山区高速公路立交及隧道出口“小间距”设计技术探讨

为保证高速公路主线行车快速、安全、顺畅，对主线上进、出口数量应加以控制，JTGD20--2006（（公路路线规范》对高速公路互通式立交之间、互通式立交与隧道出口及有出入口的其他设施（如停车区、服务区等）的最小距离均有规定，但在地形、地质及环境条件非常恶劣的山区，满足这些规定十分困难。结合实际经验，对“小间距立交”设计进行探讨，并提出相应的措施。

Probe into Design Techniques for ＂Small Space＂ between Interchanges and Tunnel Exits on Expressways in Mountainous Area

In order to guarantee fast, safe and smooth driving on main lines of expressways, the number of entrances and exits on main lines should be controlled. JTG D20-2006 ＂ Highway Route Specification＂ stipulates the minimal distance between expressway interchanges, between interchanges and tunnel exits and other facilities with exits （ such as parking lots and service zones, etc. ） , however in mountainous area with very hostile topographic, geological and environmental conditions, it＇s quite hard to satisfy these provisions. In combination with practical experiences, this paper discusses design of ＂ small space interchanges＂ and proposes corresponding measures.