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

Sensitivity Analysis of Middle-stage Water Cooling Factor for High Arch Dam and Optimal Control Measures

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.