Numerical Solution of Stone Column–Improved Soft Soil Considering Arching, Clogging, and Smear Effects
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 3
Abstract
Improvement of soft clay deposits by the installation of stone columns is one of the most popular techniques followed worldwide. The stone columns not only act as reinforcing material increasing the overall strength and stiffness of the compressible soft soil, but they also promote consolidation through effective drainage. The analytical and numerical solutions available for ascertaining the response of column-reinforced soil have been developed on the basis of the equal strain hypothesis. For typical surcharge (embankment) loading, the free strain analysis appears to give more realistic results comparable to field data. The paper presents a novel numerical model (finite-difference method) to analyze the response of stone column–reinforced soft soil under embankment loading, adopting the free strain approach and considering both arching and clogging effects. Apart from predicting the dissipation of excess pore water pressure and the resulting consolidation settlement with time, the load transfer mechanism and the extent of ground improvement are some of the salient features captured by the proposed model. The proposed model is validated by comparing with existing models and field data, which indicate the suitability and accuracy of the solutions. The proposed model is also applied successfully to selected case studies.
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Acknowledgments
The authors gratefully acknowledge the financial support received in the form of an Endeavour Postdoctoral Research Fellowship from the Department of Education, Environment and Workplace Relations (DEEWR), Australian Government, through Austraining International.
References
Abusharar, S. W., Zheng, J. J., Chen, B. B., and Yin, J. H. (2009). “A simplified method for analysis of a piled embankment reinforced with geosynthetics.” Geotextiles Geomembranes, 27(1), 39–52.
Adalier, K., and Elgamal, A. (2004). “Mitigation of liquefaction and associated ground deformations by stone columns.” Eng. Geol., 72(3–4), 275–291.
Alamgir, M., Miura, N., Poorooshasb, H. B., and Madhav, M. R. (1996). “Deformational analysis of soft ground reinforced by columnar inclusions.” Comput. Geotech., 18(4), 267–290.
Balaam, N. P., Poulos, H. G., and Brown, P. T. (1977). “Settlement analysis of soft clays reinforced with granular piles.” Proc., 5th Southeast Asian Conf. on Soil Engineering, Sponsor Southeast Asian Geotechnical Society, Bangkok, Thailand, 81–92.
Barksdale, R. D., and Bachus, R. C. (1983). “Design and construction of stone columns.” Rep. FHWA/RD-83/026, National Technical Information Service, Springfield, VA.
Barron, B. A. (1948). “Consolidation of fine grained soil by drain wells.” Trans. Am. Soc. Civ. Eng., 113(2346), 712–748.
Castro, J., and Sagaseta, C. (2009). “Consolidation around stone columns: Influence of column deformation.” Int. J. Numer. Anal. Methods Geomech., 33(7), 851–877.
Deb, K. (2010). “A mathematical model to study the soil arching effect in stone column-supported embankment resting on soft foundation soil.” Appl. Math. Model., 34(12), 3871–3883.
Ellouze, S., Bouassida, M., Hazzar, L., and Mroueh, H. (2010). “On settlement of stone column foundation by Priebe’s method.” Ground Improv., 163(GI2), 101–107.
Guetif, T., Bouassida, M., and Debats, J. M. (2007). “Improved soft clay characteristics due to stone column installation.” Comput. Geotech., 34(2), 104–111.
Hajra, M. G., Reddi, L. N., Glasgow, L. A., Xiao, M., and Lee, I. M. (2002). “Effects of ionic strength on fine particle clogging of soil filters.” J. Geotech. Geoenviron. Eng., 128(8), 631–639.
Han, J., and Ye, S. L. (2000). “Simplified method for consolidation rate of stone column reinforced foundations.” J. Geotech. Geoenviron. Eng., 127(7), 597–603.
Han, J., and Ye, S. L. (2002). “A theoretical solution for consolidation rates for stone column reinforced foundations accounting for smear and well resistance effects.” Int. J. Geomech., 2(2), 135–151.
Hansbo, S. (1981). “Consolidation by vertical drains.” Geotechnique, 31(1), 45–66.
Indraratna, B. (2009). “Recent advances in the application of vertical drains and vacuum preloading in soft clay stabilization.” Austral. Geomechan. J., 45(2), 1–44.
Indraratna, B., Balasubramaniam, A., and Balachandran, S. (1992). “Performance of test embankment constructed to failure on soft clay.” J. Geotech. Eng., 118(1), 12–33.
Indraratna, B., and Redana, I. W. (1997). “Plane strain modelling of smear effects associated with vertical drains.” J. Geotech. Eng., 123(5), 474–478.
Indraratna, B., and Redana, I. W. (1998). “Laboratory determination of smear zone due to vertical drain installation.” J. Geotech. Eng., 125(1), 96–99.
Kempfert, H. G. (2003). “Ground improvement methods with special emphasis on column-type techniques.” Int. Workshop on Geotechnics of Soft Soils–Theory and Practice, Taylor & Francis Group, New York, 101–112.
Khan, A. P., Madhav, M. R., and Reddy, E. S. (2010). “Consolidation of thick clay layer by radial flow—Nonlinear theory.” Geotech. Eng., 2(2), 157–160.
Lo, S. R., Zhang, R., and Mak, J. (2010). “Geosynthetic-encased stone columns in soft clay: A numerical study.” Geotextiles Geomembranes, 28(3), 292–302.
Lorenzo, G. A., and Bergado, D. T. (2003). “New consolidation equation for soil-cement pile improved ground.” Can. Geotech. J., 40(2), 265–275.
Low, B. K., Tang, S. K., and Choa, V. (1994). “Arching in piled embankments.” J. Geotech. Eng., 120(11), 1917–1938.
Malarvizhi, S. N., and Ilamparuthi, K. (2008). “Numerical analysis of encapsulated stone columns.” Proc., 12th Int. Conf. of IACMAG, Centre for Infrastructure Engineering and Safety, Sydney, Australia, 3719–3726.
Mays, D. C. (2010). “Contrasting clogging in granular media filters, soils, and dead-end membranes.” J. Environ. Eng., 136(5), 475–480.
Mitchell, J. K. (1981). “Soil improvement—State of the art report.” Proc., 10th ICSMFE, Vol. 4, Balkema, Rotterdam, Netherlands, 509–565.
Murugesan, S., and Rajagopal, K. (2010). “Studies on the behavior of single and group of geosynthetic encased stone columns.” J. Geotech. Geoenviron. Eng., 36(1), 129–139.
Oh, E. Y. N., et al. (2007). “Behaviour of a highway embankment on stone column improved estuarine clay.” Proc., 16th Southeast Asian Geotechnical Conf., Vol. 1, Southeast Asian Geotechnical Society, Bangkok, Thailand, 567–572.
Priebe, H. J. (1995). “The design of vibro replacement.” Ground Eng., 28(10), 31–37.
Raithel, M., Kirchner, A., Schade, C., and Leusink, E. (2005). “Foundation of constructions on very soft soils with geotextile encased columns: State of the art,” Geo-Frontiers 2005, Vol. 130–142, ASCE, Reston, VA, 1867–1877.
Reddi, L. N., Ming, X., Hajra, M. G., and Lee, I. M. (2000). “Permeability reduction of soil filters due to physical clogging.” J. Geotech. Geoenviron. Eng., 126(3), 236–246.
Terzaghi, K. (1943). Theoretical soil mechanics, Wiley, New York.
Umezaki, T., Ochiai, H., and Hayashi, S. (1993). “Undrained shear strength of clay during consolidation.” Proc., 11th Southeast Asian Geotechnical Conf., Southeast Asian Geotechnical Society, Bangkok, Thailand, 269–274.
Walker, R., and Indraratna, B. (2006). “Vertical drain consolidation with parabolic distribution of permeability in smear zone.” J. Geotech. Geoenviron. Eng., 132(7), 937–941.
Wang, G. (2009). “Consolidation of soft soil foundations reinforced by stone columns under time dependent loading.” J. Geotech. Geoenviron. Eng., 135(12), 1922–1931.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 139 • Issue 3 • March 2013
Pages: 377 - 394
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 21, 2010
Accepted: Jun 13, 2012
Published online: Aug 1, 2012
Published in print: Mar 1, 2013
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