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1工程概况大河湾隧道是金沙江溪洛渡水电站对外交通专用公路的重难点控制工程,位于四川省雷波县境内,隧道穿越金沙江北岸一山体,进口山体呈壁立台阶陡坎状,相对高差大于300m,隧道最大埋深超过800m。隧道全长3116m,设计行车速度为40km/h,为汽车专用二级公路。
1 Project Overview The Dahewan Tunnel is a heavy and difficult point control project for the Xiluodu Hydropower Station on the Jinsha River. It is located in Leibo County, Sichuan Province. The tunnel traverses a mountainous bank on the north bank of the Jinsha River. The entrance mountain has a wall-shaped step with a steep ridge with a relative height difference greater than 300m, the maximum depth of the tunnel more than 800m. The tunnel has a total length of 3116m and a designed driving speed of 40km / h, which is a second-class highway for automobiles.