基于运行速度的B型喇叭互通出口匝道的安全分析

Safety analysis of exit ramp in b-type trumpet interchange based on running speed

出口环圈匝道采用常规B型喇叭事故率高,可用水滴形或卵形对出口环圈匝道线形进行优化设计。本文基于运行速度预测模型,对水滴形和卵形两种B型喇叭互通出口匝道进行了安全分析。结果表明,当匝道分流鼻通过速度大于75km/h时,卵形出口匝道安全性优于水滴形出口匝道;当匝道分流鼻通过速度不大于70km/h时,两种类型出口匝道安全性均能满足行驶需求。

Routine B-horn has high accident rate on the exit ring ramp, and water-shape and oval-shape can be used to optimize the alignment of the exit ring ramp. Based on the operational speed prediction model, the safety analysis of the exit ramp with water-shape and oval-shape in B-type trumpet interchange is carried out. When the speed of the distributing spot is more than 75 km/h, the results show that the safety of the oval-shape exit ramp is better than that of the water-shape exit ramp;when the speed of the distributing spot is less than 70 km/h, both two types of exit ramps can meet the safety demand.