UBC3D liquefaction verification model

i HAVE MANY QUESTION : 2-Is damping ratio is important ,its zero in the model ? 3-iS THE BOUNDRY VISCOUS IN pLAXIS 3d IS ACCUARATE AS TIED FREDOM IN pLAXIS 2d ?
verification of liquefaction of ubc3d at plaxis 3D

Dears I want a verification example for Liquefaction model for Ubcmodel at plaxis 3d cause the results not accuracy with the resullts of plaxis 2D cause the boundary condition can u help me ? THe...