二期冷却高度对混凝土温度徐变应力的影响

Effect of height of second-stage cooling on concrete thermal creep stress

混凝土拱坝二期冷却一方面是为横缝的接缝灌浆创造条件;另一方面也可以达到调整坝体应力状态的目的。大多拱坝每个坝段均不设纵缝,一期冷却散热量受到限制,所以混凝土二期冷却的工作非常重要。以某在建拱坝为依托,采用有限元方法,对不同二期冷却高度进行了对比计算,从理论上量化了冷却高度对混凝土温度徐变应力的影响。

The second-stage cooling for the construction of concrete arch dam is quite important, as it can not only prepare the condition for the grouting of the transverse joint, but can also regulate the stress status of the dam body. By taking an arch dam under construction as the study case, the comparative calculations are made on various heights of the second-stage cooling based on FEM, and then the effect of height of second-stage cooling on concrete thermal creep stress is theoretically quantified.