城市道路缓和曲线最小长度研究  

Research on Minimum Transition Curve Length of Urban Road

作　　者：董华珍 DONG Huazhen

机构地区：[1]广州地铁设计院施工图咨询有限公司,广东广州510010

出　　处：《城市道桥与防洪》2022年第12期222-225,I0019,共5页Urban Roads Bridges & Flood Control

摘　　要：为提高行车安全性及舒适性,弥补道路缓和曲线长度现行设计方法的不足,针对城市道路缓和曲线最小长度规范取值局限性及设计中存在的问题,分析研究了缓和曲线最小长度的计算方法及规范取值的侧重点,首次提出了满足汽车离心加速度变化率、考虑驾驶者操作反应时间、超高因素和视觉美观性等4种情况下城市道路缓和曲线最小长度计算模型。研究结论为:在不涉及圆曲线超高情形下,应着重考虑汽车离心加速度变化率、驾驶者操作反应时间等因素对道路缓和曲线长度的影响,当设计车速V≤50 km/h时,缓和曲线最小长度取值与规范取值一致,当设计车速V>50 km/h时,缓和曲线最小长度取值比规范取值大5 m;在涉及圆曲线超高情形下,应综合考虑汽车离心加速度变化率、驾驶者操作反应时间、超高因素和视觉美观性等因素对道路缓和曲线长度的影响。In order to improve the driving safety and comfort, and make up for the deficiency of the current design method of road transition curve length, aiming at the limitations of the specification for the minimum transition curve length of urban roads and the problems existing in the design, the calculation method and the standard value emphasis of the minimum transition curve length are analyzed and studied.Firstly, a model of calculating the minimum transition curve length of urban roads is proposed under four conditions of satisfying the change rate of vehicle centrifugal acceleration, considering the driver operation reaction time, the ultra-high factors and the visual aesthetics. The study conclusion shows that the influence of the change rate of vehicle centrifugal acceleration, the operation reaction time of driver and the other factors on the transition curve length of road should be specially considered in the case where the circle curve is not too high. When the design speed is less than or equal to 50 km/h, the calculation result is consistent with the specification value, when the design speed is greater than 50 km/h, the minimum length value of transition curve is 5 m larger than the standard value. In the case where the circle curve is too high, the influence of the change rate of vehicle centrifugal acceleration, the operation reaction time of driver and the ultra-high factors and the visual aesthetics on the transition curve length of road should be comprehensively considered.

关 键 词：城市道路 缓和曲线最小长度 计算模型 超高渐变率 离心加速度 

分 类 号：U411[交通运输工程—道路与铁道工程]