蓄水冷击对景洪水电站碾压混凝土坝上游面温度及应力的影响

The Impact of Cold Water Strike on the Temperature and Stress of Jinghong Hydropower Station RCC Dam Upstream Face

景洪水电站碾压混凝土重力坝最大坝高11om，最大底宽70m。为保证首台机组顺利投产，进度要求2008年4月蓄水，此时天然河道来水水温较低，坝体内部混凝土温度较高，较大的温差将使上游坝面混凝土产生较大的拉应力，且增加坝体混凝土产生表面裂缝的几率。本文着重分析蓄水冷击对上游坝面的温度变化和应力状态的影响，提出采取补充冷却措施，以减小蓄水冷击对坝体的损害。

The Jinghong Hydropower Station RCC gravity Dam has a Maximum height of 110m and a maximum bottom width of 70m. To ensure that the first generating unit can be put into operation smoothly, it is necessary to store water in April 2008 according to the scheduling requirements. At that time, large Temperature difference between low River water temperature and high internal temperature of the concrete dam will create a big tensile stress and increase the probability of surface cracks generated on the dam upstream face. In this article, the impact of cold water strike on the temperature and stress state of Dam upstream face is analyzed and supplementary water cooling measures are put forward to reduce the impact of cold water strike on the dam body.