Element library - The nonlinear finite element scheme incorporated in Z_SOIL.PC uses 2D, 3D and axi-symmetric elements which optimally represent the nonlinear constitutive soil models and overcome locking phenomena often associated with incompressible and dilatant  behaviour. Structural elements complete the element library, including linear and nonlinear beams, with hinges, flexibility based nonlinear beams (allowing 1 element /beam), shells (including reinforced concrete), with possible hinges, membrane, geotextile,  reinforcement and cable behaviours. Finally, infinite media and a new frictional contact mortar and node to segment interface elements (permeable or impermeable ) are available for single or two-phase media. These elements offer the flexibility to model any configuration of the soil profile.