ABSTRACT
A study was conducted to assess the feasibility of implementing a bounding surface hypoplasticity model into the two-dimensional computer code FLAC. The requirements and procedures specified in the FLAC manual for a user-defined model were followed. The capability of the original model is implemented for plane strain conditions. The purpose of the study is to improve the simulation of variations in effective stress and of liquefaction of sands when using FLAC for the dynamic analysis of soil structures. The constitutive model is introduced. Sand behavior under shear loading is simulated up to the critical state. Shear-induced dilation and softening under undrained conditions are captured. Generation of pore water pressure, dilation, and liquefaction under cyclic loading are illustrated.
