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本文应用三维有限单元法,对东风水电站拱坝坝基深槽回填混凝土的温度场和温度徐变应力进行了仿真计算,并研究了温控防裂措施。分析表明,坝基深槽回填混凝土不论整体方案或分缝方案,在拟定的分层浇筑情况下,产生贯穿性裂缝的可能性较小,进行通仓浇筑是合理的。若采用分缝方案时,建议在混凝土中掺入MgO膨胀剂,使混凝土产生一定的膨胀量,减少温度应力并挤住浇筑分缝,勿须冷却灌浆,使深槽回填混凝土满足设计要求。所提成果可用于该工程的温度控制设计,对其它工程也有参考价值。
In this paper, the three-dimensional finite element method is used to simulate the temperature field and temperature creep stress of backfill concrete filled deep groove of the dam foundation of Dongfeng Hydropower Station, and the temperature control cracking measures are studied. The analysis shows that, regardless of the overall scheme or seam scheme, the dam foundation deep groove backfilled concrete is less likely to produce through-fractures under the proposed layered pouring conditions. If the seam scheme is adopted, it is suggested to mix MgO expansion agent into the concrete to make certain amount of expansion of the concrete, reduce the temperature stress and squeeze the pouring joints, and do not need to cool the grouting so that the deep groove backfill concrete can meet the design requirements. The results can be used for the project’s temperature control design, and other projects also have reference value.