圆柱桥墩局部冲刷机理  

Partial Scour Mechanism of Cylindrical Bridge Piers

作　　者：梁浩然 胡亮亮 袁浩 Liang Haoran;Hu Liangliang;Yuan Hao(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Shipping and Naval Architecture,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Southwest Research Institute for Water Transport Engineering,Chongqing Jiaotong University,Chongqing 400016,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学航运与船舶工程学院,重庆400074 [3]重庆交通大学重庆西南水运工程科学研究所,重庆400016

出　　处：《陕西水利》2023年第9期1-4,共4页Shaanxi Water Resources

基　　金：国家自然科学基金项目(52109076);重庆市技术创新与应用发展专项面上项目(cstc2019jscx-msxmX0107)。

摘　　要：利用水槽动床冲刷实验,获得不同流量和水深条件下圆柱型桥墩流场分布及冲刷地形。分析冲刷范围、冲刷深度、冲刷扩散角与来流流量及下游水深之间的关系。结果表明:最大冲刷深度与桥墩尺度、泥沙粒径、流场紊动能等有关;流量增大、水位变浅时由于行进流速、紊动能等因素的影响使最大冲深呈现单增趋势;最大冲宽与最大冲深的分布规律在流场和水深条件改变时相似。通过该修正公式将可以更好地预测圆柱桥墩在较大流速下的最大冲刷深度。The flow field distribution and scouring topography of cylindrical piers under diferent flow and water depth conditions were obtained by using flume dynamic bed scouring experiments.The relationships between scour extent,scour depth,scour diffusion angle,incoming flow and downstream water depth were analyzed.The results show that the maximum scour depth is related to the pier scale,sediment particle size and turbulent energy of the flow field;the maximum scour depth shows a single increasing trend when the flow rate increases and the water level becomes shallow due to the influence of the traveling flow velocity and turbulent energy;the distribution rules of maximum scour width and maximum scour depth are similar when the flow field and water depth conditions change.The maximum scour depth of cylindrical piers at higher flow velocities can be better predicted by this correction formula.

关 键 词：冲刷范围 冲刷深度 紊动能 最大冲深 冲刷扩散角 

分 类 号：U442.32[建筑科学—桥梁与隧道工程]