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凤滩水电站空腹重力拱坝修建在U形河谷中,坝顶弧长488米,最大坝高112.5米,空腹坝段全长255.8米,空腹最大高度40.1米,使用宽度20.5米,坝顶高程为211.5米,正常高水位为205米.空腹顶拱为两心圆曲线,空腹总容积达18.4×10~3米~3. 坝基为石英砂岩,岩石致密坚硬,但存在成层的泥化夹层,并有倾向断层切割.对较浅的泥化夹层已挖除,难以挖除的用混凝土塞阻滑.地基采用水泥灌浆和化学灌浆,
Fengtan Hydropower Station, an empty gravity arch dam built in the U-shaped valley, the crest arc length of 488 meters, the maximum dam height of 112.5 meters, the length of fasting dam 255.8 meters, the maximum fasting height of 40.1 meters, the width of 20.5 meters, crest elevation 211.5 meters, the normal high water level of 205 meters .Flap top arch for the two heart-shaped curve, the total volume of 18.4 × 10-3 m fasting 3. The dam foundation is quartz sandstone, the rock is dense and hard, but there are stratified muddy intercalation, And prone to fault cutting.For the shallow muddy interlayer has been excavated, it is difficult to dig with the concrete plug blocking slippery foundation with cement grouting and chemical grouting,