Analysis of Soil Disturbance Associated with Mandrel-Driven Prefabricated Vertical Drains Using an Elliptical Cavity Expansion Theory
Publication: International Journal of Geomechanics
Volume 10, Issue 2
Abstract
The installation of mandrel-driven prefabricated vertical drains and resulting disturbance of soft saturated clays are analyzed with a new elliptical cavity expansion theory. This formulated theory accounts for a concentric progression of elliptical cavities in an undrained condition and the large-strain effects in the plastic zone incorporating the modified Cam clay parameters. The total and effective stresses and excess pore water pressure in the soils surrounding the mandrel are predicted taking into account the mandrel installation rate, mandrel dimensions and the time factor. The theoretical variation of excess pore pressure is then compared with the results of large-scale consolidometer tests, which show that the estimated and measured pore pressures are almost the same. The plastic shear strain normalized by the rigidity index is then used to identify the zone of disturbance around the vertical drains. This formulation has been applied to a case history from the Muar clay region in Malaysia, and the results verify the usefulness of the method for determining the extent of the smear zone.
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References
Basu, D., Basu, P., and Prezzi, M. (2006). “Analytical solutions for consolidation aided by vertical drains.” Geomech. Geoeng., 1(1), 63–71.
Bo, M. W., Chu, J., Low, B. K., and Choa, V. (2003). Soil improvement: Prefabricated vertical drain techniques, Thomson Learning, Singapore.
Cao, L. F., Teh, C. I., and Chang, M. F. (2001). “Undrained cavity expansion in modified Cam clay I: Theoretical analysis.” Geotechnique, 51(4), 232–334.
Chai, J. C., and Miura, N. (1999). “Investigation of factors affecting vertical drain behavior.” J. Geotech. Geoenviron. Eng., 125(3), 216–226.
Choa, V., Bo, M. W., and Chu, J. (2001). “Soil improvement works for Changi East reclamation project.” Ground Improv., 5(4), 141–153.
Collins, I. F., and Stimpson, J. R. (1994). “Similarity solutions for drained and undrained cavity expansions in soils.” Geotechnique, 44(1), 21–34.
Collins, I. F., and Yu, H. S. (1996). “Undrained cavity expansions in critical state soils.” Int. J. Numer. Analyt. Meth. Geomech., 20, 489–516.
Hird, C. C., and Moseley, V. J. (2000). “Model study of seepage in smear zones around vertical drains in layered soil.” Geotechnique, 50(1), 89–97.
Holtz, R. D. (1987). “Preloading with prefabricated vertical strip drains.” Geotext. Geomembr., 6, 109–131.
Houlsby, G. T., and Withers, N. J. (1988). “Analysis of the cone pressuremeter test in clay.” Geotechnique, 38(4), 575–587.
Indraratna, B., Bamunawita, C., Redana, I. W., and McIntosh, G. (2003). “Modelling of prefabricated vertical drains in soft clay and evaluation of their effectiveness in practice.” Ground Improv., 7(3), 127–137.
Indraratna, B., and Chu, J. (2005). Ground improvement—Case histories, Vol. 3, Elsevier Science, U.K.
Indraratna, B., and Redana, I. W. (1998). “Laboratory determination of smear zone due to vertical drain installation.” J. Geotech. Geoenviron. Eng., 124(2), 180–184.
Indraratna, B., and Redana, I. W. (2000). “Numerical modelling of vertical drains with smear and well resistance installed in soft clay.” Can. Geotech. J., 37, 132–145.
Indraratna, B., Sathananthan, I., Bamunawita, C., and Balasubramaniam, A. S. (2005). “Theoretical and numerical perspectives and field observations for the design and performance evaluation of embankments constructed on soft marine clay.” Elsevier geo-engineering book series, Vol. 3, Elsevier Science, U.K., 51–89.
Karunaratne, G. P., et al. (2003). “Installation stress in prefabricated vertical drains.” J. Geotech. Geoenviron. Eng., 129(9), 858–860.
Onoue, A., Ting, N., Germaine, J. T., Whitman, R. V., and Mori, N. (1991). “Smear zone around a drain pile and well resistance of drains.” Proc., Geo-Coast Conf., Coastal Development Institute of Technology, Japan.
Prevost, J. H., and Hoeg, K. (1975). “Analysis of pressuremeter in strain softening soil.” J. Geotech. Engrg. Div., 101(GT8), 717–732.
Sathananthan, I. (2005). “Modelling of vertical drains with smear installed in soft clay.” Ph.D. thesis, School of Civil, Mining and Environmental Engineering, Faculty of Engineering, Univ. of Wollongong, New South Wales, Australia.
Sathananthan, I., and Indraratna, B. (2006). “Laboratory evaluation of smear zone and correlation between permeability and moisture content.” J. Geotech. Geoenviron. Eng., 132(7), 942–945.
Sharma, J. S., and Xiao, D. (2000). “Characterisation of a smear zone around vertical drains by large-scale laboratory tests.” Can. Geotech. J., 37, 1265–1271.
Small, J. C., Booker, J. R., and Davis, E. H. (1976). “Elasto-plastic consolidation of soil.” Int. J. Solids Struct., 12, 431–448.
Terzaghi, K. (1923). “Die Berechnung der Durchlässigkeitsziffer des Tones aus dem Verlauf der hydrodynamischem Spannungserscheinungen.” Sitz Akad. Wissen., Wien Math-Naturw Kl. Abt. IIa, 132, 105–124 (in German).
Wood, D. M. (1990). Soil behaviour and critical state soil mechanics, Cambridge University Press, Cambridge, U.K.
Zhu, G., and Yin, J. (2000). “Finite element analysis of consolidation of soils with vertical drain.” Int. J. Numer. Analyt. Meth. Geomech., 24(4), 337–366.
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Published In
International Journal of Geomechanics
Volume 10 • Issue 2 • April 2010
Pages: 53 - 64
Copyright
© 2010 ASCE.
History
Received: Dec 8, 2008
Accepted: Jul 27, 2009
Published online: Aug 19, 2009
Published in print: Apr 2010
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