国内干砌块石护坡面层厚度设计规范比较

Study on layer thickness design for dam slope protection with paved rock blocks

干砌块石护坡在国内护坡、扩岸工程中大量应用,本文仅就干砌石护坡面层厚度问题讨论国内各相关规范提出的计算方法,明确计算参数的选取原则,通过砌石护坡稳定厚度计算的比较,指出各规范之间计算结果的差异,认为可以针对不同工程特点进行砌石护坡面层设计。使用各类规范给出的方法确定干砌石护坡面层的厚度,关键是确定风浪要素,得到计算时采用的波高和波长,因此合理地确定风速和吹程十分重要。本文对于如何合理确定风速、风向和吹程给出一些建议,文中同时介绍了荷兰采用的干砌石护坡面层的设计方法,相比之下,我国采用的砌石护坡面层设计厚度略偏于安全。

Paved rock blocks have been widely used in pitched dike revetment construction. The layer design is mainly based on empirical or semi-empirical estimation. This paper presents some considerations on the problems that encountered in the design of layer thickness, and introduces the structural importance and the wind wave parameters into the design procedures. Some layer calculation formulas in different design criteria and guidelines in China are compared with each other. The results are found more conservative as compared with the Netherland computing method in the design of the layer thickness for slope protection.