REINFORCED STONE COLUMN: REMEDIAL OF ORDINARY STONE COLUMN

Ordinary stone column is one of the ground improvement techniques for deep soil strata in view of their proven performance, short time schedule, durability, constructability and low costs. The technique may not be suitable for soft soil having undrained shear strength less than or equal 15 kPa due to excessive bulging, and also the soft clay squeezed into the voids of the aggregate. In these situations, the strength and stiffness of the stone column can be enhanced by encasing the individual stone column with a suitable geosynthetic. This contribution, reports on small scale model tests for short time loading condition on column foundation, with special analysis of the bearing and deformation behaviour of geotextile-coated sand column under static loading. Numerical analysis for long time loading condition (Embankment loading) is also analysed.