Large-Scale Experimental Study on Collapsible Soil Improvement Using Encased Stone Columns

The aim of this study was to improve the characteristics natural collapsible soils using geogrid-encased stone column technique. For purpose, 20 large-scale specimens columns were prepared rigid metal cylinders with a diameter 308 mm and height 97 154 according unit cell theory. aspect ratio 10% 25%. occurrence bulging failure, considered six times diameter. encased geogrids varying stiffness from 80 200 kN/m. soil around inside compacted similar site conditions. Loading applied test, which determines collapsibility potential while being inundated bottom cylinder by water feeding system. During loading, vertical displacements measured at two locations on loading plate. results showed that settlement due inundation diminished increasing ratio. optimum approximately 15%. Encasement increased lateral pressure in prevented collapse column. values compared prediction model good agreement. data obtained can be used as practical method during inundation.