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通过离心模型试验对扭转群桩中的阴影效应进行研究。试验结果表明,受扭转荷载的大型群桩中存在着显著的阴影效应,导致群桩承载力的显著降低。阴影效应随着群桩布局和基桩位置不同而变化,1×2和2×2群桩中的阴影效应影响可以忽略;3×3群桩中阴影效应明显且边桩受到的影响比角桩大。可以用p乘子来定量表示扭转群桩中的阴影效应。在3×3扭转群桩中,角桩和边桩在松砂中的p乘子分别为0.55和0.35,在密砂中分别为0.40和0.35。提出了一个群桩扭转效率系数来评价群桩中不同效应对承载力的综合影响,3×3群桩在松砂和密砂中的效率系数分别为0.71和0.68,主要是受到该群桩中阴影效应的影响。
The shadow effect in the twisted pile was studied by centrifugal model test. The experimental results show that there is a significant shadow effect in the large group pile subjected to torsional load, resulting in a significant reduction of the bearing capacity of pile groups. The shadow effect changes with the layout of pile groups and the location of pile foundation. The shadow effect in 1 × 2 and 2 × 2 groups of pile groups can be neglected. The shadow effect in 3 × 3 pile group is obvious and the side pile is affected. Big. The p-multiplier can be used to quantify the shadow effect in a twisted group pile. In the 3 × 3 twisted group pile, the p-multipliers of angle piles and side piles in loose sand were 0.55 and 0.35, respectively, and 0.40 and 0.35 in sand. A group pile torsion efficiency coefficient was proposed to evaluate the comprehensive effect of different effects on the bearing capacity of pile groups. The efficiency coefficients of 3 × 3 pile group in loose sand and tight sand were 0.71 and 0.68, respectively, Shadow effect.