Model Tests For Analysis of Load Carrying Capacity of Geogrid Encased Stone Column

Abstract

Stone column is one of the ground improvement systems that is used for accelerating consolidation and increasing bearing capacity for settlement sensitive structures like load embankments, bridge abutments, oil storage tanks etc. This method enhances ground bearing capacity, reduces settlement, prevent liquefaction and lateral ground movement. Recently, the geosynthetic reinforced(encased) stone column approach, which increase the confinement effect, has been developed to improve the load carrying capacity of stone column. Although such a concept has been successfully applied in practice, the fundamentals of the method have not been fully explored. This paper investigates the failure mechanism and load carrying capacity of the geogrid encased stone column by model tests. The results of the analyses indicated an improved bearing capacity of the geogrid encased stone column method over the conventional stone column method with no encasing. Also, the length of the geogrid encasement was found to be more effective for installation of the column within a length from the surface of about 2~4 column diameters. .