Volume 36, N. 2, May-August 2013 | PDF(1 downloads)
A numerical model to simulate the mechanical behavior of soils is presented in this first part of the present work.
This paper reports some advances obtained in the first stage of an ongoing research, which aims to develop a robust and
efficient algorithm for consolidation analyses of saturated/unsaturated soils. Hence, the present work is mainly concerned
with basic issues, such as efficiency of the finite element formulation and accuracy of the constitutive formulation. Since
geotechnical materials exhibit elastoplastic characteristics, the theory of plasticity is applied here by means of the critical
state concept using the Cam-Clay formulation. The constitutive equation is integrated using an explicit algorithm where
the strain increment is divided into a number of sub-steps defined automatically by the numerical scheme. Eight-node
hexahedral finite elements with one-point quadrature are employed in the spatial discretization of the geometrical domain.
In order to avoid excitation of spurious modes, an efficient hourglass control is utilized in conjunction with a corotational
formulation, which also contributes to the treatment of geometrical and physical nonlinearities.