公路缓和纵坡的设置条件及长度确定

Setting conditions and length determination of the gentle longitudinal grade of the highway

针对JTG D20—2017公路路线设计规范缓坡设计理念,就是在设计原则确定的情况下,纵坡设计从机械地运用规范到基于车辆运行速度设计理念,从纵坡设计原理上考虑纵坡坡度、坡长以及缓和坡段的坡度与坡长,重点探讨缓和纵坡的设置条件及长度。

In view of the gentle slope design concept of“Design Specification for Highway Alignment”(JTG D20—2017),which is based on the design principles,the longitudinal slope design is from the mechanical application of specifications to the design concept based on vehicle running speed.From the longitudinal slope design principle,the longitudinal slope gradient,slope length and the gradient and slope length of the gentle slope section are considered.The setting conditions and length of the gentle longitudinal slope are mainly discussed.