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  • 學位論文

台北盆地景美層抽水試驗結果之研析

The Study of Pumping Test in Chingmei Deposits of Taipei Basin

指導教授 : 倪至寬

摘要


城市都會區地表使用空間日趨不足,致使人們竭盡所能朝地面下更深處爭取更多可利用的空間,以補地表空間不足之需求。近年來由於台北都會區大眾捷運系統的興建、工程開挖深度加深,除了處理松山層之水壓外亦需檢討對景美層之水壓,並加以控制,以防止開挖期間造成上舉破壞發生。由於景美層為礫石層之構造,其有高透水性之特性,是以地下水控制方法得當與否,直接影響工程之成敗。 本研究藉以台北捷運新莊線道岔段結構體41.5m深開挖及台北橋站結構體34m深開挖工程,來探討景美礫石層抽水特性分析、礫石層抽水穩定性分析、礫石層抽水沉陷分析、以及深基礎開挖抽水及穩定作業之研擬。 並依實際景美層抽降水試驗時之水位變化分析及抽降水時對深開挖基礎穩定之影響,進ㄧ步驗證所建立的分析方法、開挖面穩定工法及鄰產保護工法,並將抽降水試驗及現地實作數據建立成套資料,期能藉此資料提供未來規劃及設計人員決策及評估參考的依據。

並列摘要


Because of the shorting of the urban usable surface, people have to dig toward underground deeper and deeper in order to gain more available space. In Taipei urban area, recently, as a result of the deep excavation for building mass rapid transit system, the water pressure of both Songshan deposits and Chingmei deposits have to be controlled in order to avoid the occurring of uplift failure during the excavation period. Moreover, the most element of Chingmei bed is gravel, which also, with highly water-permeable. So the ways to control the water level directly affect the success for the whole construction. In this research article, we use the deep excavation for the structure of Taipei MRT Xinzhuang line’s Turn-out section at 41.5m and the structure of Taipei Bridge station at 34m to discuss the analysis of Chingmei gravel layer water pumping characteristic, stability and settlement. Also, according to the pumping test at the Chingmei deposits and the analysis of dewatering operation in deep excavation, we try to demonstrate the further method of working area stabilization and neighborhood protection. Moreover, we construct a set of data for this project, hoping to be the reference for planning and strategy in future.

參考文獻


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