串联环翼式桥墩间冲刷防护影响研究

Study on Protective Effect of Scouring between Tandem Ring-Wing Piers

环翼式桥墩纵向串联布置时,为深入研究桥墩局部冲刷防护问题,从减小冲坑大小和近底垂向流速的方向出发,通过制作桥墩模型,设计正交试验,研究单向水流条件下桥墩间距、下游侧桥墩防冲板的安装高程及数量对两个纵向串联桥墩中下游侧桥墩的冲刷深度的影响,并对所测结果进行极差分析和SPSS方差分析。结果表明,下游侧桥墩防冲板安装高程的显著性比两桥墩间中心间距大小和下游侧桥墩防冲板安装数量的显著性要高,且下游侧桥墩防冲板的安装数量对桥墩冲刷的影响最小,影响效果从大到小依次为下游侧桥墩防冲板的安装高程、桥墩间距、下游侧桥墩防冲板的安装数量。

Aiming at the protection of pier local scour,pier model was made up and orthogonal test was designed for reducing the punch hole and the vertical velocity near the bottom when the ring-wing piers were arranged longitudinally tandem.Under the condition of unidirectional water flow,it analyzed the influence of pier spacing,installation height and number of the baffles of the downstream pier on scour depth of the downstream pier.Range analysis and SPSS variance analysis of the test results were implemented.The results show that the significance of installation height of the baffles of the downstream pier is larger than pier spacing and installation number of the baffles of the downstream pier,and the influence of installation number of the baffles of the downstream pier on scour depth of the downstream pier is minimal;the descending order of impact is sorted as：installation height of the baffles of the downstream pier,pier spacing and installation number of the baffles of the downstream pier.