ABSTRACT In this study, the model tests were conducted on the short piles installed in sands under a horizontal pullout load to investigate their behavior characteristics. From the horizontal loading tests where dimensions of the pile diameter and length, and loading point were varied, the horizontal pullout resistance and the rotational and translational movement pattern of the pile were investigated. As a result, the horizontal pullout resistance of the pile embedded in sands was dependent on the pile length, diameter, loading point, etc. The ultimate horizontal pullout load tended to increase as the loading point (h/L) moved to the bottom from the top of the pile, regardless of the ratio between the pile length and diameter (L/D), reached the maximum value at the point of h/L = 0.75, and decreased afterwards. When the horizontal pullout load acted on the upper part above the middle of the pile, the pile rotated clockwise and moved to the pullout direction, and the pivot point of the pile was located at 150–360mm depth below the ground surface. On the other hand, when the horizontal pullout load acted on the lower part of the pile, the pile rotated counterclockwise and travelled horizontally, and the rotational angle was very small.
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机译：摘要在这项研究中，模型测试是在水平拉拔荷载下安装在沙子中的短桩上进行的，以研究其行为特性。通过改变桩直径和长度尺寸以及荷载点的水平荷载试验，研究了桩的水平抗拔力以及桩的旋转和平移运动方式。结果，埋在沙子中的桩的水平抗拔力取决于桩的长度，直径，荷载点等。随着荷载点（h / L）从底部移至底部，最终的水平抗拔荷载趋于增加。不论桩长与直径（L / D）之比如何，桩的顶部在h / L = 0.75时达到最大值，然后减小。当水平拉力作用在桩中部上方的上部时，桩顺时针旋转并向拉出方向移动，桩的枢轴点位于地面以下150-360mm的深度。另一方面，当水平拉力作用在桩的下部时，桩逆时针旋转并水平行进，旋转角非常小。
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