环形匝道平面线型对建设用地及行车安全影响  

Influencing of circular ramp plane line type on construction land and driving safety

作　　者：郭胜 倪旭 龚臻 张乐 何云勇 陈沛 Guo Sheng;Ni Xu;Gong Zhen;Zhang Le;He Yunyong;Chen Pei(Sichuan Provincial Transportation Key Project Work Center,Chengdu Sichuan 610041,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu Sichuan 610041,China)

机构地区：[1]四川省交通运输重点项目工作中心,四川成都610041 [2]四川省公路规划勘察设计研究院有限公司,四川成都610041

出　　处：《山西建筑》2024年第14期136-139,179,共5页Shanxi Architecture

基　　金：四川省交通运输科技项目(2023-A-08,2021-A-03,2018-A-04)。

摘　　要：为保障车辆安全行驶且同时减小互通立交的占地规模,增加工程经济性,采用控制变量法分析了环形匝道平曲线半径和缓和曲线参数对占地的影响,并从行车稳定性和运行速度讨论环形匝道的行车安全,提出考虑环形匝道建设经济性、行车安全性的解决措施,并结合实际案例进行说明。结果表明,环形匝道平曲线半径对占地面积的影响高于缓和曲线参数,前者导致占地面积二次幂级增长,后者导致占地面积线性增长;当设计时速一定时,环形匝道横向力系数均随平曲线半径的增大而减小,且减小速率不断降低,符合反比例函数变化规律;环形匝道平曲线半径一定时,横向力系数均随运行速度的增大而增大,增长速率不断增大,符合二次函数变化规律。针对平原微丘区和山岭重丘区等不同地貌,提出了公路环形匝道平面半径的建议取值,供设计人员参考使用。To ensure the safe driving of vehicles and reduce the land occupation scale of interchanges at the same time,the engineering economy is increased.The control variable method was used to analyze the influence of the horizontal curve radius and transition curve parameters of the ring ramp on the land occupation,and the traffic safety of the ring ramp was discussed from the traffic stability and running speed.The solution measures considering the economy and traffic safety of the ring ramp construction were proposed,and the actual case was explained.The results show that the influence of the radius of the horizontal curve of the annular ramp on the occupied area is higher than that of the transition curve parameters.The former leads to the second power growth of the occupied area,and the latter leads to the linear growth of the occupied area.When the design speed is constant,the lateral force coefficient of the annular ramp decreases with the increase of the radius of the horizontal curve,and the decrease rate decreases continuously,which conforms to the change law of the inverse proportional function.When the radius of the horizontal curve of the annular ramp is constant,the lateral force coefficient increases with the increase of the running speed,and the growth rate increases continuously,which conforms to the quadratic function change rule.In view of different landforms such as plain micro-hilly area and mountain heavy hill area,the recommended value of plane radius of highway annular ramp is put forward for designers’reference.

关 键 词：互通式立交 环形匝道 立交用地 行车安全 线型指标 

分 类 号：TU248[建筑科学—建筑设计及理论]