位于四川凉山自治州木里、盐源、冕宁交界处的雅砻江上,处于三大河湾之一的锦屏大河河湾中间,为锦屏一、二级、卡拉等水电站服务的特长交通隧道,又是锦屏二级水电站引水隧道施工超前的勘探洞和辅助洞,历时近5年建设,最近实现双洞贯通。隧道最大埋深为2375m,埋深大于1500m的洞段 Located in the Yalong River at the junction of Muli, Yanyuan and Mianning in Liangshan Autonomous Prefecture, Sichuan Province, it is the center of Jinping River Bay, one of the Three Rivers and one of the special traffic tunnels serving hydropower stations such as Jinping No.1, No.2 and Kara. It is also an exploration hole and auxiliary hole ahead of Jinping II Hydropower Station diversion tunnel. It lasted nearly five years and recently achieved double-hole penetration. The maximum depth of the tunnel is 2375m, with a depth of more than 1500m