Abstract: The role of pile cap in using the cantilever piles at the deep excavation supporting structure is evaluated by the finite element method. The following results are obtained: 1) the pile cap has a significant effect in controlling the excavation deformation at the longer side and presence of the pile cap makes the excavation induced deformation more compatible. 2) Since the pile cap increases the lateral stiffness at the top of piles so that the deformational characterization of the cantilever supporting structure has improved. 3) Better lateral deflections can be obtained by increasing the number of pile caps in the supporting system. 4) The smaller pacing between the pile caps, the larger bending moment in the pile; the greater number of pile caps, the larger the bending moment in the pile.

Key words: Deep Excavation, Pile Caps, Rare Piles, Finite Element Analysis Method, Cantilever Piles