Performance of a geosynthetic-encased column (GEC) in soft ground: numerical and analytical studies

ABSTRACT: Stone columns with granular material are often used to support embankments over soft soil. In extremely soft soils, encasing the granular column with geosynthetic material improves their stiffness and strength. Based on the soil and column properties, settlements and stresses can be determined by means of analytical solutions or numerical analyses, and this paper compares the results of these two procedures by means of parametric analyses. Two-dimensional finite-element analysis (FEA) was used to simulate the behavior of a geosynthetic-encased stone column in soft clay loaded by an embankment. Parametric studies are then carried out by varying the thickness of the soft soil layer and the tensile stiffness of the geosynthetic encasement for a given set of soft clay and column parameters. The results of FEA have shown that the influence of the geosynthetic encasement on settlement improvement increases in shallow soft soil layers. It was also observed that the dependence of stress concentration on...

[1]  C. Yoo,et al.  Numerical modeling of geosynthetic-encased stone column-reinforced ground , 2009 .

[2]  K. Rajagopal,et al.  Studies on the Behavior of Single and Group of Geosynthetic Encased Stone Columns , 2010 .

[3]  S. N. Malarvizhi,et al.  COMPARATIVE STUDY ON THE BEHAVIOR OF ENCASED STONE COLUMN AND CONVENTIONAL STONE COLUMN , 2007 .

[4]  Yung-Shan Hong.  Performance of encased granular columns considering shear-induced volumetric dilation of the fill material , 2012 .

[5]  M Raithel,et al.  Calculation Models For Dam Foundations With Geotextile Coated Sand Columns , 2000 .

[7]  Abbas Soroush,et al.  3D numerical analyses of geosynthetic encased stone columns , 2012 .

[8]  Chung-Sik Yoo,et al.  Performance of Geosynthetic-Encased Stone Columns in Embankment Construction: Numerical Investigation , 2010 .

[9]  Boštjan Pulko,et al.  Geosynthetic-encased stone columns: Analytical calculation model , 2011 .

[10]  K. Rajagopal,et al.  Geosynthetic-encased stone columns: Numerical evaluation , 2006 .

[11]  César Sagaseta,et al.  Deformation and consolidation around encased stone columns , 2011 .

[12]  Dimiter Alexiew,et al.  Geotextile Encased Columns (GEC): Load Capacity, Geotextile Selection and Pre-Design Graphs , 2005 .

[13]  Abdelmalek Bouazza,et al.  Improvement of soft soils using geogrid encased stone columns , 2009 .

[14]  Majid Khabbazian,et al.  Numerical study of the effect of geosynthetic encasement on the behaviour of granular columns , 2010 .

[15]  K. Rajagopal,et al.  Model tests on geosynthetic-encased stone columns , 2007 .

[16]  Tao Li,et al.  Theoretical elastic solutions for foundations improved by geosynthetic-encased columns , 2011 .

[17]  C. Yoo,et al.  Performance of geogrid-encased stone columns in soft ground: full-scale load tests , 2012 .

[18]  Renato Pinto da Cunha,et al.  Behaviour of geosynthetic-encased granular columns in porous collapsible soil , 2009 .

[19]  Chung-Sik Yoo,et al.  Short- and Long-term Load Carrying Capacity of Geogrid-encased Stone Column - A numerical investigation , 2007 .

[20]  J. T. Shahu,et al.  Model tests on geosynthetic-reinforced stone columns: a comparative study , 2012 .

[21]  James K. Mitchell,et al.  Performance of a Stone Column Foundation , 1985 .

[22]  D. H. Gray,et al.  Mechanics of Fiber Reinforcement in Sand , 1983 .

[23]  P. W. Rowe,et al.  Importance of Free Ends in Triaxial Testing , 1964 .