Full-scale field test study on the load-bearing characteristics of inclined anchor short pile foundation

Abstract

The inclined anchor short pile foundation, a novel composite foundation, has the advantages of less earth excavation, small construction workload and less environmental damage. Full-scale field tests were conducted on inclined anchor short pile foundation, and the pile top load–displacement curves, loading capacity of the inclined anchors, failure modes and load distribution regularities are analyzed. Compared with a single pile, the bearing capacity was improved by 29.41% under individual uplift load and 18.52% under individual horizontal load, indicating that the inclined anchors can effectively share load and improve the overall bearing capacity of the foundation. However, compared with uplift-only loading, the bearing capacity is reduced under combined uplift and horizontal loading, suggesting that horizontal loads diminish the uplift bearing capacity of inclined anchor short pile foundations. The short piles and inclined anchors work in coordination, and the load gradually spreads from the short pile to the inclined anchors as the load increases. The failure mode was also related to the applied load form, as the failure phenomenon under combined load integrated the characteristics of individual uplift and horizontal loading modes. The research findings provide significant support for the design and implementation of inclined anchor short pile foundations.