1、概述从成都西进康藏地区,二郎山段是第一座大山隘口。由于所处地形、地质环境特别复杂,气候条件十分恶劣,自建成通车四十多年来,一直遭受着暴雨、浓雾、积雪、冰冻、大风、寒冷等六大灾害性气候的威胁和崩塌、滑坡、泥石流等病害的困扰,事故多发,经常断 1, Overview From the west into the Chengdu-Tibet region, Erlang Mountain section is the first mountain pass. Due to its terrain, the geological environment is particularly complicated and the weather conditions are very poor. Since it was completed and opened to traffic for more than 40 years, it has been under the threat and collapse of the six catastrophic climate such as heavy rain, heavy fog, snow cover, freezing, windy and cold , Landslides, landslides and other diseases plagued the accident prone, often broken