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本文之主要目的在于模拟海域之钢管单桩，以静态方法来探讨置入饱和砂土中之模型基桩承受扭力荷重之反应行为。研究分为两部分进行，一为实验研究：八根模型钢管桩或以打桩机打设于饱和砂土中，或以埋入方式埋置于饱和砂土中。采用静态方法之方式分析计算海域钢管单桩的承载力。另一研究为数值模拟，将基桩分为以内弹簧连接之集中质量，而基桩与土壤互制作用，则以Ｗｉｎｋｌｅｒ模型模拟。研究结果显示，海域钢管单桩，在相同长度下，长细比愈小其扭力承载力愈大。对相同长细比的单桩而言，具有开口桩趾之基桩较具有闭口桩趾之基桩有较大的承载力。一般而言，传递至砂土的扭力随着深度增加而增加，但对打击具有开口桩趾之基桩而言，则底部会相对减少，此说明传递至砂土的扭力是为土壤有效应力和基桩的函数，另基桩承受扭力荷重之反应行为，可由轴向荷重试验推得之，反之亦然。
The main purpose of this paper is to simulate the single steel tubular pile in the sea area and to investigate the reaction behavior of the model pile subjected to saturated sand to bear the torsional load by the static method. The study is divided into two parts. One is experimental study. Eight steel pipe piles are laid in saturated sand or piled in saturated sand. Static method is adopted to analyze and calculate the bearing capacity of steel pipe single pile in sea area. The other study is numerical simulation, which divides the pile into the concentrated mass connected by the inner spring, while the interaction between the pile and the soil is simulated by Winkler model. The results show that the single steel pipe pile in the sea area, under the same length, the smaller the slenderness ratio is, the larger the torsional bearing capacity is. For a single pile with the same slenderness ratio, the pile with open pile toe has greater bearing capacity than the pile with closed pile toe. In general, the torque delivered to the sand increases with depth, but at the base of the pile with the open toe, the bottom will be relatively reduced, indicating that the torque transmitted to the sand is the soil effective stress and The function of the pile and the response behavior of the pile to the torsional load can be deduced from the axial load test and vice versa.