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一、大头壩分期蓄水施工应力问题 (一)问题的提出较高的大头壩(和重力壩)施工期需2—5年之久,在我国目前水利建设大跃进的形势下,水库的拦洪和发电都非常迫切,因此,要求在壩体断面未全部浇捣完毕即开始蓄水,如图(1—1),在最不利的情况下——纵缝(平行于壩轴线的分缝)完全不传力,或下游壩块在初期蓄水时尚未浇筑,由于初期自重应力和按整体计算的结果不同,并初期水压力产生的剪力及弯矩,仅第一期断面来承受,这可能使得上游壩面产生较
First, the dam construction of staged water storage stress problems (a) raised the problem of taller dam (and gravity dam) construction period of 2 to 5 years, at present our country water conservancy construction great leap forward situation, the reservoir block Flooding and power generation are all very urgent. Therefore, it is required to start water storage when all the dam sections have not been fully dumped, as shown in Figure 1-1. In the most unfavorable situation, longitudinal joints (parallel to the axis of the dam ) Is not force at all, or the downstream dam in the initial impoundment has not yet poured, due to the initial self-weight stress and calculated according to the overall results are different, and the initial water pressure shear and bending moment, only the first section to bear, This may make the upstream dam surface more