Comparison of response of 2 × 2 pile group predicted by Von-Mises and Drucker-Prager criteria.

Pile group with 2 × 2 configuration, subjected to lateral load is analyzed using three dimensional finite element model. In house program is developed in FORTRAN. Pile and pile cap is modeled using 20 node elements whereas soil is modeled using 8 node elements. Interface elements are having 16 nodes. The interface is modeled such that the gapping between the pile and adjacent soil is not allowed but the slipping is allowed. The nonlinear behavior of soil is modeled using the Von-Mises criterion and Drucker Prager (inner) criterion. The parametric study revealed the influence of pile spacing, soil modulus, and pile length to diameter ratio on the lateral displacement of pile group and the maximum bending moment. The results predicted by both criteria are compared. The trends shown by the results predicted by both criteria during the parametric study are similar. However, the results predicted by the Von-Mises criterion are higher than Drucker Prager (inner) criterion. [ABSTRACT FROM AUTHOR]