Constitutive Model for Cemented Quick Clay in Deep-Mix Stabilization

Based on experimental results of a laboratory study on lime and cement stabilized quick clay, carried out at NTNU, Norway, a two yield surface constitutive model has been formulated. The model reproduces the mechanical behavior of the stabilized soil in the p’-q stress space. In the stress space the two yield surfaces appear as a “cap” and a “wedge” respectively. The formulated model “QUICKSTAB” has satisfactorily been able to simulate the overall geomechanical behaviour of stabilized quick clay and it agrees very well with the results established by the laboratory study. Typical model parameter values are also presented herein for various soil-binder mixtures. An extensive parametric study has been recommended to thoroughly explain the behavior of the model, including tests following different stress paths and extension of the study to include anisotropic cap-surface.