基于安全评价的山区高速公路越岭线纵坡设计方法研究

Longitudinal Slope Design of Mountainous Expressways Based on Safety Evaluation

山区高速公路由于地形及其他条件限制,越岭线纵坡设计时常需采用长大上坡或长陡下坡,易存在安全隐患。文中提出了通过安全评价辅助山区高速公路纵坡设计的方法,基于运行速度分布特征及其协调性、一致性的分析,对初步设计方案的大型车连续长上坡通行能力及连续陡下坡车辆制动器上升温度进行安全性评价,综合考虑技术经济因素,提出纵坡优化设计方案,并通过工程实例证明了该方法的适用性及安全评价对设计的指导意义。

Because of the constraints due to topography,long-steep longitudinal slope is very common in design of mountainous expressways,which is not favorable for drive safely.In this paper,a longitudinal slope design method assisted by safety assessment is put forward,which is based on the analysis of the driving speed distribution feature and its coordination and consistency.According to the result,the traffic capacity of large vehicle at continuous long uphill segment and the brake drum temperature rising at continuous long downhill segment are evaluated in terms of safety.Comprehensively consider the technical and economic factors,an optimization design scheme for longitudinal slope is proposed.The applicability of the method and the significance of safety evaluation to design are verified through a project example.