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南水北调西线工程长—恰线引水隧洞地处海拔３０００ｍ以上的青藏高原，隧洞全长１３１ｋｍ，埋深４０～１２００ｍ，开挖洞径１０９ｍ。通过对全断面掘进机（ＴＢＭ）法和钻爆法施工的比较，选定双护盾式ＴＢＭ施工，平均月进尺４００ｍ，选用电机车牵引的有轨矿车出渣和机械辅助坑道的混合式通风方案，施工所需风量为２２３６ｍ３／ｍｉｎ。对施工中可能遇到的岩爆、断层破碎带及涌水等地质问题提出了技术处理措施。
Long Route of South-North Water Diversion Project - Tied-line diversion tunnel is located in the Qinghai-Tibet Plateau at an elevation of 3000m with a total length of 131km, a depth of 40 ~ 1200m and a tunnel diameter of 10.9m. Through the comparison of TBM method and drilling and blasting method, double-shield TBM construction is selected, the average monthly footage is 400m, the mixture of tramcar tractor trolley and mechanical auxiliary tunnel Ventilation program, the required air volume for the construction of 2236m3 / min. Technical measures are put forward for geological problems such as rock burst, fault fracture zone and gushing water that may be encountered in construction.