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
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.
road engineeringhigh bridge-tunnel ratiotunnelportalconnecting lane
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