PSEUDO-3D ANALYSES METHOD OF FLOATING LATTICE-SHAPED CEMENT TREATMENT AND ITS APPLICABILITY FOR HORIZONTALLY-LAYERED GROUND

Abstract

 Lattice-shaped cement treatment by using the deep mixing method has been used as a liquefaction countermeasure. Floating lattice-shaped cement treatment is the method to reduce the improvement depth of it in terms of the economic pursuit of ground improvement. In this study, pseudo-3D analyses were carried out to simulate the seismic behavior of floating lattice-shaped cement treatment in the tests which were conducted for horizontally-layered ground. A Pseudo-3D analysis is the anlytical method modeling 3 dimensional lattice-shaped improvement ground by 2 dimensional analytical method. As a result, by floating lattice-shaped cement treatment, increase of excess pore water pressure of liquefiable soil was fairly constrained, and effectiveness of them was confirmed by the pseudo-3D analyses. Moreover the effect was confirmed in the case of broad range of ground by the analyses.