A non-associative bounding surface plasticity model for marine sands

The phenomenon of seabed liquefaction during ocean storm has been recognized, which may exert damaging influences to the coastal and offshore installations. To study problems associated with seafloor instability, a constitutive model for marine sand is formulated within the general framework of bounding surface plasticity. One feature of this model is the vanishing yield surface for stress reversal processes. The model is relatively simple, yet capable of simulating marine sand behaviour under various loading conditions either monotonic or cyclic, in particular, under rotational shear. The importance of principal stress rotation in practice is related to seabed loading conditions occurred under ocean wave propagation. A comparison of model predictions and test results is presented.