为了探究轻型高速公路路线纵断面设计关键参数,基于Carsim/Trucksim软件搭建了人-车-路耦合系统,根据普遍性和不利性原则,选取轿车、面包车和轻型货车作为轻型车辆的代表性车型,开展了代表性车型在直坡路段和弯坡组合路段的行驶仿真.根据轻型车辆在纵断面和弯坡组合路段运行特征,确定了轻型高速公路的控制车型以及路线纵断面的坡度、坡长参数.结果表明:轻型高速公路纵断面设计参数应以轻型货车和面包车作为控制车型;高速行驶下,车辆在弯坡组合路段的速度衰减比在单纵坡路段更为剧烈;根据速度衰减特性和允许速度降幅,轻型高速公路设计速度为100 km/h时,若允许轻型货车通行,应以比功率为25 W/kg的轻型货车作为控制车辆,路线纵断面最大纵坡为5%,最大坡长为750 m,若不允许轻型货车通行,路线纵断面最大纵坡为6%,可不限制最大坡长;设计速度为120 km/h和140 km/h时,应以比功率为35 W/kg的面包车作为控制车辆,路线纵断面最大纵坡分别为6%和5%,对应的最大坡长均为1 200 m.
Research on vertical section index of light expressway based on 3D alignment
A body-vehicle-road coupled system was built based on Carsim/Trucksim to explore the key parameters of light express-way route profile design.According to the principle of universality and disadvantage,car,minivan and light truck were selected as the representative models of light vehicles,and the driving simulation of the representative models on the straight slope road and the curved slope road was carried out.According to the operation characteristics of light vehicles in the profile and curve slope combina-tion sections,the control vehicle type of light expressway and the gradient and slope length parameters of route profile were deter-mined.The results show that light trucks and minivans should be used as the control vehicles for the longitudinal design parameters of light highways.When driving at high speed,the speed attenuation of vehicles in the curve slope combination section is more severe than that in the single longitudinal slope section.According to the characteristics of speed attenuation and allowable speed reduction,when the design speed of the light expressway is 100 km/h,the light truck with the specific power of 25 W/kg should be used as the control vehicle.If light trucks are permited to pass,the maximum longitudinal slope of the route profile is 5%,and the maximum slope length is 750 m.If light trucks are not allowed to pass,the maximum longitudinal slope of the route profile is 6%,and the maximum slope length may not be limited.When the design speed is 120 km/h and 140 km/h,the van with the specific power of 35 W/kg shall be used as the control vehicle.The maximum longitudinal slope of the route profile is 6%and 5%respec-tively,and the corresponding maximum slope length is 1 200 m.
light freewayspassenger car freewayshighway alignmentvertical sectionbody-vehicle-road coupled system
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