大岗山拱坝施工期空库状态下应力仿真分析及评价

Stress simulation analysis and assessment of Dagangshan arch dam being in empty reservoir during construction period

根据大岗山拱坝的实际浇筑过程,采用三维非线性有限元仿真计算大岗山拱坝在自重、温度荷载及蓄水压力的不同组合工况下的坝体应力情况,得到坝体应力分布规律,在此基础上着重对比分析了坝踵、坝趾在不同荷载作用下的应力.计算结果表明,由于大岗山拱坝在完建时处于空库状态,受坝体体型影响,坝体重心位置略偏向上游侧,使得坝底上游侧受压而下游侧受拉,但其应力大小距蓄水后的应力水平及最大拉应力控制标准均有一定的富余度,不会对坝体及坝踵、坝趾产生不利影响.

According to the actual concreting process of Dagangshan arch dam,3Dnonlinear finite element method is adopted to calculate the stress distribution of the whole dam.During the simulation,different load conditions of its own weight,temperature load and water pressure are considered.As Dagangshan arch dam will be in no water by the time it is constructed,the stresses of the dam heel and dam toe are emphatically analyzed.The simulation results show that,centre-of-gravity of the dam body tends to upstream side because of its dam shape.And that makes the dam heel concrete to be in compression and the dam toe concrete in tension.However,its stress magnitude still exists a certain margin,compared with the one under the condition of the normal water level and its maximum tension control standards.The situation would not do harm to the dam body,dam heel and dam toe.