高速公路改扩建路线设计应用研究

Application Research on Reconstruction and Extension of Expressways Alignment Design

近年来我国在高速改扩建项目中积累了不少经验,但因改扩建工程的特殊性,路线设计面临诸多复杂问题,包含超多车道高速公路改扩建。针对改扩建工程中的路线设计,以广州市北二环高速公路改扩建项目为例,主要分析路线的平面、纵面和超高等方面设计,其中包括平面线形指标确定、中央分隔带左转弯停车视距不足的处理,以及改善纵坡、竖曲线大小等,并给出了超多车道高速公路改扩建面临的超高设计处理方式。经优化后的路线设计方案,较好地提升了行车舒适性和安全性,可为相关高速公路改扩建项目路线设计提供参考。

In recent years,a lot of experience in expressway reconstruction and expansion projects has been accumulated.However,due to the particularity of reconstruction and expansion projects,route design faces many complex problems,especially for super-multi-lane expressway reconstruction and expansion.In this paper,taking the Guangzhou North Second Ring Expressway reconstruction and expansion project as an example,the design of route is analyzed in terms of plan,profile and super elevation,including the determination of plan linear indicators,the treatment of insufficient left turn stopping sight distance in the central divider,and the improvement of longitudinal slope and size of vertical curve.The super elevation design treatment methods for super-multi-lane expressway reconstruction and expansion is also proposed.After optimization,the route design scheme improves driving comfort and safety,and can provide reference for route design of related expressway reconstruction and expansion projects.