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针对设计速度80km·h-1的四车道一级公路改建为同等速度四车道高速公路后的交通适应性问题,通过现场测速对比分析了高速化前后典型路段上的运行速度,并应用运行速度分析了线形的连续性和设计一致性;基于实测三轴加速度,分析了平、竖曲线高速化后行车的力学性能;应用最新版IHSDM软件预测了交通事故,并对比分析了高速化前后的交通安全状况。研究结果表明:高速化后小型车的运行速度明显提高,尤其在非几何受限路段及下坡路段,且对线形变化更加敏感,对线形设计均衡性提出更高要求;高速化后在小半径平曲线上小型车有明显的超高不足倾向,在小半径竖曲线上竖向加速度增大且有舒适性变差趋势;高速化后事故率普遍下降,降幅达高速化前的12.4%~20.32%。
Aiming at the problem of traffic adaptability after the reconstruction of a four-lane highway with a design speed of 80km · h-1 to an equivalent speed four-lane expressway, the running speeds on the typical sections before and after the speeding are compared and analyzed through on-site speed measurement. Based on the measured three-axis acceleration, the mechanical performance of the vehicle after the flattened and vertical curves were analyzed. The traffic accident was predicted by the latest version of IHSDM software. The traffic safety before and after high-speed operation was compared and analyzed. situation. The research results show that the running speed of small vehicles after high-speed is obviously improved, especially in non-geometrically restricted sections and downhill sections, and is more sensitive to the linear changes, which puts forward higher requirements on linear design balance. After high-speed operation, The small cars on the curve have obvious tendency of ultra-high deficiency, and the vertical acceleration increases on the small-radius vertical curve and tends to be less comfortable. The accident rate after high-speed reduction generally drops to 12.4% -20.32% .