Numerical analysis of the interaction between composite-pile and slope and parameters optimization

Abstract Anti-slide pile is a retaining structure to improve a slope stability, with the advantages of clear force transfer system, simple construction and easy design. In order to maximize pile potential and slope self-bearing capacity, the FLAC3D software and site monitoring were conducted to analyze the interaction between composite-pile and the hydropower slope in Sichuan province. The results show that compared to the ordinary rigid anti‐slide pile, the composite rigid‐flexible anti‐slide pile is more effective in reducing the bending moment, shear force and lateral earth pressure of the pile with partly increasing horizontal displacement of the slope and the pile segment above the slip surface, each taking up 10%, 20%, 13%. The increase of the thickness of flexible material decreases the internal force of the pile finitely and cushion thickness with 40 cm and space of piles with 3m are optimal . The elasticity modulus of flexible material reduces its internal force of pile less than that of the rigid pile.