高等级公路桥头跳车对行车安全的影响评价

Evaluating Impact of Vehicle Bumping at Bridge-head on Driving Safety

为定量研究高等级公路桥头跳车与行车安全的关系,通过对设置搭板和未设搭板2种情况下桥头跳车形成机理的分析,建立桥头不均匀沉降量、搭板长度、台阶高度与减速度之间的关系模型。以减速度为依据将桥头跳车对行车安全的影响分为3个等级。研究表明:设置搭板情况下桥头跳车对行车安全的影响不明显;未设搭板情况下桥头跳车对行车安全的影响与台阶高度和行车速度紧密相关,相同台阶高度下随着行车速度的提高,桥头跳车对行车安全的影响不断加大。速度为100km/h时,台阶高度超过1.97cm就会对行车安全产生明显影响,超过4.52cm时会产生严重影响,必须采取限速、增设搭板等措施。

The objective of this paper is to quantitatively study the relationship between Vehicle Bumping at BridgeHead(VBBH) and driving safety.Relationship models are developed to study the relationship between bridgehead differential settlement,length of approach slab,step height and deceleration.The impact of VBBH on driving safety is divided into three levels based on the deceleration.The results of this research show that VBBH has no significant effect on driving safety when approach slab is set.However,without the approach slab,the effect of VBBH on driving safety is closely related to the step height and driving speed.Under the same step height,the impact of VBBH on driving safety is obvious with increased driving speed.With the speed of 100km / h,a significant impact on driving safety is discovered if the step height is more than 1.97cm.When the step height is more than 4.52cm,appropriate measures such as speed limit or installing slab must be taken,as it has a serious safety impact.