摘要
城市道路几何设计中要求圆曲线内侧清除障碍物满足视距要求。满足视距要求对地下道路的安全尤为重要,尤其是小半径圆曲线,地道内侧墙壁横净距是否满足视距包络线往往被设计人员所忽视。根据视距包络线的几何性质推导包络线上任意点的坐标,提出不同圆曲线段半径所需的最小加宽值。视距包络线的计算方法对圆曲线半径的视距验算具有指导意义。
Urban road geometric design requires the circular curve inside to clear obstacles to meet the requirements of sight distance.It is especially important for underground road safety to meet the requirements of sight distance.Particularly for the circular curve with small radius,whether the tunnel inside wall horizontal distance can meet the requirements of sight distance envelope line is often neglected by the designers.According to the geometric properties of sight distance envelope line,the coordinates of any point on the envelope line are deduced,and the minimum width of different circle curve section radius is proposed.The calculation method to sight distance envelope line is of guiding significance to check the sight distance of the circular curve radius.
出处
《中国市政工程》
2017年第5期74-78,共5页
China Municipal Engineering
关键词
地下道路
平曲线半径
视距包络
underground road
horizontal radius
sight distance envelope
