Experimental evaluation of stress concentration ratio of model stone columns strengthened by additives Available to Purchase

The main objective of this paper is to find an experimental base for the value of the stress concentration ratio by manufacturing a model of a single stone column with rigid instrumented loading plates such that the total load applied to the model footing, and the load applied to the stone column can be measured alone. Model tests of soil treated with a single stone column and groups of two, three and four stone columns were tested. In addition, model tests were prepared with 10% cement as additive to backfill material for the columns. The backfill material was also modified by mixing 30% sand by weight with 70% crushed stone. It was found that the addition of the sand to the crushed stone indicated a marginal effect on stress concentration ratio in soil of shear strength cu  =  12 kPa, but no clear effect was noticed during addition of sand to stone in treated soil having a shear strength cu  =  6 kPa.