Numerical Analysis of Installation Effect of Single-helix Anchor on Uplift Capacity in Dense Sand
The purpose of this study is to investigate the deformation characteristics of the soil around the anchor during the installation process of a single helix anchor in dense sand and its impact on the uplift capacity,in order to provide technical support for the refined design of helix anchor foundations.A numerical calculation model for the installation and pull-out process of helix anchor in dense sand was established using MatDEM software.The micro mechanical parameters of particles were calibrated by comparing with indoor model test results.The installation effect and uplift capacity of helix anchors with different embedment depths and diameters under drilling and pre embedding installation methods were analyzed.When H/dw≤ 10,the ultimate uplift capacity of drilling installation is lower than that of pre embedded.When H/dw＞10,the difference in uplift capacity caused by the installation method no longer increases with the increase of embedment depth;As the diameter of the disc increases,the uplift capacity of the helix anchor under both installation methods shows an increasing trend.The decrease in Qut under the drilling method compared to the pre embedded Qup increased from 33％to 53％.The uplift capacity of the helix anchor under the pre embedded method is higher than that under the drilling installation method.The conclusion is that the uplift capacity of drilling and installing helix anchors is lower than that of pre embedded methods,but when the embedment depth ratio exceeds 10,the impact of installation disturbance on the uplift capacity changes little with depth;As the diameter of the disc increases,the impact of installation disturbance on the ultimate uplift capacity increases.Compared to the difference in installation disturbance caused by changes in embedment depth,the impact of diameter changes is more significant.
helical anchorinstallation effectuplift capacitydiscrete element methoddense sand
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