Mechanism Analysis of the Box-Type Anti-Slide Pile with Vertical End-Curve-Arrangement Prestressed Tendons in Landslide Control

In this paper, a comparison analysis using FEM calculation was carried out regarding three kinds of anti-slide pile, i.e. the common one, the box-type reinforced concrete one and the box-type one with vertical prestressed tendons, showing that the displacement and positive bending moment of the pile with vertical prestressed tendons are smaller than that of the rest ones under 2000 kN landslide thrust, with slight increases of negative bending moment on both ends, indicating that it has obvious advantages in resisting displacement and bending during landslide control; on this basis, the layout patterns of the prestressed tendons were optimized by comparing the 5 types of layout option, and negative bending moment and shearing force of the box-type pile with vertical end-curve-arrangement prestressed tendons were found to be smaller than that of the rest ones, while the maximum positive bending moment and positive shearing force on the sliding surface remaining the same, proving that it is more scientific, reasonable and appropriate for landslide control; a loading simulation was conducted, showing that the prestress shall be applied appropriately. Combined with the inherent structure characteristics and internal vertical end-curve-arrangement prestressed tendons, the landslide stability is improved for box-type pile.