Torsional capacities of shaft piles with fins are experimentally examined. For comparison, model experimental tests were performed on conventional piles without such fins to investigate the behaviour of fin piles on the torsional capacity under diverse parameters. The influence of such fins, which are constructed at the top of the shaft with various values of width and length, was investigated. The test results elucidated that the fin efficiency of torsional capacities of fin piles ameliorates with the increase both of fin width/pile diameter ratio (W_f/D_p) and sand relative density. The adopted fins of the shaft play a vital function in its torsional capacity. This is thought to be because the section modulus of a fin pile shaft is augmented at the top of the shaft owing to the presence of fins, which lead to a soil–pile–fins interaction. In addition, augmenting the fin width will provide an appreciably higher soil resistance and a stiffer performance due to an augmentation of the passive zone of earth pressure in front of the shaft compared with conventional piles. This leads to amelioration in the torsional capacity for fin piles.

中文翻译：

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干砂中受扭转载荷的翅片桩性能

对带翅片的竖井桩的抗扭能力进行了实验检验。为了进行比较，对没有这种翅片的传统桩进行了模型实验测试，以研究翅片桩在不同参数下的抗扭能力行为。研究了这种在竖井顶部构造的具有不同宽度和长度值的翅片的影响。试验结果表明，翅片桩抗扭能力的翅片效率随着翅片宽度/桩径比（W _f / D _p) 和沙子的相对密度。轴采用的翅片对其抗扭能力起着至关重要的作用。这被认为是因为翅片桩轴的截面模量由于翅片的存在而在轴的顶部增加，这导致土-桩-翅片相互作用。此外，与传统桩相比，增加翅片宽度将提供明显更高的土壤阻力和更硬的性能，这是由于竖井前方土压力被动区的增加。这导致翅片桩的抗扭能力得到改善。