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1 000 m.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.本文介绍一座在隧道出口附近的枢纽立交设计思路及其方案的确定.

Required by the specification for highway route design under confined conditions,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 1 000 meters.However,the design of an interchange in mountainous terrain may be found difficult to meet the requirement.Yet there is no specific instruction with respect to interchange design.This paper introduces an idea about designing an interchange near the exit of a tunnel in mountainous terrain and its solution is provided.