本文使用三維非線性含水之有限元素分析，以Biot多孔介質理論為基礎，土壤之非線性有效應力分析是以Pacheco的孔隙水壓模式配合帽蓋模式來模擬，對橋墩樁基礎座落在飽和砂質土時進行研究。
分析顯示:橋墩樁基的設置，比較原無墩基土層在樁帽底部土壤孔隙水壓較原土層上升快。而斜樁角度愈大時墩頂水平向變位會隨之減小軸向變位則差異小，但各樁應力均會增加。且橋墩樁基礎整體與土壤互制產生的變位，會比墩基應變產生之變位重要等...。

The nonlinearity of soil is assumed to follow the cap model, and the pore pressure model based on cap model, proposed by Pacheco, adopted to simulate the built-up of the pore pressure. The finite-element modeling about bridge pile foundation has been structural. From the analysis, the pore pressure is go up more quickly than the ground without pile foundation. And the bigger angle of pile decreased the top of horizontal displacement of the bridge pier, but increased the pile press (include inside pile and outside pile).

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