土石坝应急溢洪道构建材料水力特性研究

Hydraulic Characteristic Study of Geo-synthetic Materials for Embankment Emergency Spillway Construction

采用土工合成材料构建应急溢洪道,可有效防止土石坝发生漫顶溃决。通过建立水槽模型,研究了三种土工合成材料的水力特性,获得了其表面水深、流速、切应力及摩阻系数等参数的变化规律,分析了土工合成材料作为应急溢洪道构建材料的受力特性。结果表明,三种土工合成材料均可用于构建应急溢洪道,其中以300g/m2土工布为最优。

Using geo-synthetic material to construct emergency spillway can prevent dam break from overtopping effectively.By the hydraulic model tests,hydraulic characteristic for three kinds of geo-synthetic material is studied.And then the change law of distribution of water depth,velocity,shear stress and friction coefficients over geo-synthetic materials along the dam slope were obtained.Finally,the mechanical characteristics of the geo-synthetic materials for constructing emergency spillway are analyzed.The results indicate that three kinds of geo-synthetic material can be used to construct emergency spillway and the geo-synthetic material of 300g/m2 is the best.