山区隧道口附近枢纽立交方案设计

Design of an Interchange Near the Exit of A Tunnel in Mountainous Terrain

公路路线设计规范要求在当条件受限时,隧道出口至前方互通式立体交叉减速车道渐变段起点的距离不应小于1000m。在山区高速公路的立交设计中可能会难以满足要求,此时如何进行立交设计,规范无具体说明。介绍了一座在隧道出口附近的枢纽立交设计思路,供类似工程参考。

Under the requirement of the highway route design specification,the distance from the exit of a tunnel to the start point of the transition section of a deceleration lane should not be less than 1000 meters,when the terrain conditions are limited.However,the design of an interchange in mountainous terrain is found to be difficult to meet the requirement.The highway route design specification does not instruct how to design an interchange in such condition.This article will describe an idea of how to perform the design of an interchange near the exit of a tunnel in mountainous terrain.Hopefully the idea can be used as a reference for similar project.