009,40(1):45-50.
    [9] 张国新,朱伯芳.“九三一”温度控制模式的研究与实践[J].水力发电学报,2014,33(2):179-184.
    [10] 秦克红.小温差、早冷却、缓慢冷却在溪洛渡拱坝施工中的应用[J].湖南水利水电,2011(4):7-9.
    [11] Shi N,Ouyang J S,Zhang R X,Experimental study on early-age crack of mass concrete under the controlled temperature history[J].Advances in Materials Science and Engineering,2014(20):1-10.
    [12] 朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国电力出版社,2003.
    [13] 贺金仁,周永健.混凝土水管冷却效果敏感性分析[J].水电能源科学,2009,27(3):94-96.
    [14] 金鑫,李鹏辉.龙华口碾压混凝土重力坝表面永久保温对施工期温度应力的影响[J].南水北调与水利科技,2010,8(5):52-57.
    [15] 金毅勐,张润潇.高寒地区强约束区大体积混凝土基础容许温差的仿真计算[J].水电能源科学,2013,31(3):103-105.
    [16] 李建华,张春生,王富强等.严寒地区大坝混凝土降温速率研究[J].水利水电技术,2015,46(12):17-22.