本研究針對台北市區一處設有大量扶壁、獨立式壁樁及扶壁式壁樁之開挖案例進行現地監測與三向度數值分析，以了解扶壁式壁樁於開挖階段與承載上部結構載重階段之行為。在釐清扶壁式壁樁與獨立式壁樁之土壤結構互制行為之後，本研究進行一系列之參數研究，改變不同影響因子對於扶壁式壁樁抑制壁體變形、承受結構載重作用之行為。
研究結果顯示不同壁樁型式中扶壁式壁樁有效地抑制壁體變形量，但在開挖時會受到扶壁段側推力影響，使壁樁樁頂產生較大之側向位移量，因此進行扶壁式壁樁之參數研究後，獲得最有效抑制壁體變位及樁頂側向位移量為之扶壁式壁樁長度為8~12m加上考量現地柱位位置間距為6~12m樁頂沉陷量較小且開挖完成後樁頂上浮量也較小，另外改變扶壁式壁樁厚度、壁樁段長度、貫入硬土層深度對於抑制壁體變形影響較小。最後以參數研究三維分析結果簡易換算成二維簡化分析使用之地盤反力係數-kv、kh。

This study focuses on an excavation cases in Taipei City. This case including a large number of buttress wall, individual barrette pile, and buttress wall combined with the barrette pile for three-dimensional numerical analysis. The key objective is to analyze the behavior of the buttress wall combined with barrette pile under the simultaneous impact of excavation and the load-bearing behavior of the superstructure.
After clarifying the soil-structure interaction behavior for various types of barrette piles, this study conducted a series of parametric studies on buttress walls combined with barrette piles. Parametric studies were conducted to investigate the impact of different variables on the deflection of the diaphragm wall deformation and its ability to bear the superstructure load.
The study's results indicate that buttress wall combined with barrette pile effectively reduces the diaphragm wall deformation. However, it's also influenced by the lateral force of the buttress wall section leading to a larger lateral displacement of the barrette pile top when excavation. Therefore, based on the parametric studies of buttress wall combined with the barrette piles, it is recommended that the most effective length for the piles be 8-12 meters with a spacing of 6-12 meters, taking into account the location of the existing columns.
In addition, varying the thickness of the buttress wall combined with barrette piles, the length of the barrette pile section and the depth of penetration into the hard soil layer have less effect on the deflection of the diaphragm wall deformation. Finally, the results of the three-dimensional analysis were easily converted to the simplified two-dimensional analysis of the soil reaction coefficients - kv and kh.

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