基于驾驶模拟的十车道高速改扩建缓和曲线设置标准研究

Study on Setting Criteria for Transition Curves in Ten-Lane Expressway Reconstruction and Expansion Based on Driving Simulation

摘要:

改扩建高速公路提高设计速度后，原有未设置缓和曲线的路段需要增设，但增设缓和曲线带来的安全效益与投入成本并不匹配。为满足国内改扩建工程的实际需要，研究高速公路缓和曲线的设置条件，通过驾驶模拟实验，基于驶入和驶出圆曲线时的驾驶稳定性分析，提出了缓和曲线的设置标准，结合国外相关规范规定，确定不设缓和曲线时圆曲线半径阈值。结果表明：当圆曲线半径低于3 000 m时，不设置缓和曲线对驾驶员操作的影响开始增加；曲线半径低于1 500 m时，不设置缓和曲线对驾驶员操作产生显著影响；最后建议当设计速度为120 km/h时，不设置缓和曲线的圆曲线最小半径为4 000 m。研究结论能够为公路改扩建的成本控制提供参考，有利于提高路线设计的科学性。

Abstract:

After the reconstruction and expansion of expressways to increase the design speed, it is necessary to add the road sections to those originally not to set the transition curves. However, the safety benefits brought by adding transition curves do not match the investment costs. In order to meet the practical need of the reconstruction and expansion projects in China, the setting conditions of transition curves for expressways are studied. Through the driving simulator experiments, and based on the analysis of the driving stability during entering and exiting circular curves, the criteria for setting the transition curves are proposed. In accordance with relevant foreign norms and regulations, the threshold for the radius of the circular curve is determined when no transition curve is set. The results indicate that when the radius of the circular curve is less than 3000m, the impact of not setting a transition curve on the operation of drivers begins to increase. When the curve radius is less than 1500m, not setting a transition curve will have a significant impact on the operation of drivers. Finally, it is recommended that when the design speed is 120km/h, the minimum radius of a circular curve without a transition curve is 4000 m. The research conclusion can provide the reference for the reconstruction and expansion of expressways, which is conducive to improving the scientific nature of route design.