Numerical application of Plasticity to Geomechanics is an area of research that has grown rapidly since its origins in the late 1960s. This growth led to new methodologies and analysis approaches that are nowadays commonly employed in Geotechnical Engineering practice. Through the contribution of well-known scholars this book intends to provide an updated overview of some relevant developments and applications in this field. The topics covered in the various chapters of the volume can be summarised as follows: constitutive models for geomaterials, "damage" soil mechanics, non-linear consolidation, swelling soils, influence of the statistical variability of soil properties on the stability of slopes and foundations, numerical analysis of ground improvement techniques, tunneling problems.