高速公路大型车弯道行驶安全性及限速研究

Research on Safety and Speed-limit of Oversize Vehicle on Expressway Curve Sections

为了提高大型车在高速公路弯道行驶的安全性,分析了大型车在弯道路段发生交通事故的统计特性,确定了大型车在弯道行驶横向稳定性的研究范畴为侧滑和侧翻,并给出了刚性车辆、带悬架车辆的准静态侧翻极限车速以及瞬态侧翻极限车速的计算方法。最后从实际调查、视距模型和VISSIM仿真三个方面研究了大型车在弯道行驶的安全车速,对其结果进行对比分析,得出了大型车在不同弯道半径条件下的限速建议值。研究结果表明:当弯道半径R分别为1 000m、650m、500m、400m、300m、200m时,建议限速值分别为75km/h、65km/h、60km/h、55km/h、45km/h、35km/h,为提高大型车的弯道安全性提供了理论依据。

In order to improve the safety of oversize vehicles in curved sections of expressway, the statistical characteristics of oversize vehicle traffic accident is analyzed. The research categories of oversize vehicle lateral stability in curve sections are sideslip and rollover. The quasi-static and transient rollover＇s utmost speed calculation method of rigid vehicles and vehicles with suspension system is put forward. Finally, the oversized vehicle operating safety speed in curved sections is studied from the actual survey statistic results, braking model of stopping sight distance and VISSIM simulation model. Analysis and comparison are made on the obtained results, and the recommended speed-limit values are presented. The results indicate that when the curve radii R are 1000m, 650m, 500m, 400m, 300m and 200m, the suggested speed-limit values are respectively 75 kin/h, 65 km/h, 60 km/h, 55 kin/h, 45 kin/h, and 35 km/h. It provides a theoretical basis for improving the oversize vehicle safety in curved sections.