UCSD Liquefaction Model

The liquefaction model employed in Cyclic1D program is formulated within the framework of multi-yield-surface plasticity (see the figure below). In this model, emphasis is placed on controlling the magnitude of cycle-by-cycle permanent shear strain accumulation in clean medium to dense sands (Parra 1996, Yang 2000). Specifically, the experimentally observed accumulation of permanent shear strain was modeled by using strain-space parameters. Furthermore, appropriate loading-unloading flow rules were devised to reproduce the observed strong dilation tendency, and resulting increase in cyclic shear stiffness and strength.

A list of employed basic model parameters can be found at Model Parameters page. To learn more about the liquefaction model, see the Reference page for a list of relevant publications.