Abstract The helical pile has been used to resist the tension for a long time. However, the prediction of the uplift capacity of helical piles including the influence of installation is still a challenge in design. Based on the change in stress according to Mohr-Coulomb failure criterion, a simple theoretical method has been developed, which can calculate the uplift capacity of shallow pre-embedded circular plate anchors and the uplift capacity of helical piles installed by torque and compression. In order to analyse the influence of installation process of a single-plate helical pile on its uplift capacity and verify the theoretical model, a series of model tests have been conducted in dense saturated sand. The single-plate helical piles with different out diameters of helixes have been installed with different installation speeds, and then, the single-plate helical piles have been moved up monotonically. The test results show that the installation speed and the size of the out diameter of the helix have significant influence on the uplift capacity of the helical piles, and the results of the theoretical method have a good fit with the test results. Using this simple theoretical method, the designer can easily predict the uplift capacities of helical piles, which includes the influence of installation.

中文翻译：

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浅层密砂单板螺旋桩抗拔能力包括安装影响

摘要 长期以来，螺旋桩用于抗拉。然而，包括安装影响在内的螺旋桩抗拔能力的预测仍然是设计中的一个挑战。根据Mohr-Coulomb破坏准则的应力变化，开发了一种简单的理论方法，可以计算浅层预埋圆板锚杆的抗拔能力和通过扭矩和压缩安装的螺旋桩的抗拔能力。为分析单板螺旋桩安装过程对其抗拔能力的影响并验证理论模型，在致密饱和砂土中进行了一系列模型试验。不同螺旋外径的单板螺旋桩以不同的安装速度安装，然后，单板螺旋桩单调向上移动。试验结果表明，安装速度和螺旋外径的大小对螺旋桩的抗拔能力有显着影响，理论方法的结果与试验结果吻合较好。使用这种简单的理论方法，设计人员可以轻松预测螺旋桩的抗拔能力，其中包括安装的影响。