大直径加翼单桩水平承载性能离心模型试验研究

CENTRIFUGE MODEL TESTS ON HORIZONTAL BEARING CAPACITY OF A LARGE DIAMETER PILE WITH WINGS

采用离心模型试验,研究近海风电场风机基础中的大直径单桩及加翼单桩的承载机制。加翼单桩是基于近海风电场常见的单桩基础,为进一步利用近地表浅层土的土抗力,在泥面下加装稳定翼钢板的新型基础型式。共开展9组离心模型试验,研究不同翼板的尺寸参数(宽度、长度)和埋深以及加载高度条件下加翼单桩的水平承载力。试验结果表明,翼板的设置可以明显增强单桩的水平承载力,增强的幅度与翼板的尺寸参数及埋深有关。研究成果为指导加翼单桩的设计和施工提供了可靠的试验依据。

Single large diameter pile is widely used in the offshore wind turbine. The wings are added to the large diameter pile in order to fully use the resistance of shallow soil. The bearing mechanisms of the single large diameter pile with and without wings were studied through centrifuge tests. Nine centrifuge tests were conducted for the sake of studying the horizontal bearing capacity of the large diameter pile with wings. The horizontal bearing capacity of the pile with the wings of different sizes,embedded depths and different loading conditions were investigated. The tests results show that the horizontal bearing capacity of the large diameter pile with wings is much greater than that without wings. The magnitude of the enhancement of the horizontal bearing capacity relates to the size and the depth of embedment of the wings.