某高拱坝中期通水冷却降温影响因素敏感性分析及最优温控措施
|
摘要
为准确了解某高拱坝坝段混凝土中期通水冷却降温影响因素的敏感性及其最优温控措施,采用有限元仿真分析方法,定性定量分析了中期降温阶段冷却水通水流量、通水温度、通水时长、混凝土单层层厚对坝段混凝土日降温速率的影响程度,发现通水流量及通水温度影响最大;进而构建了混凝土日降温速率与通水流量、通水温度之间的非线性回归方程,从定量角度给出了最优温控措施;这可为同类工程中期降温阶段的温控措施提供参考依据。
In order to accurately understand the sensitivity of middle-stage water cooling influencing factors and the optimal temperature control measures of a section of high arch dam concrete,finite element simulation method was used to qualitatively and quantitatively analyze the influence degree of the middle-stage water cooling flow,water cooling temperature,water flow time,the single concrete layer thickness on the cooling rate of concrete dam.The results show that the water flow and temperature have the maximum effect.So,the nonlinear regression equation between the concrete daily falling temperature rates,water cooling flow and water temperature was established.Then the optimal temperature control measures are given from the quantitative point of view.Thus,it can provide reference for temperature control measures of similar project in middle-stage cooling.
In order to accurately understand the sensitivity of middle-stage water cooling influencing factors and the optimal temperature control measures of a section of high arch dam concrete,finite element simulation method was used to qualitatively and quantitatively analyze the influence degree of the middle-stage water cooling flow,water cooling temperature,water flow time,the single concrete layer thickness on the cooling rate of concrete dam.The results show that the water flow and temperature have the maximum effect.So,the nonlinear regression equation between the concrete daily falling temperature rates,water cooling flow and water temperature was established.Then the optimal temperature control measures are given from the quantitative point of view.Thus,it can provide reference for temperature control measures of similar project in middle-stage cooling.
引文
[1]朱伯芳.论混凝土坝的水管冷却[J].水利学报,2010,41(5):505-513.
[2]朱伯芳.小湾拱坝施工期裂缝成因的再探讨[J].水利水电技术,2015,46(4):1-5.
[3]杨萍,朱伯芳,刘毅,等.混凝土拱坝温控措施仿真敏感性分析[J].水力发电,2009,35(8):28-30.
[4]朱伯芳,吴龙坤,杨萍,等.混凝土坝后期水管带冷却的规划[J].水利水电技术,2008,39(7):27-31.
[5]钱波,宋铭明.某碾压混凝土重力坝温控方案优化研究[J].长江科学院院报,2013,30(10):87-93.
[6]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.
[7]王振红,张国新,于书萍,等.水工薄壁混凝土结构温控参数的敏感性分析[J].武汉理工大学学报:交通科学与工程版,2010,34(2):280-284.
[8]朱清泉.向家坝水电站大坝混凝土温控措施敏感性分析[D].南京:河海大学,2007.
[9]朱伯芳.大体积混凝土温度应力与温度控制(第二版)[M].北京:中国水利水电出版社,2012.
[2]朱伯芳.小湾拱坝施工期裂缝成因的再探讨[J].水利水电技术,2015,46(4):1-5.
[3]杨萍,朱伯芳,刘毅,等.混凝土拱坝温控措施仿真敏感性分析[J].水力发电,2009,35(8):28-30.
[4]朱伯芳,吴龙坤,杨萍,等.混凝土坝后期水管带冷却的规划[J].水利水电技术,2008,39(7):27-31.
[5]钱波,宋铭明.某碾压混凝土重力坝温控方案优化研究[J].长江科学院院报,2013,30(10):87-93.
[6]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.
[7]王振红,张国新,于书萍,等.水工薄壁混凝土结构温控参数的敏感性分析[J].武汉理工大学学报:交通科学与工程版,2010,34(2):280-284.
[8]朱清泉.向家坝水电站大坝混凝土温控措施敏感性分析[D].南京:河海大学,2007.
[9]朱伯芳.大体积混凝土温度应力与温度控制(第二版)[M].北京:中国水利水电出版社,2012.