Numerical Analysis of Ring Beam's Spatial Effects in Retaining Structure with Double-Row Piles

The spatial effects of ring beams in retaining structure with double-row piles for a deep foundation were investigated. The software of FLAC3D was employed to study the tip displacements and moments of the piles at different locations in retaining structure with double-row piles and ring beams. Numerical results show that the tip displacements of pile at the corner are much less than the ones in the middle. The maximum tip displacement is located at the piles in the middle. Compared with the on-site measured data, above result match the test data very well. It is also found that the retaining structure with row piles has better synergistic reaction with ring beams. The deformation and internal force are affected by ring beams. The displacement and moment could also be limited by ring beams. Therefore, it is proposed that the spatial effect should be considered in the design of retaining structure with double-row piles.