本論文之研究目的為利用三向度有限元素分析軟體PLAXIS 3D分析扶壁在不同拆除時機下，使用不同方法處理，對連續壁變形的抑制效果。對於扶壁保留到最終開挖面，由於會遇到扶壁與筏式基礎施工界面複雜的問題，故提出一個新型扶壁拆除工法-GB工法。除了探討該工法各項參數對於抑制變位能力的影響外，也將其與先前的PCU扶壁拆除工法做比較，綜合出兩者差異與特性。隨挖隨拆工序方面，先分析T型扶壁翼板抑制變位機制並將其應用到與複數扶壁相接，藉由分析結果發現新增翼板對於抑制變位效果有大幅的提升，並且能夠達到與扶壁保留到最終開挖面相同的抑制變位能力，然後以此為基礎，設計出一種新型扶壁設置方式Type-D。針對Type-D的配置做相關參數研究並與等值面積R型長扶壁做比較，得出雖然對於抑制變位的能力並沒有R型長扶壁來的好，但是仍能提供相當程度的抑制效果，為另一種不需將扶壁延伸至開挖面中央的新型扶壁配置。

The purpose of this study is to use the three-dimensional finite element analysis software PLAXIS 3D to analyze the effect of reducing the deformation of diaphragm walls with buttress walls with different treatments. For buttress walls maintained during excavation, due to the complicated problem of the construction interface between buttress walls and the mat foundation, a new type of construction method named GB method is proposed. Influence of various parameters on the ability of restraining displacement is studied and the results are compared with the previous PCU method which is used to demolish buttress walls when excavation is down to the final excavation depth. Furthermore, this study analyzes the mechanism how the flange of T-shape buttress wall restrains the deformation, and then apply flanges to connect with buttress walls. It is found that adding the flange has a significant improvement in restraining the deformation, and it can achieve the same ability of restraining deformation as buttress walls is maintained to the final excavation stage. And then, based on this, a new type of buttress wall is designed. According to the research on the related parameters of the new type buttress wall configuration and comparison with the equivalent area rectangular buttress wall, it is concluded that although the ability to restrain the deformation is not as good as the rectangular buttress wall, it can still provide a considerable degree of restraint effect. This new buttress configuration does not need to extend the buttress wall to the center of the excavation.

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