摘要
在桥梁设计中受地形地质、接线等原因影响,桥轴线有时不得不与河道斜交布置,通常情况下桥墩墩轴线与桥轴线垂直布置,受此影响,桥墩墩轴线则与水流流向形成一定夹角α。二维数值模拟研究成果表明,对同尺寸桥墩,α越大则桥墩阻水比随之增大,由此引起的桥墩墩前壅水高度及范围,桥区流速变化幅度及范围、紊流宽度等均相应增大,严重时将直接威胁桥区河道的通航与行洪安全。在桥梁设计时可采取桥墩墩轴线与桥轴线斜交,与水流流向保持一致,以尽量降低桥墩对河道的扰动。
Because of such factors as geological conditions and the way of wiring,the axis of bridge is designed to obliquely cross over the river.Generally,the axis of pier is vertical to the axis of bridge,as a result,a skew angle α is formed between the axis of pier and the flow.Study results indicate that the larger the skew angle α is,the larger the backwater,the flow rate change and the turbulent flow width are,endangering navigation and flood flowing.So the axis of the bridge pier should be designed to parallel with the flow direction.
出处
《红水河》
2011年第2期29-31,共3页
Hongshui River
关键词
斜交桥墩
阻水比
数值模拟
紊流宽度
壅水
skew bridge pier
water-blocking ratio
numerical simulation
turbulent flow width
backwater
