运行速度在公路线形质量设计中关键问题研究

Key questions of highway alignment quality design based on operating speed

针对设计速度法在公路线形设计中的诸多局限,研究了利用运行速度的线形设计方法,提出了运行速度的线形安全评价标准,通过对车辆实际运行速度的观测和分析,建立了运行车速预测模型,标定了平面要素影响运行速度的阀值,预测模型经过检验和验证后表明:模型的准确性和精度满足要求、模型预测值与实际观测值拟合良好;为推动运行速度法在我国公路线形设计中应用提供了有益的借鉴.

To solve the problem of the insufficiency in tradition design of alignment of highway,the method of highway alignment design based on operating speed were researched,quality valuation standard of highway alignment design for secondary highway were put forward.Based on field observations of traffic features and survey of operating speed,set up the prediction models of operating speed,got the threshold value of plane essential factor influence operating speed,the model were also verified and validated,results show that the model met the requirements of accuracy and precision,the model prediction and the actual observed values fit well,it will do more help on application of operating speed in the field of design of the alignment of highway.