水平灌漿地盤改良工法應用於軟弱黏土隧道之研究

摘要關鍵詞：水平地盤改良、雙柵管灌漿、潛盾隧道、軟弱黏土層國內各項土木或建築工程如於地質狀況不佳之區域施工，都將土層地質改良列為優先處理項目，以利後續工程之進行。於軟弱黏土層進行地盤改良已有許多工法可供參考使用，然臺北捷運內湖線CB420區段標為國內首宗潛盾隧道穿越機場下方之工程，需施作一座上下線隧道間聯絡通道作為緊急避難之用，因施工區域於臺北松山機場下方之位置特殊，且受限飛航管制嚴謹條件，無法在地面上以傳統方式向下施作灌漿以進行土層之改良，乃需在已完成潛盾隧道內以水平灌漿之方式進行土層改良施工，本研究介紹在日本發展多次使用之雙柵管灌漿工法，其應用在松山機場停機坪下方，潛盾隧道上下行線間聯絡通道施作前之地盤改良灌漿。松山機場地盤屬臺北盆地基隆河底軟弱粘土層，本研究先說明此種雙柵管灌漿地盤改良之施工程序方法，再檢視經灌漿改良後之黏土層強度及對機場滑行道停機坪之前後影響。文中敘述雙柵管灌漿工法地盤改良範圍，灌漿部位施作順序、材料配比、使用機具設備、灌注量等，至整體的施工程序及步驟內容，並於地盤改良灌漿作業中輔以各項監測儀器，用以觀察聯絡通道施作中各種之變化情形。在聯絡通道地盤改良完成後進行結構開挖施工，檢視黏土層在改良後其緊密度，經取樣土體平均單軸抗壓強度達523 kPa（5.23 kgf/cm2），符合CB420區段標施工技術規範200 kPa（2 kgf/cm2）以上強度目標，顯示雙柵管灌漿地盤改良工法於軟弱黏土層中施作效果良好，可為爾後遇有類似地質條件及工程因素時參考所用。

關鍵字

水平地盤改良；潛盾隧道；雙柵管灌漿；軟弱黏土層

並列摘要

ABSTRACT Keywords：ground improvement, level grouting Many domestic constructions carried out in poor geologic conditions have taken the ground improvement as the first item of treatment, for the convenience of follow-up item.In the flabbiness stick to a soil layer carry on site improvement already have many work methods can be provided as reference usage, however Taipei mass transit Nei-Hou line CB420 block mark for domestic the shield tunnel cross an airport under it engineering, need to make an upper bound and a lower bound tunnel,and a connoction for averting imminent danger, because of construction district in Taipei Sungshan airport under it position special, and be subjected to only for flights careful condition, can't on the ground in traditional way get down make infuse syrup with carry on a soil layer of improvement is needing in already the completion the shield the tunnel infuse syrup by level of the way carry on a soil layer improvement a construction, this research introduction in Japan develop many usages of the double grid tube infuse syrup work method, its application is in Sungshan of airport apron under, shield tunnel up and down go a line contact channel site provement before making infuse syrup. Airport site in Sungshan belongs to Taipei bottom of river in basin Keelung weak glue a soil layer, this research first explains this kind of pair grids tube infuses syrup site improvement of construction procedure method, then examine through infuse syrup to influence after improving the back it sticky the soil layer the strength and the rightness taxiway apron in the airport before.The description double in text grid tube infuses the improvement scope of the syrup work method site, infusing syrup part to make in proper order, the material go together with a ratio, use a machine tool equipment and infuse amount of Zhu etc., go to whole construction procedure and step content, and infuse syrup to assist with various monitors in the homework in the site improvement, in order to observe contact channel to make win various variety situation. BE contacting the improvement completion of the channel site juniors to go structure to open to dig a construction, examine sticky the soil layer is after improving its close degree, through take out to measure sampling the soil body average strength to reach to a 523 kPa（5.23 kgf/cm2）, really reach construction technical specification big is 2 strength targets in the 200 kPa（2 kgf/ cm2）, the manifestation double grid tube infuse syrup site to improve a work method in the flabbiness sticky in the soil layer make result good, also very suitable for of special geography make, there is the advantage of construction convenience, can for thereafter meet similar geology condition and geography environment factor reference use.