Abstract
The quasi-three-dimensional FEM which has used for composite ground improved by sand columns is arranged for composite ground of ‘lattice form’ which is assemblied by walls of sand. The proposed method takes into account the drainage to walls of sand. The proposed method shows well the characteristics of latticed composite ground on some tests by unit element. Analyses for the both composite grounds which are ‘column form’ and ‘lattice form’ are performed by the proposed method. Consquently at low replacement factor of sand the undrained capacity of the latticed composite ground is larger than that of the columned one. Stress concentrated to sand during consolidation is considerably different between the both composite grounds. It is clarified that the latticed composite ground has the advantage of the dissipation of pore-water pressure.
