施工期堆石堰坝的渗流计算

在水利水电工程施工期,使堆石围堰或未完建的堆石坝过水,渲泄部分汛期洪水,是缩小导流工程规模、降低工程投资的一条重要途径.因此,国内外许多学者致力于堆石堰坝渗流、过水稳定、护面措施等方面的研究.本文简要介绍了施工期堆石堰坝的渗流计算原理和解析计算方法,并在试验研究的基础上,讨论了自由和淹没两种渗流状态,给出了两者的区分界限;同时,通过建立逸出坡降的经验公式,提出了较为完整的堆石堰坝渗流解析计算方法及相应的图解法,可以进行逸出坡降、逸出水深、渗流量、浸润线等项的计算.

Seepage Computation for Roc fill Weirs and Dams during Construction

During the construction of hydroelectric power projects, to reduce diversion engineering and the investment in the projects, an effective way is to discharge flood over the rockfill weirs and rockfill dams. As a result, the research of rockfill dam seepage, overflow stability, and surface protection measures is carried out by many scholars all over the world. In this paper, the principle and the method of seepage computation for rockfill weirs and dams under construction are introduced. On the basis of experiments, two states of free and submerged seepage are discussed, and their critical values are given. In addition, by means of establishing the formula of exit gradient, this paper gives a complete computational method for rockfill weirs and dams, which can be used in computation of exit gradient, exit depth, seepage flow, water surface profile, etc.