Then straightening upper body up, setting heel plane, lifting leg point.
然后直起上身, 放平脚跟, 抬起腿尖.
The smaller the angle of the weak plane, and the larger the water level are, the closer the location of the critical point is to the plumb line through the dam heel, and vice versa.
反倾结构面的倾角愈小、上下游水位差愈大,剪应力临界点的位置愈靠近坝踵铅垂线;
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