以路面排水为导向的超高渐变方式研究

张淑宝¹，曹宏斌¹，沈嘉豪²，陈建聪²，程建川²

1.福建省高速公路建设总指挥部，福建 福州   350001；2.东南大学交通学院，江苏 南京   211189

摘要：为解决当前高速公路存在的部分平曲线路段路面积水问题，采用分段线性超高过渡方法，通过增大超高过渡段中零坡度附近缓坡区间（－1.5%~1.5%）的超高渐变率，达到易积水路段快速过渡的效果，降低路面积水风险、提高车辆驾驶安全性；基于水膜厚度及道路几何特性检验道路渐变段设计，对分段线性与整体线性超高渐变两种方式在同一工况下的模型分析结果与数值计算结果进行对比。结果表明：分段线性超高过渡方式在过渡段坡面坡度分布、排流方向与流线长度以及断面水膜厚度与横向分布指标上更安全；分段线性超高过渡策略能有效减小平坡段路面水膜厚度，缩小路面积水影响区，提高行车安全性，验证了分段线性超高过渡方式的可行性与合理性。

关键词：超高过渡；超高渐变率；路面排水；水膜厚度；高速公路；道路路线设计

Ultra-high gradient method oriented to surface drainage

ZHANG Shubao¹, CAO Hongbin¹, SHEN Jiahao², CHEN Jiancong², CHENG Jianchuan²

1. Fujian Provincial Expressway Construction Headquarters, Fuzhou 350001, China;

2. School of Transportation, Southeast University, Nanjing 211189, China

Abstract: In order to solve the problem of road area water in some horizontal curve sections of expressways, a piecewise linear method for ultra-high transition is proposed. By increasing the ultra-high gradient rate of the gentle slope interval (-1.5 %–1.5 %) near the zero slope in the ultra-high transition section, the effect of rapid transition of water-prone sections is achieved, thereby reducing the risk of road area water and improving the safety of vehicle driving. At the same time, this paper tests the design of the road gradient section based on the water film thickness and the geometric characteristics of the road. Through the model analysis and numerical calculation comparison of the two methods of piecewise linear and overall linear super-elevation gradient under the same working condition, it is concluded that the piecewise linear super-elevation transition mode is safer in the slope gradient distribution, drainage direction and streamline length of the transition section, as well as the water film thickness and lateral distribution index of the section. The calculation results show that the piecewise linear super-elevation transition strategy can effectively reduce the water film thickness of the road surface in the flat slope section, narrow the water-affected area of the road area, and improve the driving safety. The feasibility and rationality of the piecewise linear ultra-high transition mode are verified.

Keywords: superelevation transition; superelevation transition rate; pavement drainage; thickness of water film; highway; road alignment design