捷運工程於複合地層之大地議題與對策－以北捷土城線延伸頂埔段為例

張皓凱 ； 周忠仁 ； 張榮峰 ； 謝宇珩

《土木水利》 43卷2期 (2016/04) Pp. 34-41

https://doi.org/10.6653/MoCICHE.201604_43(2).0006

摘要

隨著台北捷運路網漸往外緣擴展，捷運工程除週遭環境之限制，也會通過複合地層，增加工程困難。本文以「臺北捷運土城線延伸頂埔段工程」為例，探討捷運工程於複合地層遭遇之大地議題及對策。本案例車站及隧道沿線所經之地層主要為卵礫石層及砂岩層，可預期於此複合地層及週遭環境之限制下對施工品質及效率會造成一定影響，故針對捷運工程於此複合地層遭遇之五項大地工程議題加以探討，內容包含站體連續壁於堅硬地層施作考量、潛盾隧道於複合地層與卵礫石層掘進、連絡通道地盤改良、隧道與既有營運中車站之銜接及破鏡施工考量、全生命週期隧道安全監測等大地工程議題。期藉由本工程於施工規劃所遭遇之困難與解決對策，作為後續類似工程之參考。

並列摘要

While Taipei MRT network continues to expand its route to the outskirt of the city, MRT construction would possibly encounter such environment restrictions as mixed ground that significantly increases the complexity and difficulty of the project. This paper presents the project of ＂Taipei MRT Tucheng Line Dingpu Section Contract DD170＂ as an example to look into the geotechnical engineering issues and countermeasures associated with mixed ground. The project encounters mixed ground of gravels and sandstone and a total of five issues were raised, such as diaphragm wall construction on gravels, TBM passing through mixed ground and gravels, ground treatment for cross passages, shield tunnels connecting to the operating MRT station, and the life-cycle monitoring for tunnel safety. The experiences and feedbacks obtained from these challenges are expected to provide references for similar projects.