基于曲率半径的公路超高设计方法

Superelevation design method based on curve radius

在高等级公路路线设计中,为保证行车舒适性,往往设置较长的缓和曲线以达到平面线形的协调和曲率的舒缓过渡。采用较长的缓和曲线时,超高过渡只在缓和曲线某一区段内进行。目前行业内对全超高断面的选择主要以《公路路线设计规范》为依据,将全超高断面设置于圆缓点(YH)或缓圆点(HY)上。发现该方法可能引起部分过渡路段反超高或超高不足。本文通过研究不同圆曲线半径与横向力系数和超高值的关系,提出基于曲率半径的超高设计方法。计算表明该法可有效弥补常规方法的不足,在运行速度偏高的公路中推荐采用。

In the high grade highway route design,a long easement curve is often set to ensure the smooth transition of curvature. In this case,the transition is only carried out in a section of the easement curve. At present,the way to choose the full-superelevation profile is based on the design specification for highway alignment,which will be set to the circular-easement point（ YH） or the easement-circular dot（ HY）. It is found that this method may lead to the reverse or wanton superelevation in partial transition sections. This paper studies the relationship among the radius,cornering ratio and the superelevation value,a superelevation design method based on curve radius is proposed. The calculation shows that this method can make up the deficiency of conventional method. it is recommended in high operating speed.