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新武界隧道及栗栖溪引水工程之隧道總長約16.5km,興建完成後將為台灣最長之水利隧道。其中,中游段之引水隧道艮約7.8km,因推估地質均質尚佳且無明顯之剪裂帶或斷層带存在,並為考慮縮短工期、降低對環境之衝擊、減少勞工需求及提昇台灣隧道工程施工技術等因素,決定採用安全且一貫連續快速作業之隧道鑽掘機(TBM)開挖施工。施工期間,於2001年11月份創下659.3m／月之台灣最快鑽掘紀錄,其後雖曾遭遇局部岩盤破碎或異常擠壓等不良地質,以及遭受桃芝颱風之暴雨肆虐成災,然於採取適當應變措施及處理得宜下,TBM終於克服困難並持續順利鑽掘,且於2002年6月7日成功貫通,完成鑽掘工作,為台灣隧道工程首次以TBM貫通案例,且達到最佳平均月進度(315m/月)及最大鑽掘長度(6523m)之新里程碑。
The total length of the tunnel for the New Wu-Chi Tunnel and the Li-Chi River Diversion Project will be about 16.5km and will be the longest water conservancy tunnel in Taiwan after completion of the project. Among them, the middle reaches of the diversion tunnel Burgundy about 7.8km, due to the estimated geological homogeneity is good and no obvious existence of the shear zone or fault zone, and to consider shortening the construction period, reduce the impact on the environment, reduce labor demand and upgrade Taiwan Tunnel Construction technology and other factors, decided to adopt a safe and consistent continuous rapid operation of the tunnel boring machine (TBM) excavation. During construction, the fastest drilling record of 659.3m / month in Taiwan was set in November 2001. Although it has suffered from adverse geological conditions such as partial broken or abnormally crushed rock disks and torrential rains resulting from typhoon Typhoon Pozhi, TBM finally overcome the difficulties and continued smooth excavation with appropriate contingency measures. The TBM was successfully completed on June 7, 2002 to complete drilling and excavation work. It was the first time that TBM tunneling project was completed in Taiwan and reached the best average New milestones in monthly progress (315m / month) and maximum drilling length (6523m).