Effect of Changing of Dilation Angle and the Cohesion of Clayey Soil on Stone Column

Abstract — Stone columns have been used as an effective technique for improving the engineering behaviour of soft clayey grounds and loose silt deposits. The soil improvement via stone columns are achieved from accelerating the consolidation of weak soil due to shortened drainage path, increasing the load carrying capacity and / or settlement reduction due to inclusion of stronger granular material. The research describes the results of numerical simulations investigating the installation effects of stone columns in natural soft clay. The geometry of the problem is simplified to axial symmetry, considering the installation of one column only. A parametric study is carried out to investigate the behavior of stone columns in different conditions. Different parameters were studied to show their effect on the bearing improvement and settlement reduction of the stone column. In this modeling, the effects of dilation angle and cohesion of the soil on the load settlement curve and the settlement ratio (SR) have been paid