ABSTRACT
This paper compares numerical simulation results to recordings from two (2) sets of dynamic centrifuge tests that emphasize on the lateral spreading response of a saturated sand layer during shaking, before and after passive stabilization against liquefaction with colloidal silica. The first cor-responds to the seismic response of a gently sloping sand layer, while the second to the seismic response of a pile group within a gently sloping sand layer. The former test shows significantly reduced horizontal displacements and settlements of the stabilized layer, while the latter test depicts smaller horizontal pile displacements, but also lower pile bending moments. These beneficial effects of stabilization are well reproduced by the simulations, which were obtained by employing the finite difference method and a constitutive model for sands named NTUA-SAND. The stabilization is simulated by reducing the pore fluid bulk modulus in the coupled analyses, thus simulating the seemingly increased compressibility of colloidal silica in the sand pores.
