山区高速公路相邻组合路段设计安全评估

Safety Evaluation of Adjacent Combined Alignments of Mountain Freeway

摘要:

利用驾驶模拟技术，基于湖南省永吉高速公路道路设计参数及周边地形环境参数，搭建了山区高速公路驾驶场景.以直线与平曲线及平曲线与平曲线两类相邻组合路段为研究对象，从实验设计、数据处理、指标选取、模型建立方面介绍了以驾驶模拟数据为基础的道路安全评价方法.实验结果表明，直线与平曲线相邻路段，直线长度、运行车速均与断面车速差呈正相关；平曲线与平曲线相邻路段，前一平曲线路段长度、前后平曲线半径之比均与断面车速差呈正相关.根据断面车速差分布特征，可将相邻组合路段线形安全性划分为“GOOD”，“FAIR”和“POOR”.

Abstract:

In this paper, the driving simulator was used to realize the roadway scenario for Yongji freeway in Hunan Province, China. The driving scene was reproduced in virtual reality by the exact road design parameters and roadside elements from the design blueprint. The research objects are tangent + horizontal curve combined alignment and continuous horizontal curves combined alignment. The safety evaluation method was introduced based on the driving simulation data in terms of experimental design, data processing, indicator selection and model building. The results indicate that speed differential is positive correlated to the length of tangent segment and operating speed in the model of tangent + horizontal curve combined alignment, and it is also positive correlated to the length of the first horizontal curve and the ratio of curvature radius in the model of continuous horizontal curves combined alignment. The 50th/85th percentile values of the speed differentials are found as the safety thresholds of “GOOD”, “FAIR” and “POOR” according to their distribution.