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桓仁大坝上游面施工期发现严重的劈头缝20条，威胁大坝安全。
There were 20 cracks at upstream face dam head of Huanren dam during construction which threatened dam safety.
本文通过310组试验，研究了上游面倾斜的溢流坝的闸墩布置。
The pier arrangement on spillway crest with sloping upstream face is studied by 310 sets of experiments in the paper.
据推论最大可能性是在那一时间段非线性水压作用于坝体上游面所造成的差别。
It was theorized with a high degree of probability that the change in period was due to the nonlinearity of the hydrodynamic pressure acting on the upstream face of the dam.
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