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国内开挖断面最大、洞线最长的引水发电隧洞工程——四川岷江太平驿水电站引水隧洞于1993年6月13日全线开挖贯通,为确保1994年底第一台机组发电打下了基础。太平驿水电站压力隧洞处于晋宁-澄江期黑云母花岗岩、闪长岩的岩浆岩体中,埋深200～850m,全长10.469km,开挖洞径
The largest diversion tunnel project with the largest excavation cross section and the longest cave line in China - The diversion tunnel of the Taipingyi Hydropower Station on Minjiang River was dug through the entire line on June 13, 1993, laying a foundation for ensuring the first generation power generation at the end of 1994. The pressure tunnel of Taipingyi Hydropower Station is located in the magmatic rock of the Jinning-Chengjiang biotite granite and diorite with depth of 200 ~ 850m, total length of 10.469km, tunneling diameter