鲁东大学学报(自然科学版)

作为一种新型海上风机基础形式，砂土地基中加翼桩基础的承载机理尚不明确。本文开展物理模型试验，系统研究了加翼桩基础在不同荷载条件下的水平承载特性。通过单向静载试验，研究了翼片长度、翼片宽度、水平加载角度以及加载高度等对基础水平承载力的影响。通过位移控制双向循环加载试验，分析了加翼桩的荷载-位移滞回圈及其变形机理，进而开展了加翼桩循环后水平承载力的研究，并与对应的单向静载试验结果进行了对比。试验结果表明：加翼桩基础在单向静力加载下的水平承载力高于单桩基础；加翼桩基础水平承载力随着翼片尺寸的增大而增加，随着加载高度的增大而降低；水平加载角度45°工况下的承载力比0°工况略低；在双向循环加载试验中，加翼桩的荷载-位移滞回圈变化取决于桩周土挤密和桩体埋深损失效应的共同作用；循环后水平承载力都不低于相应的单向静载试验结果，并且加翼桩循环后水平承载力提高现象不如单桩显著；高频振动作用后承载力随着激振力水平的增加而提高。

As one novel type of foundations for offshore wind turbines, the bearing mechanism of the winged piles in sand remains unclear.Model tests were conducted to investigate the horizontal bearing characteristics of the winged piles under different loading conditions.The influences of wing length, wing width, horizontal loading angle, and loading height on the horizontal bearing capacity of the foundations were examined through unidirectional static loading tests.The load-displacement hysteresis loops and its deformation mechanisms were analyzed via the displacement-controlled bidirectional cyclic loading tests, and subsequently, the post-cyclic horizontal capacity of the piles was studied, and the results were compared with those of the corresponding unidirectional static loading tests.The test results are as follows.The horizontal bearing capacity of the winged piles under unidirectional static loading is higher than that of the monopile foundations.The horizontal capacity of the winged piles rises with the increase of the wing size and decreases with the increase in loading height.The bearing capacity at a loading angle of 45° is marginally lower than that at 0° loading angle.In the bidirectional cyclic loading tests, the variation of the load-displacement hysteresis loops of the winged pile is dependent on the combined effect of soil compaction around the pile and the loss of buried depth of the pile.The horizontal capacity after cycling is not lower than the corresponding unidirectional static load test results, and the increase in horizontal capacity after cycling of the winged piles is not as remarkable as that of the monopile foundations.The post-vibration bearing capacity exhibits a positive correlation with the excitation force amplitude.