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首先,比较分析了国内外高速公路纵坡设计的控制标准(如最大坡度、最小坡度和最大坡长)及其影响因素;其次,对中国现有主要的卡车动力性能进行了调查,确定了不同类型卡车的平均质量/功率比(W/P);第三,对车辆爬坡能力的理论计算进行了分析评价,确定了绘制车辆爬坡速度-距离曲线的可行途径,并根据山西省交通量的实际车辆类型及其比率,推荐了山西省纵坡设计的代表性车型,在实测车辆速度的基础上,给出了代表性车型的速度-距离曲线。最后,根据允许车辆速度差的要求,为山西省高速公路纵坡设计提出了最大坡长推荐值。
First of all, the control standards (such as maximum slope, minimum slope and maximum slope length) and their influencing factors of longitudinal longitudinal slope design at home and abroad are comparatively analyzed. Secondly, the dynamic performance of the main existing trucks in China is investigated to determine the difference The average mass / power ratio (W / P) of the type trucks; thirdly, the theoretical calculation of the vehicle climbing ability is analyzed and evaluated, the feasible route of drawing the vehicle climbing speed-distance curve is determined, and according to the traffic volume of Shanxi Province Based on the measured vehicle speed, the speed-distance curve of the representative model is given. Finally, based on the requirements of the allowable vehicle speed difference, the recommended value of the maximum slope length is proposed for the longitudinal slope design of Shanxi Expressway.