永宁混凝土重力坝最佳开工时间研究

Study on Best Commencement Date of Yongning Concrete Gravity Dam

以最大拉应力为判据,提出了一种确定大体积混凝土结构最佳开工时间的方法。该方法通过对不同开工时间下的施工方案进行仿真计算,得出每种情况下的最大拉应力。最大拉应力最小的方案就是最佳开工时间所确定的施工进度方案。应用该方法确定了永宁混凝土重力坝的挡水坝段最佳开工时间,分析了不同开工方案的重力坝最大拉应力变化规律。

Judging from the maximum tensile stress, a method for determining the best commencement date of mass concrete structure is provided, by which the maximum tensile stress in each case is obtained through simulating the construction schedules on different commencement dates. Namely, the best commencement date corresponds to the smallest value of maximum tensile stress. In this paper, the best date for commencement of the water retaining dam of the project is determined by the said method, and the behaviors of maximum tensile stress under different construction schedules are analyzed as well.