Abstract: Due to its non-smooth geometry, rectangular piles often demonstrate the stress singularity in the numerical analysis. Using rounded corners to smooth the corners of rectangular piles can eliminate the stress singularity, but the size of the rounded corners has some effects on the reliability of the approximate model results. In this paper, a numerical model single rectangular pile is established by a commercial finite element method software ANSYS, the degree of influence of the round size on the reality of the finite element approximation result is analyzed. When the size of the rounded corners is, the overall displacement calculation result of the structure is reliable; When the size of the rounded corners is, the overall stress analysis result of the structure is reliable; Finally, the deformation of the rectangular pile used as an actual deep excavation project is simulated, and the simulation results are compared with the construction monitoring results to validate numerical results. It is concluded that, in the numerical analysis, rounding corners can effectively minimize the non-convergence problem caused by stress singularity. At the same time, selecting the appropriate size of the rounded corners according to the results of this paper can not only satisfy the accuracy of numerical analysis but also reduce the number of meshes.

Key words: Rectangular Piles, stress Singularity, Rounded Corner, ANSYS