本研究主要以地基反力法分析基樁受側向力作用於線性反應下之行為，並研擬求取樁頭變位之簡易分析法，以簡單的計算步驟代替傳統的求解方法，且將簡易法以圖表方式呈現，讓使用者不需使用電腦程式運算便能以查圖方式快速估算側向荷重樁於層狀土層中之樁頭變位。
另一研究主題為探討樁頂或樁底存在軟弱或堅硬土層對樁頭位移之影響，將此樁頂或樁底之異質土層其厚度及勁度的變化對樁頭位移的影響量做討論，而樁頂存在軟弱或堅硬土層的分析可應用於避免軟弱表層造成樁頭位移過大的情形發生，並建議地盤改良之範圍使其以最有效率之方式降低樁頭位移。
為探討本研究中線性反應分析之適用範圍，將於最後以試驗案例用線性反應分析並與試驗數據做比較，討論線性反應於實際情形之應用狀況。
由分析結果所得之結論可簡述如下：(1)簡易分析法對於計算現地參數範圍的樁頭位移有良好的成效，僅有極少數誤差量大的情形產生，但仍在可接受的範圍內。(2)與樁頂土層對樁頭變位的影響相比，樁底土層對樁頭變位的影響量不大，而樁頂的軟弱土層對於樁頭的變位有極大的影響且可能導致變位過大而危害上部結構。(3)當樁所受側向荷重在基樁極限承載力的三分之一範圍內時，可採用線性反應分析來預測樁頭位移量。

This study is aimed to analyze the behavior of laterally loaded pile under linear responses based on subgrade reaction method, and to develop the simplified method for estimating pile head deflection by presenting with graphics. The simplified method, which estimates the head deflection of laterally loaded pile in layered soil system by graphic method, will omit the calculations of computer program.
Another object of this study is to discuss the effect of surface or bottom layer of soft or stiff soil on pile head deflection of laterally loaded pile. The influence of surface or bottom layer is evaluated by changing the thickness and stiffness , and to avoid large magnitude of deflection caused by laterally loaded pile in soil system with soft surface layer, the range of ground improvement to reduce the pile head deflection is suggested.
To study the application scope of the analysis under linear responses, the experimental data is compared with the linear analysis to evaluate the application limitation of linear response in practice.
The conclusions of this study are as follow：(1) Simplified method has good achievement for estimating pile head deflection in simulating field parameters, only few conditions has larger error but still acceptable. (2) The influence of surface layer is much more important than bottom layer at pile head deflection on laterally loaded pile, and the soft surface layer has great effect under lateral loading and may produce large deflection which will cause the upper structure failure. (3) The pile head deflection using linear analysis will be acceptable if the loading is under one-third of the ultimate load.

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