堆石坝临时断面度汛下游护坡非均匀石料的稳定性分析

Stability analysis of inhomogeneous rubbles paved on downstream slope of temporary section of rockfill dam during flood overflowing

该文针对堆石坝临时断面度汛下游护坡非均匀石料的稳定性,系统分析了关键失稳因素,考虑了粗、细石料间的相对暴露、隐蔽效应,建立了基于最不利工况下坡面溢流与坝内渗流的水力耦合模型。通过水槽模型试验拟定了护坡石料的特征粒径表达式,阐明了护坡石料在过水条件下的失稳机理,给出了护坡石料失稳判别式,并结合滩坑面板堆石坝临时断面过水度汛实例验证了模型的有效性,为堆石坝下游护坡结构设计提供了理论依据。

Contraposing the stability of inhomogeneous rubbles paved on the downstream revetment of the temporary section of rock-fill dam in flood overflow season, this paper establishes a hydraulic coupling model considering both the surface overflow and the dam seepage based on the worst condition after a systematic analysis of pivotal instability factors and that relative exposure effect and relative concealed effect between the coarse and fine rubbles. The expression of the distinctive particle size of revetment rubbles is protocolled through the flume model experiment. The paper clarifies the instability mechanism of rubbles under the condition of flood overflow season and deduces the instability discriminant of revetment rubbles. The model are verified effective through the instance of the flood overflow controlling of the tankeng concrete face rock-fill dam project, and this research has provided a theoretical basis for the design of downstream revetment structure of rock-fill dam.