Experimental Study of Single and Groups of Stone Columns Encased by Geotextile

Document Type : Research Article


Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran


Stone columns are one of soil improvement methods that helps to increase the bearing capacity of soft soils. Therefore, finding ways to enhance their workability can be considerable. Bulging, known as the most important columns failure, can be dealt with by using suitable encasements. In this paper, single and group of stone columns were studied with and without geotextile encasement. Single stone columns with diameters of 63 and 82 mm and length to diameter ratio of 5 were tested. Results showed that by using geotextile, the bearing capacity of columns increased. Also, stone columns were tested in groups and their bearing capacities are compared.


Main Subjects

[1] J.M.O. Huges, N.J. Withers, Reinforcing of cohesive soils with stone columns. Ground Eng, (1974) 7 (3) 42-49.
[2] M. Madhav, P. Vitkar, Strip footing on weak clay stabilized with a granular trench or pile. Canadian geotechnical journal, (1978) 15(4) 605-609.
[3] H. Aboshi, E. Ichimoto, K. Harada, M. Emoki, The composer—A method to improve the characteristics of soft clays by inclusion of large diameter sand columns. Proc., Int. Conf. on Soil Reinforcement. E.N.P.C., 1, Paris, (1979) 211–216.
[4] S. Murugesan, K. Rajagopal, Studies on the behaviour of single and group of geosynthetic encased stone columns. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 136(1) (2010) 129–139.
[5] V. Sivakumar, D. McKelvey, J. Graham, D. Hughes, Triaxial tests on model sand columns in clay. Canadian Geotechnical Journal, 41(2) (2004) 299–312.
[6] A. Ambily, S.R. Gandhi, Behavior of stone columns based on experimental and FEM analysis. Journal of geotechnical and geoenvironmental engineering, 133(4) (2007) 405-415.
[7] J. Gniel, A. Bouazza, Improvement of soft soils using geogrid encased stone columns. Geotextiles and Geomembranes, 27(3) (2009) 167-175.
[8] J. Castro, C. Sagaseta, Deformation and consolidation around encased stone columns. Geotextiles and Geomembranes, 29(3) (2011) 268-276.
[9] S.K. Dash, M.C. Bora, Improved performance of soft clay foundations using stone columns and geocellsand mattress. Geotextiles and Geomembranes, 41 (2013) 26-35.
[10] S.R. Mohapatra, IK. Rajagopa, J. sharma, Direct shear tests on geosynthetic-encased granular columns. Geotextiles and Geomembranes, 44(3) (2016) 396-405.
[11] MY. Fattah, KT. Shlash, MJM. Al-Waily, Stress concentration ratio of model stone columns in soft clays. Geotechnical Testing Journal, ASTM, 34(1) (2011) 1-11.
[12] H. Yung-Shan, W. Cho-Sen, Y. Yi-Sheng, Model tests on geotextile-encased granular columns under 1-g and undrained conditions. Geotextiles and Geomembranes, 44(1) (2016) 13-27.
[13] K. Ali, J.T. Shahu, K.G. Sharma, Model tests on geosynthetic-reinforced stone columns: a comparative study. Geosynthetic International, 19(4) (2012) 292-305.
[14] K. Ali, J.T. Shahu, K.G. Sharma, Model tests on single and groups of stone columns with different geosynthetic reinforcement arrangement. Geosynthetic International, 21(2) (2014) 103-118.
[15] J.F. Chen, L.Y. Li, J.F. Xue, S.Z. Feng, Failure mechanism of geosynthetic encased stone columns in soft soils under embankment. Geotextiles and Geomembranes, 43(5) (2015) 424-431.
[16] V. Sivakumar, DKNM. Jeludine, A. Bell, DT. Glyn, P. Mackinnon, The pressure distribution along stone columns in soft clay under consolidation and foundation loading. Geotechnique, 61(7) (2011) 613-620.
[17] CS. Wu, YS. Hong, Laboratory tests on geosynthetic encapsulated sand columns. Geotextiles and Geomembranes, 27 (2009) 107-120.
[18] SS. Najjar, S. Sadek, T. Maakaroun, Effect of sand columns on the undrained load response of soft clays. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 136(9) (2010) 1263-1277.
[19] BI. Kim, SH. Lee, Comparison of bearing capacity characteristics of sand and gravel compaction pile treated ground. KSCE Journal of Civil Engineering, 9(3) (2005) 197-203.
[20] A. Cimentada, A. Da Costa, J. Canizal, C. Sagaseta, Laboratory study on radial consolidation and deformation in clay reinforced with stone columns. Canadian Geotechnical Journal, 48 (2011) 36-52.
[21] M. Ghazavi, J.N. Afshar, Bearing capacity of geosynthetic encased stone columns. Geotextiles and Geomembranes, 38 (2013) 26-36.
[22] S. Lai, Similitude for shaking table tests on soil structure fluid models in 1g gravitational field. Soils and Foundations, 29(1) (1989) 105-118.