环翼式桥墩局部冲刷防护试验

基于桥墩局部冲刷原理,在传统防冲刷保护措施的基础上设计了一种能改变桥墩迎水面流态的新型环翼式桥墩,在不同流速、有无环翼式挡板以及不同的挡板位置下,试验研究了环翼式桥墩的局部防冲刷效果。研究结果表明,环翼式挡板可有效减小桥墩的局部冲刷,当桥墩上的挡板与河床的距离约为水深的1/3时,与无挡板的桥墩相比近底垂向流速最大可减小96%,最大冲坑深度可减小57.6%,环翼式桥墩防冲刷效果明显。

Experimental research on protection of ring-wing pier against local scour

Based on the principle of local scour around bridge piers,a new ringwing pier was designed on the basis of traditional protective measures.A series of experiments were performed with different flow velocities,with or without ring-wing baffle and with different baffle locations.The main purpose of this study was to investigate the anti-scour characteristics of the ring-wing bridge piers.The research results reveal that the ring-wing baffles can effectively reduce the local scour.Compared to the flow conditions without baffles,the near-bottom vertical velocities and the maximum scour depth can be reduced by 96% and 57.6% respectively when the distance between the baffles and the riverbed is about one-third of the water depth.