河床溯源冲刷影响下的桥墩冲刷

发布时间：2018-03-30 14:14

本文选题：墩柱耦合冲刷　切入点：采沙坑　出处：《水利学报》2017年07期

【摘要】：主要针对河床采沙所致的溯源冲刷对水下结构物周围冲刷影响的问题,研究冲刷演变及预测方法,为结构物安全防洪提供参考。通过水槽试验观测了床面突降条件下的溯源冲刷和墩柱局部冲刷耦合发展规律及其主要影响因素,建立了溯源与局部耦合冲刷的实时计算方法。溯源冲刷耦合下的局部冲刷与平床时的冲刷之比呈上凸曲线变化,与距离、流量及跌水水头差有关;局部冲刷和溯源冲刷对总冲刷深度的贡献比是墩柱与采沙坑距离、跌水水头差及流量的函数;在河床采沙的一定影响范围内,溯源冲刷到达时的瞬间冲刷速率远大于局部冲刷速率。本文的计算方法,可用于预测溯源与局部耦合冲刷时结构物总冲刷深度的发展。
[Abstract]:Aiming at the influence of traceability scour caused by river bed sand mining on the erosion around underwater structures, the erosion evolution and prediction methods are studied. Through flume test, the coupling development of traceability scour and partial erosion of pier column and its main influencing factors are observed by flume test. The real time calculation method of tracing and local coupling scour is established. The ratio of local scour and flat-bed scour under the coupling of traceability and local scour changes with upwardly convex curve, which is related to distance, flow rate and water head difference. The contribution ratio of local scour and traceability scour to the total scour depth is the function of the distance between pier pillar and sand pit, the difference of water head and flow rate, and the influence of sediment mining on river bed. The instantaneous scour rate of traceability is much larger than that of local scour. The calculation method in this paper can be used to predict the development of the total scour depth of the structure during the tracing and local coupled scour.
【作者单位】：北京交通大学土木建筑工程学院;结构风工程与城市风环境北京市重点实验室;
【基金】：国家自然科学基金资助项目(51578062) 中国铁路总公司科技研究开发计划资助项目(2014G009-H)
【分类号】：U442.32

【参考文献】