GEOTECHNICAL PARAMETERS OBTAINED WITH NONLINEAR COMPUTATIONAL MODELS USED IN GEOTECHNICAL ENGINEERING PROBLEMS

Abstract

Optimal designing of any type of soil works, slope stability analysis, the choice of the type of foundation and foundation design are directly dependent on the accuracy of the determination of geotechnical parameters of the soil. This paper presents the most important geotechnical parameters used in geotechnical engineering problems and also methods for determining the geotechnical parameters using the various computational models. The main computational models approached are: Mohr-Coulomb model, which relies on a line defined by the Coulomb failure stress and the stress circles of Mohr. The field of failure is given by the cohesion and internal friction angle. Another model approached is the Cam –Clay model. The central idea of the Cam-Clay model (Roscoe) or critical state model (Critical State Model MSM)is that the soils failure is described by a single failure surface (critical)in (q, p, s), limited critical state line (CSL). The paper also presents methods for determining the geotechnical parameters in the laboratory testing and also in situ testing.