Study on the bearing performance of all-steel spiral anchor in silty clay

Abstract The all-steel spiral anchor demonstrates exceptional advantages in terms of construction convenience and rapid deployment. To validate its Application in transmission engineering, an extensive field study was conducted to investigate the influence of inclination angle, buried depth, and anchor specifications on its load-bearing performance. The findings reveal that the load-bearing capacity of an individual anchor foundation is significantly influenced by these factors. Specifically, with a constant anchor rod burial length, an increase in the inclination angle leads to a relative decrease in the soil-embedded depth of the spiral anchor, thereby reducing its pull-out resistance. Furthermore, a direct correlation is evident between the pull-out resistance of spiral anchors and their embedment depth. Notably, changes in buried depth have minimal impact in the early stages of loading. However, as the load progressively increases, the force exerted on the anchor plate significantly escalates with displacement, resulting in a growing influence of embedment depth on the anchor’s load-bearing capacity. Enhancing the size and number of anchor components has been observed to have a favorable effect on the overall load-bearing capability of the anchor system. As displacement increases, upward displacement of the anchor plate compresses the surrounding soil, making the anchor plate’s contribution more pronounced and eventually surpassing that of the anchor rod.