论文部分内容阅读
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。
Due to the limitation of land use, topography and geology, the vertical slope is often forced to use the standard recommended limit values. However, no stipulation is made for the longitudinal slope length below 5% in China’s Urban Road Design Code (CJJ37-90) Determine the reasonable slope length of such a longitudinal slope directly affects road traffic safety, efficiency, engineering economy. Based on the analysis of the existing results of longitudinal slope length limitation research, it is proposed that the calculation of slope length using vehicle dynamics should take into account the situation of shifting gears in the car slope and introduce the concept of appropriate vehicle model. Based on the actual situation of road traffic composition Situation to determine the slope length. The influence of slope length on driver heart rate growth rate, brake drum temperature and accident rate was analyzed, and the maximum slope length under each influence factor was determined. At last, a method to determine the length of slope is put forward, which considers the traffic efficiency and safety. The method is applied in the longitudinal slope demonstration of a large longitudinal section.