基于交通效率、安全和特定交通组成的纵坡合理坡长

由于用地及地形、地质等限制,纵坡常被迫用到规范推荐的限制值,而我国《城市道路设计规范》(CJJ37-90)对5%以下的纵坡坡长限制没有进行规定,如何确定此类纵坡的合理坡长直接影响到路段交通安全、效率、工程经济等。通过对已有的纵坡坡长限制研究成果整理分析,提出运用汽车动力学进行坡长计算时,应该考虑汽车坡中换档的情况,并引入适合车型的概念,建议根据道路交通组成的实际情况确定坡长。分析坡长对驾驶员心率增长率、制动鼓温度、事故率的影响,分别确定各影响因素下的最大坡长。最后提出综合考虑交通效率和安全的坡长限制确定方法,并在某大纵坡路段的纵坡论证中进行了应用。

Reasonable Vertical Slope Length Based on Traffic Efficiency, Safety and Special Component

Because of land using,landform and geological restriction,limitative vertical slope grade recommended in specification are compelled to be used.However,there is no regulating for vertical slope length restriction under 5% in Design Specification of Urban Road(CJJ 37-90) in China.It affects traffic safety,efficiency and engine economy that how to confirm these slope length.This paper puts forward the condition of shift shelves in slope should be considered according to the analysis of existing slope length study harvest.It also introduces the suit-vehicle concept and suggestes that slope length should be confirmed by road traffic component.And it analyzes vertical slope length's affection to drivers' increasing rate of heart beat,break drum temperature,accident rate,and confirms the maximum slope length in different affective factors.Last,this paper puts forward vertical slope length confirming method considering traffic efficiency and safety synthetically,and applies it to an argumentation of a great vertical slope segment.