We performed a series of small-scale physical modeling tests on two types of multiple ball-shaped nodular underreamed anchors under vertical uplift loading conditions using transparent soil and particle image velocimetry. Three sets of numerical investigations were also carried out to study the effect of anchor structure parameters on uplift bearing capacity. The results show that a larger ball diameter efficiently enhances ultimate bearing capacity, and the distance between two neighboring balls is closely associated with the bearing capacity of the ball 'shoulder' and shear resistance along the enlargement sides. An optimal design parameter is recommended to achieve the anchor's maximum ultimate bearing capacity.

我们使用透明土壤和颗粒图像测速仪，在垂直提升载荷条件下，对两种类型的多个球形球形欠扩锚进行了一系列的小型物理建模试验。还进行了三组数值研究，以研究锚结构参数对抗拔承载力的影响。结果表明，较大的球直径可以有效地提高极限承载力，并且两个相邻球之间的距离与球“肩”的承载力和沿扩大侧的抗剪力密切相关。建议使用最佳设计参数，以实现锚的最大极限承载力。