Laboratory Determination of Smear Zone due to Vertical Drain Installation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 124, Issue 2
Abstract
This paper is mainly concerned with a laboratory study to investigate the effect of smear due to vertical drain installation. The extent of the smear zone around a vertical drain was studied utilizing a large-scale consolidometer apparatus. The test results reveal that a significant reduction in the horizontal permeability takes place toward the central drain, whereas the vertical permeability remains relatively unchanged. The radius of the smear zone was estimated to be a factor of four to five times the radius of the central drain (mandrel), and the measured ratio of horizontal to vertical permeability approached unity at the drain-soil interface. The laboratory measured settlements are subsequently compared with the predictions based on the theory of Hansbo and the finite element method. It is of relevance to note that the inclusion of the correct variation of permeability ratios of the smear zone in the plane strain finite element analysis improves the accuracy of settlement predictions.
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References
1.
Barron, R. A.(1948). “Consolidation of fine-grained soils by drain wells.”Trans., ASCE, 113, 718–742.
2.
Bergado, D. T., Asakami, H., Alfaro, M. C., and Balasubramaniam, A. S.(1991). “Smear effects of vertical drains on soft Bangkok clay.”J. Geotech. Engrg., ASCE, 117(10), 1509–1530.
3.
Hansbo, S.(1979). “Consolidation of clay by band shaped prefabricated drains.”Ground Engrg., 12(5), 16–25.
4.
Hansbo, S. (1981). “Consolidation of fine-grained soils by prefabricated drains.”Proc., 10th Int. Conf. on Soil Mech. and Found. Engrg., Publications Committee of ICSMFE, ed., A. A. Balkema, Rotterdam, The Netherlands, Vol. 3, 677–682.
5.
Hansbo, S. (1987). “Design aspects of vertical drains and lime column installation.”Proc., 9th Southeast Asian Geotech. Conf., Organizing Committee, SEAGS (ed.), Bangkok, Thailand, Vol. 2, section 8, 1–12.
6.
Indraratna, B., and Redana, I. W. (1995). “Large-scale, radial drainage consolidometer with central drain facility.”Australian Geomech., 2(December), 103–105.
7.
Indraratna, B., and Redana, I. W.(1997). “Plane strain modeling of smear effects associated with vertical drains.”J. Geotech. Engrg., ASCE, 123(5), 474–478.
8.
Roscoe, K. H., and Burland, J. B. (1968). “On the generalized stress strain behavior of wet clay.”Engineering plasticity. Cambridge University Press, Cambridge, U.K., 535–609.
9.
Shogaki, T., Moro, H., Masaharu, M., Kaneko, M., Kogure, K., and Sudho, T. (1995). “Effect of sample disturbance on consolidation parameters of anisotropic clays.”Proc., Int. Symp. on Compression and Consolidation of Clayey Soils. H. Yoshikuni and O. Kusakabe, eds., A. A. Balkema, Rotterdam, The Netherlands, Vol. 1, 561–566.
10.
Tavenas, F., Jean, P., and Leroueil, S. (1983a). “The permeability of natural soft clays, part 1: Methods of laboratory measurement.”Can. Geotech. J., 20(November), 629–644.
11.
Tavenas, F., Jean, P., and Leroueil, S. (1983b). “The permeability of natural soft clays, part 2: Permeability characteristics.”Can. Geotech. J., 20(November), 645–660.
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Copyright © 1998 American Society of Civil Engineers.
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Published online: Feb 1, 1998
Published in print: Feb 1998
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