土坝溃决跌坎水流水动力特性数值模拟

发布时间：2018-05-21 18:28

本文选题：黏性土坝 + 漫顶　；参考：《水利水运工程学报》2017年05期

【摘要】：黏性土坝漫顶溃决涉及多学科交叉,过程极其复杂,尽管国内外大量物理模型试验成果表明其溃决多以"跌坎式"溯源冲蚀为主要特征,然而对该冲蚀发展形式下的水流-坝体微观作用机制尚不清晰。水流作为漫顶溃决的冲刷主动力,对坝体溃决发展起着主导性作用,采用RNG k-ε紊流模型和VOF自由液面捕捉技术针对黏性土坝漫顶溃决代表性水流结构——溃决跌坎水流开展了三维数值模拟研究,对跌坎水流的水流结构、流态、水力特性指标等进行了细致分析,揭示了不同工况下坝体跌坎上的剪切应力、流速分布规律,进而从水动力学的角度对坝面进行受力分析,初步推断了黏性土坝漫顶溃决过程中各级跌坎的主要合并方式为"台阶水平面刷深下切"。研究成果为进一步掌握黏性土坝漫顶溃决发展演变机理提供了理论基础。
[Abstract]:The overtopping failure of viscous earth dam involves multi-disciplinary crossing and the process is extremely complicated, although a large number of physical model test results at home and abroad show that the main characteristics of the collapse are the traceability erosion. However, the microscopic mechanism of the flow-dam under the erosion development is not clear. As the main power of overtopping collapse, water flow plays a leading role in the development of dam collapse. Using RNG k- 蔚 turbulence model and VOF free surface capture technique, a three-dimensional numerical simulation study was carried out on the representative structure of overtopping and collapsing of viscous earth dam, and the flow structure and flow pattern of the topping flow were studied. The hydraulic characteristic indexes are analyzed in detail to reveal the shear stress and velocity distribution law of the dam body under different working conditions, and then the stress on the dam surface is analyzed from the point of view of hydrodynamics. It is preliminarily inferred that the main combination mode of all levels of falling ridges in the process of overtopping and collapsing of viscous earth dams is "step horizontal brushing deep cutting". The research results provide a theoretical basis for further understanding the evolution mechanism of overtopping of viscous earth dams.
【作者单位】：南京水利科学研究院水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金委青年科学基金项目(51409173) 中央级公益性科研院所基本科研业务费专项资金(Y116009,Y114004)
【分类号】：TV135.2

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