過去許多開挖之研究大都只進行二維且不考量鄰近結構物的自由場(Greenfield)開挖分析，並藉其自由場分析結果評估開挖引致之鄰房損害潛勢。然而實際之開挖工程為三維空間作業，其鄰房變形量與自由場地表沉陷量之間必然有一定之差異。因此，本研究之目的為探討三維開挖引致地盤反應與不同基礎型式之鄰房變形行為。
本研究採用解耦分析方法(DAM) 探討連續基腳與獨立基腳型式之低樓層梁柱構架校舍結構物受開挖引致之地盤反應與鄰房損害潛勢。兩種基礎型式之鄰房各考量4個不同位置。研究結果顯示兩種基礎型式之鄰房受開挖引致之基腳垂直位移量均大於鄰房位置對應的自由場沉陷量。鄰房基腳水平位移量因繫梁之束制效果而較為均勻，而連續基腳又有底部基礎板之束制，其基腳水平位移量更較獨立基腳平均。鄰房於開挖區相同位置時，獨立基腳之損害潛勢均較連續基腳嚴重。位於沉陷下凹區之鄰房受開挖引致的結構變形與塑性鉸數量均較其他鄰房位置嚴重，損害主要由角變量造成。不論連續基腳座落之位置為何，其側向應變皆相當小，係因連續基礎板之側向束制力導致。而獨立基腳位在上拱區時會產生較大側向應變，進而對鄰房造成損害。本研究亦綜合分析結果，嘗試建立鄰房基腳角變量與結構反應之關係，以供工程應用參考。

Most of the deep excavation analyses in the past were conducted in two dimensional condition. And adjacent building damage potential were usually only evaluated by greenfield results. However, real excavation work is a three dimensional problem and the ground settlement with adjacent building is different from the greenfield settlement. Therefore, the aims of this research is to study 3D excavation-induced ground responses and building deformation of different footing types.
The excavation-induced ground response and building damage potential are studied by using Decouple Analysis Method (DAM). The adjacent building is a typical low-rise framed school building supported by two different footing types, including spread footing and continuous footing. Four building positions are analyzed for each type of footing. The analytical results show that the footing vertical displacements are larger than the greenfield settlements at the same position, regardless of the footing type. The footing horizontal movements are relatively uniform due to the effect of the tie-beam. And continuous footing horizontal movements are more uniform than the spread footing due to the constraint of its continuous plate. At the same distance from the excavation, the damage potential of the building with spread footings is more severe than the building with continuous footings. The building located in the sagging zone is more vulnerable to damage and plastic hinge formation than buildings at other positions, mainly due to angular distortion. Regardless of the position of continuous footing, its lateral strain is small due to its continuous plate. Building with spread footing located in the hogging zone exhibits significant lateral strain and causes building damage. This study also summarized the analytical results and established the relationship between the bay angular distortion and structural response for engineering application.

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