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重力拱壩是一類大壩。在水平面為拱壩,向上游迎水面凸出,把水壓通過壩體承壓傳導給左右壩肩基岩。[1]重力拱壩比重力壩更薄。[2]壩體承受的荷載大部分借懸臂梁的作用傳給壩基;小部分借拱的作用傳給兩岸。[3]拱的作用較小,故壩底厚度一般為壩高的35%~60%。[4][5][6]
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