Numerical Analysis of Model Pile Failure Due to Soil Movement Using FLAG~(3D)

摘要

Three-dimensional (3D) analyses, using the finite difference program FLAC~(3D), were carried out to study the behaviour of single model pile failure due to soil movement ("Passive" pile). The comparisons of numerical predictions and experimental results were made for load-displacement (P-y) curves and the ultimate soil pressure p_u for a single model pile embedded into soft clay. Parametric study included mesh refinement, constitutive soil model, interface model, and solution method. The Drucker-Prager and Mohr-Coulomb constitutive models were employed to model the non-linear stress-strain soil behaviour. The pile was assumed to feature linear elastic behaviour. The ultimate soil pressure obtained from the FLAC~(3D) was 9.8c_u to 11.5c_u (where, c_u is the undrained shear strength) and agrees well with experimental results and predictions from other researchers.