堤防决口封堵的水力学特性

发布时间：2018-04-15 16:53

本文选题：堤防决口 + 封堵方法　；参考：《水利水运工程学报》2017年03期

【摘要】：堤防决口抢险需以水流水力学特性为依据,封堵方法亦直接影响其封堵效率。首先对决口水流遇障碍物的洪水演进过程进行模拟,将水深计算结果与Biscarini等的试验数据进行对比,结果吻合较好,验证了数值模型的可靠性、准确性。以上饶市某一河道为例,基于FLOW-3D软件建立了堤防决口水流模拟的三维数值模型,对立堵法、平堵法封堵决口进行数值模拟,得到封堵过程中决口附近水位场和流速场分布规律。数值模拟结果显示:该堤防决口进口附近立堵法、平堵法块石前水位壅高明显,流速增大,最大水深分布在决口靠右位置,最大流速分布在决口靠左位置。根据决口附近流速分布规律,封堵时建议先对左侧决口堤脚进行裹头处理,而后可考虑采用大粒径块石单体抛投以降低流速,再采取群体抛投方式进占合龙。所用模拟方法和数值模型可为堤防抢险及制定堤防决口封堵方案提供参考。
[Abstract]:The emergency rescue of levees should be based on the hydraulic characteristics of water flow, and the plugging method also directly affects the plugging efficiency.First, the flood course of the flow in the crevasse is simulated, and the results of water depth calculation are compared with the experimental data of Biscarini et al. The results are in good agreement, and the reliability and accuracy of the numerical model are verified.Taking a river course in Shangrao city as an example, based on FLOW-3D software, a three-dimensional numerical model of embankment flow simulation is established. The distribution law of water level field and velocity field near the crevasse is obtained by numerical simulation of water level field and velocity field in the course of sealing by opposing plugging method and horizontal plugging method.The numerical simulation results show that the water level in front of the block is obviously high, the velocity of velocity increases, the maximum water depth is distributed at the right position of the crevasse, and the maximum velocity of water is distributed at the left position of the crevasse by the vertical blocking method near the entrance of the dike crevasse.According to the distribution of velocity near the crevasse, it is suggested that the foot of the left side of the breakwater should be wrapped first, and then the mass throwing should be adopted to reduce the velocity of flow, and then the mass throwing should be adopted.The simulation method and numerical model can be used as a reference for dyke rescue and design of embankment closure scheme.
【作者单位】：南昌大学建筑工程学院;中国人民武装警察部队水电第二总队;
【基金】：国家自然科学基金资助项目(51269019,51469015) 广东省水利科技创新基金资助项目(2014-08)
【分类号】：TV135;TV871

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