斜坡明挖邊坡滑動數值分析之研究

Numeric Analysis of Slope Stability at an Open Cut Slope

張世豪(Shih-Hao Chang)

指導教授 ： 倪至寬

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2011年)

摘要

台北都會區寸土寸金，土地利用效率高，建築物密度高，更鑑於大多數建築物基礎開挖皆緊鄰其他建物或地下公共管線等，考量台北盆地地質帶更軟弱黏土層，為避免開挖解壓、側向變位過大及地表沉陷等問題，造成鄰房傾斜或損毀，深開挖多以連續壁施工為優先選擇的工法，而於台北盆地內基礎開挖以斜坡明挖工法施工者，實為少見；本研究係以坐落於基隆河北側及大屯火山群南側基隆河一區(K1)之斜坡明挖工法開挖基礎為例，利用二維更限元素法分析程式PLAXIS與現地觀測資料進行比對分析及驗證。
利用上述分析比對結果，探討該案例岩盤深度之變化對開挖破壞面之影響，並以排樁貫入深度、地下水位位置及擋土設施位置為變數，透過二維更限元素法分析程式PLAXIS模擬各因子對土層滑動之影響，進一步探究其主控因子。

關鍵字

有限元素法 ； 深開挖 ； Cam-Clay Model

並列摘要

The staggering price of a property in urban Taipei results in high efficiency of land use and extreme density of buildings. In light of the proximity of the foundations of most buildings to other buildings or underground utility and considering the soft and weak clay underlying the geologic formation of Taipei Basin, diaphragm wall is the preferred construction method for deep excavations, as to prevent inclining of or damage to neighboring structures due to soil decompression, excessive lateral displacement or ground settlement. Open cut slope is rarely seen as the foundation excavation method of choice in Taipei Basin. An open cut slope excavation at a site located in the Keelung River K1 zone north of Keelung River and south of Tatun volcano group was studied. PLAXIS, a 2D finite element analysis program, was combined with jobsite observation data for comparison and verification.
With the comparison result mentioned above, the effects of changes in the depth of bedrock at the studied jobsite to the failure surface of the excavation were investigated. The predominant control factors were explored to find out the influence of these factors to the soil slide through the simulation of PLAXIS with the penetration depth of soldier piles, groundwater table and the location of strutting as the variables.

並列關鍵字

Finite Element Method ； Deep Excavation ； Cam-Clay Model

參考文獻

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