EVALUATION OF LIQUEFACTION RESISTANCE AND DEFORMATION CHARACTERISTIC AFTER CYCLIC SHEAR LOADING OF IMPROVED SAND BY PERMEABLE GROUTING METHOD

Abstract

In this study, the liquefaction resistance and deformation characteristic after cyclic shear loading were tested by element tests for the improved sand by the permeable grouting method. The liquefaction resistance of improved sand, which has peculiar ductility, was evaluated by use of the reduction of shear modulus and the cumulative dissipation energy obtained by a strain-controlled test instead of a traditional stress-controlled test. The deformation characteristic after cyclic shear loading was evaluated by the residual strain obtained by a re-consolidation test and an undrained triaxial compression test after cyclic shear loading. In addition, the effectiveness of permeable grouting method against to earthquake loading was confirmed by an on-line testing, It is found that the occurrence of liquefaction and redidual deformation of improved sand after cyclic shear loading are restrained by improvement of permeable grouting.