Dynamic properties of polyurethane from resonant column tests for numerical GSI study

Abstract The paper focuses on the detailed analysis of dynamic characterisation polyurethane to evaluate effects injections into soil with aim geotechnical seismic isolation. To determine properties, resonant column (RC) tests were performed at University Kore Enna (Italy) specimens pure different values density and subjected mean confining pressures. results obtained by means RC tests, in terms shear modulus G damping ratio D as a function strain ? c , allowed develop an analytical formulation for G-? D-? curves, taking account linear relationship density, both maximum value max minimum min . derived from experimental is applied ground response analyses cohesive soils injected polyurethane, using finite element code. numerical show that reduce acceleration surface reduction varies thickness modified injections.