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一、前言 大头坝是介于宽缝重力坝和轻型支墩坝之间的一种坝型,由于支墩可随受力情况不同而调整厚度,所以能充分利用混凝土的抗压强度;各支墩间留有空隙,渗水排出通畅,作用在支墩底部的扬压力较小;同时大头坝上游边坡较平缓,利用部分水重帮助坝体稳定,可节省混凝土工程量。由于大头坝具有上述优点,所以也是近代采用较为广泛的一种坝型。国内如柘溪、恒仁、新丰江等都为百米以上的大头坝,国外建造大头坝的实例也很多,其中正在兴建的巴西伊太普(Itaipu)大头坝,坝高达185m。因此,如何能合理而又快速地选择出大头坝断面形态也就成为设计中极待解决的问题。
I. INTRODUCTION Dadouba dam is a type of dam between wide-gap gravity dam and light-type dyke dam. Since the pier can adjust the thickness according to the force situation, it can make full use of the compressive strength of concrete. Each branch There is a gap between the pier and the seepage water is unobstructed, so the uplift pressure acting on the bottom of the pier is smaller. Meanwhile, the upstream slope of the dam is relatively gentle, and part of the water is used to help stabilize the dam, thereby saving the amount of concrete work. As the dam has the above advantages, it is also a more widely used in modern dam type. There are also many examples of large dams built in the country, such as Sui River, Heng Ren, and Xinfeng River, all of which have a height of over 100 meters. There are also many examples of large-sized dams built abroad, including the Itaipu Dadu Dam under construction, which is 185 meters high. Therefore, how to choose the shape of the section of Dauotou dam rationally and quickly becomes a problem to be solved in the design.