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加鳍桩是一种通过在桩身设置侧鳍片或在桩端设置尾鳍片以提高单桩抗扭能力的新型桩形式。圆截面单桩通过桩–土界面摩阻力提供扭转反力,单桩承载力一般较低。加鳍桩通过鳍片挤压土体,从而提升单桩扭转承载力。大尺度模型试验结果表明,桩身增加鳍片使单桩扭转曲线由陡降型变为缓变型,其抗扭刚度和承载力均有显著提高,在3.6°扭转角时扭转反力提高4.7倍。采用数值方法分析加鳍桩在水平偏心加载1×2群桩中的应用效果,分析表明,加鳍桩通过显著减小群桩扭转变形降低了两基桩间内力差异,明显降低群桩中基桩的最大剪力和弯矩,降幅分别达30%和79%,有效提高群桩抵御偏心加载能力。
The finned pile is a new type of pile which is provided with side fins in the pile body or caudal fin at the pile end to improve the torsion resistance of the single pile. The circular section single pile provides the torsional reaction force through the pile-soil interface frictional resistance, and the bearing capacity of single pile is generally low. Finned pile through the fins squeeze soil, thereby enhancing the single pile torsion bearing capacity. The results of large-scale model tests show that the increase of fins makes the torsion curve change from steep drop to gradual change, and the torsional stiffness and bearing capacity of the pile increase significantly, and the torsional reaction force increases by 4.7 times at the twist angle of 3.6 ° . The numerical method is used to analyze the application effect of fin pile in horizontally eccentrically loaded 1 × 2 pile group. The results show that the fin pile can reduce the difference of internal forces between the two piles by significantly reducing the group torsion deformation, The maximum shear and bending moments of the pile decrease 30% and 79% respectively, which effectively improves the pile group’s resistance to eccentric loading.