台灣自921地震災害後，歷經象神、桃芝、納莉、利奇馬及敏督利等颱風侵襲，各大河川長期受到砂石超量開採，致使河川原始地貌破壞造成河流主洪線的改道及河床高程嚴重下降。近年來，大部分位於河川中下游段之橋樑橋墩裸露在洪流沖刷之中的四處可見，亦有多起因基樁裸露或損壞而造成橋樑損壞之案例。
　　本研究嘗試利用p-y曲線法與現地基樁全尺寸試驗進行比對與驗證，然後對受到沖刷的群樁基礎進行側向載重的模擬，以p-y曲線法理論為背景，利用GROUP群樁分析程式來進行模擬與分析。針對台一線高屏大橋新建工程四種不同的橋墩型式與東西快速公路北門玉井線新建工程中，兩種不同橋墩型式，在不同的沖刷深度(0m~10m)，基樁承受不同側向載重所產生的側向位移，並根據日本道路橋示方書所訂定的樁頭位移作為標準，建立基樁樁頭位移潛感分級準則，使用套裝軟體MATLAB建立一基樁潛感分級程式，將台一線高屏大橋新建工程中四種不同的橋墩型式整合起來，讓使用者可以透過簡單的GUI介面，掌握基樁承受側向載重後的行為。

　　The environment of the rivers in Taiwan has been destroyed by natural hazards and man-made abuses. In the recent years, there are some examples of the bridge damages caused by pile foundations exposing in the rivers.
　　The “p-y curves” theory has been developed to analyze the pile behavior under lateral loading for many years. The special purpose programs such as GROUP 5.0 is adopted to study the susceptibility classification of bridge foundation. In this study, the pile cap displacement of group piles under lateral loading was analyzed by numerical simulation. Totally four types of bridge piers in the Gao-Ping River Bridge and two types in the highway construction project of the Bei-Men Yu-Jing at the southern Taiwan were taken as examples to simulate the scouring of bridge foundation, and their lateral displacements were calculated under the lateral loads. The interaction behaviors of pile with different depths under various lateral loadings were discussed herein. According to the preliminary study of on the susceptibility classification of pile caps displacement, a standard of susceptibility classification of pile caps displacement chart can be constructed. There is a program which has been developed in this study to integrate four types of bridge piers in the Gao-Ping River Bridge. The program is developed using PC software MATLAB for users to realize the behavior of piles by graphical user interfaces.

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