Double-row anti-sliding piles: Analysis based on a spatial framework structure

Since the single-row anti-sliding piles could not able to provide an efficient bracing structure under larger sliding-force, the double-row anti-sliding piles, which have the advantages of less displacement in the top of the piles and large anti-force, can be used to reduce the pile deformation. However, the existing calculation models of double-row piles ignored the interaction features of piles, beams and soils, and the calculation results based on the models are not accurate enough. In this paper, a spatial force model of the double-row anti-sliding piles was presented. When taking double-row anti-sliding piles as a single-layer multi-span frame affected by piles, beams and soils, the spatial synergetics interaction between top ring beam and linking beam, as well as the affection of soil-arch on the frame were analyzed. A deformation equation was established according to pile border condition, continuous deformation, static force balance and deformation coordination relationship between top ring beam and pile. An analysis program was developed on the basis of FEM and the theory of Winkler Elastic Foundation Beam. Finally, the model was applied in the practice of Three-Gorge Reservoir Prevention and Treatment project, and the result shows it is suitable for similar engineering.