复线桥的巷道效应分析

The tunnel effect analysis for double-track Bridge

针对两桥和三桥构成的复线桥,利用数学模型计算了不同桥间距和不同斜流交角情况下复线桥的水流流场,得到修建复线桥后通航净宽的减小值,提出计算净宽减小值的公式。结果表明桥洞长度及桥轴线法向与水流方向的夹角是影响巷道效应的主要因素。

For the double-track bridge consisted by two lanes and triple lanes two ways bridge,the flow field under different space of the bridge and different angle oblique flow is calculated by mathematical model,the minimum net width of the double-track bridge for navigation is gained,and formula for calculating the minimum net width is put forward.The results show that angle of the bridge net length and the flow direction is the main factors affecting the tunnel effect.