Experimental and numerical studies on the behavior and retaining mechanism of anchored stabilizing piles in landslides

摘要

Anchored stabilizing piles (ASPs) are now extensively applied as an effective method in landslide treatment, but systematic studies ASPs in landslides are still lacking. The behavior of the ASPs in landslide during progressive loading was analyzed through a 1:50 similitude ratio model test, including the earth pressure, bending moment, shear force, distributed load, and anchor tension. Furthermore, a validated numerical model by the model test results in terms of the pile bending moment, anchor tension, and earth pressures behind the pile was utilized to conduct a parametric study of ASPs, including the embedded lengths of the pile, initial prestress of the anchor, and number of anchor levels. The results show that the landslide thrust distribution behind the piles changes from a rectangular shape to a parabolic shape with a large top and a small bottom during landslide evolution. The maximum positive bending moment occurs near the sliding surface. The variations in maximum positive bending moment and anchor tension all show three distinct phases: stable, rapid growth, and slow increase. The combined retaining mechanism of the stabilizing piles and anchor can be summarized as follows: the landslide thrust is mainly carried by the pile initially, and the anchor tension is gradually mobilized with increasing earth pressure to share the landslide thrust together with the pile and transferred to stable bedrock to ensure the stability of the landslide. The findings of this work are helpful for verifying and improving the present design of ASPs in landslide treatment.