高桥隧比条件下桥隧相连的隧道洞口联络道设计探讨——以重庆巫溪至陕西镇坪高速公路为例

Discussion on the Design of Tunnel Portal Connecting Lane Based on the Condition of High Bridge-tunnel Ratio Using Chongqing Wuxi to Shaanxi Zhenping Expressway as an Example

为确定高桥隧比条件下高速公路桥隧相连的特长隧道洞口联络道的转换长度和结构形式,采用数值模拟方法,选用18.1 m的长头铰接列车为典型车辆,针对10 m~30 m五种左右幅间距及0°~45°四种行驶转换角度,模拟车辆行驶轨迹并计算联络道通行的最小长度。结果表明:1)在满足转换车道基本长度的前提下,模拟隧道洞口联络道推荐长度采用30 m或40 m;2)基于模拟结果推荐的联络道长度,为超高桥隧比的巫镇高速隧道洞口联络道设计提供了重要的基础依据;3)在运营期间,该高速的洞口联络道实现了养护维修或异常工况下的交通转换,有效提升了道路防灾减灾和运营养护能力,为类似工程的设计提供了有益参考。

In order to define the transition length and structural form of the connecting lane at the portal of the long special tunnel between the bridge and tunnel on the expressway under the condition of high bridge-tunnel ratio,this paper selects suitable vehicle types and simulates the driving trajectories of vehicles at different left-right lane spacings of 10 m~30 m,as well as different turning angles from 0-45°using numerical simulation methods.The minimum length of the connecting lane is calculated through software simulation.The simulation results indicate that:1)A recommended length of 30 m or 40 m should be used for the tunnel connecting lane,under the premise of meeting the basic length of the transition lane;2)The recommended length of the connecting lane based on the simulation results provides an important basis for the design of the connecting lane for the Wuxi-Zhenping expressway with a high bridge-tunnel ratio;3)During operation,the connecting lane enables smooth traffic transitions in emergency rescue,maintenance,or abnormal conditions,effectively improving road traffic efficiency,disaster prevention and reduction,and operational maintenance capabilities,and providing valuable reference for similar engineering designs.