士林水力發電工程頭水隧道隧道鑽掘機用於不良地質開挖災變處理

Treatment on Geological Hazards in TBM Tunnelling Of Headrace Tunnel in Shihlin Hydropower Project

傅重焌(C. C. Fu) ； 陳嘉男(C. N. Chen) ； 李慶龍(C. L. Lee)

《地工技術》 72期 (1999/04) Pp. 67-80

https://doi.org/10.30140/SG.199904.0007

摘要

鯉魚潭水庫士林水力發電工程於考量地質狀況、縮短工期及降低環境衝擊等因素，頭水隧道大部份係採用全斷面隧道鑽掘機（簡稱TBM）進行開挖及支撐。由於台灣島位處海陸板塊交會碰撞帶，地質複雜且變化大，亦多斷層及褶皺等構造，故TBM施工須掌握地質，以使隧道工程進行順利。而本工程頭水隧道地質堪稱均質尚佳，並無大構造，頗適合TBM施工，但難免遇局部含泥剪裂帶、節理破碎帶或膠結不良之岩盤疏鬆帶等不良地質，足以影響TBM施工安全，甚致導致抽坍，故在經探查及以不同工法修復處理，終使TBM順利鑽掘通過。本文簡要探討頭水隧道遭遇不良地質發生災變之施工處理，俾對爾後類似隧道工程之TBM設計及施工有所助益，進而有利於提升國內隧道施工技術，及TBM工法之推廣。

關鍵字

砂流 ； 節理破碎帶 ； 擠壓變形 ； 剪裂帶 ； 灌漿管幕工法 ； 導管式灌漿

並列摘要

Considering the geological condition, the excavation period and to reduce the environmental impact, a TBM (Tunnel Boring Machine) was employed for the tunnelling of the headrace tunnel of the Liyutan Reservoir Shihlin Hydropower Project. Since Taiwan is located on the collision zone between sea plate and continental plate from the plate tectonic theory, the geology is complex and varied. Fault and fold structures are well developed. Understanding geology is necessary for TBM's smooth progressing. The geological condition of the headrace tunnel is fair for TBM tunnelling. Local poor geology such as shear zone, fracture zones and loose rocks are encountered which are critical to the TBM excavation. With effective investigation and different treatment methods, collapse problems were overcome. This paper, introducing the treatment of the geological hazards, will be beneficial to future design and construction of similar tunnelling work, and TBM tunnelling promotion.

並列關鍵字

sand flow ； jointed fracture zone ； squeeze deformation ； shear zone ； grouting pipe roofing method ； sleeve pipe grouting