超高大樓基礎設計與施工（四）－臺北國際金融中心工址斷層及大地工程調查

Design and Construction of Highrise Building Foundations (IV)-Fault and Geotechnical Investigation for the 101-Story Taipei International Financial Center Site

陳斗生(Dunstan D. S. Chen)

《地工技術》 84期 (2001/04) Pp. 29-48

https://doi.org/10.30140/SG.200104.0001

摘要

臺北國際金融中心之101F超高大樓基地位於台北盆地東南隅，基地南側有存疑性活動逆衝斷層－台北斷層－通過，由區域性地貌研判並經工址調查證實基地下地層應在古沖蝕谷地附近，除軟弱湖相沉積土層外，尚有厚層崩積土層與土石流沖積土層，覆蓋於年輕之桂竹林層岩盤。為基礎設計與施工等之安全考量，土壤工址調查計畫分別於規劃、設計與施工各階段共執行了155孔之鑽探取樣及大量之各式室內及現地試驗以了解各地層水文分佈與工程特性；對台北斷層之確實位置及其活動性之評估與調查，除檢視大量文獻及既有調查資料外，並進行基地外之鑽探與大量之有孔蟲化石鑑定、微化石鑑定、岩相分析、黏土礦物分析及碳十四定年；確定台北斷層係距基地東南角約200公尺，且台北斷層至少四萬五千年來未有活動之跡象，工程上可視為非活動斷層。

關鍵字

工址調查 ； 土壤調查 ； 地質調查 ； 台北斷層 ； 湖相沉積土層 ； 崩積／沖積土層 ； 桂竹林層 ； 指準化石 ； 有孔蟲化石鑑定 ； 微化石鑑定 ； 岩相分析 ； 黏土礦物分析 ； 碳十四定年 ； 非活動斷層

並列摘要

The 101-Storey Taipei International Financial Center is located at SE boundary of Taipei Basin. Taipei (thrust) Fault is known to pass through the site vicinity. Assessed from the topographic conditions, and verified by site investigation, that the subsurface consists of lacustrine soft to stiff silty clay soil, coluvium/alluvial soils and underlain by pliocene Kwuitzulin Formation. A geotechnical site investigation program was conducted which consists of: (1) soil investigation program consists of 155-borehole sampling and large amount of field and lab testing during foundation planning, design and construction stages to define the subsurface soil, bedrock distribution, hydrographic condition and engineering characteristics; (2) geologic investigation program consists of reviewing and evaluating Taipei Fault related documents and records, drilling and sampling of 5 off-site deep borings, large amount of fossil idenfifications and carbon dating. Results indicate that Taipei Fault is about 200m from SE corner of the site, and the Fault has not being active for a minimum of 45,000 years and may be considered as non-active fault.

並列關鍵字

Site Investigation ； Soil Investigation ； Geologic Investigation ； Taipei Fault ； Lacustrine deposits ； Coluvium/Alluvium ； Kwuitzulin Formation ； Fossil ； Index Fossils ； Rock Formation Analysis ； C-14 dating ； Non-active fault