基于视距的城市道路线形指标及优化措施研究

Research on Alignment Indicators and Optimization Measures of Urban Road Based on Sight Distance

城市道路由于受到建设条件制约经常会采用较小的平、纵线形指标,其中地下道路和高架道路的曲线路段由于受到中隔墙、侧墙、结构顶板或防撞墙、防眩设施、声屏障等结构物的影响,易造成视距不足,为道路运营带来了安全隐患。在总结分析行车视距验算方法及规范要求值的基础上,采用数值解析法计算得到城市道路不同设计速度和视距要求下的平曲线、竖曲线半径对应值,并提出了视距不足时的优化设计措施,以期为日后的相关工作提供参考。

Restricted by the construction conditions,the small horizontal and vertical alignment indicators are often used for the urban roads.The curved sections of underground road and elevated road are affected by the mid-partition wall,side wall,structural roof or anti-collision wall,anti-dazzle facilities,sound barrier and other structures,which are easy to cause the poor sight distance and bring the potential safety hazard.On the basis of summarizing and analyzing the calculation method of the sight distance for driving and the required value of specification,the corresponding values of the horizontal curve and vertical curve radiuses of urban roads under the different design speeds and sight distance requirements are calculated and achieved by the numerical analysis.And the optimization design measures for the poor sight distance are put forward in order to provide the reference for the similar projects in the future.