Numerical Modeling of the Effect of Partial Penetration of Vertical Drains on the Consolidation Process, Case Study: Preloading of Sarbandar Decanter Units in Khoozestan

Document Type : Research Article

Authors

1 Associate Professor, Department of Civil and Environmental Engineering, Amirkabir University of Technology

2 Former MSc student, Department of Civil and Environmental Engineering, Amirkabir University of Technology

Abstract

The most important factor in soil preloading is the consolidation time. In any cases, if installation depth of the vertical drain is less than the design depth (which is equal to the thickness of the compressible layer), a delay of the consolidation process will occur. In this paper, effect of this parameter on consolidation time is determined by numerical modeling and then a case study (soil preloading project of Sarbandar decanter units in Khoozestan) is studied. In some areas in this project, the penetrating depth of vertical drains is less than the expected design depth. Comparison has been made between numerical modeling and data from field instrumentation could be done.
It is concluded that if the penetrating depth of vertical drains is more than 80% of the compressible layer thickness, the delay in the consolidation process seems to be negligible.

Keywords

References

[1]گزارش مرحله اول پروژه پیش بارگذاری مخازن و واحد تصفیه خانه سربندر، شرکت مهندسین مشاور ژئومحیط پارس، 1388 .
[2] Moseley, M. P.; "Ground Improvement, Blackie Academic and Professional", An Imprint of Chapman
and Hall, 2000.
[3] Indraratna, B.; and Rujikiatkamjorn, C.; "Effects of Partially Penetrating Prefabricated Vertical Drains
and Loading Patterns on Vacuum Consolidation",GeoCongress 2008, New Orleans, ASCE Special Publication 178 (Geosustainability and Geohazard Mitigation, Eds: K. R Reddy, M. V. Khire, A. N.Alshawabkeh), pp. 596-603, 2008.
[4] Hibbit; Karlsson; and Sorenson; "ABAQUS Standard User’s Manual", Published by HKS Inc., 2004.
[5] Barron, R. A.; "Consolidation of Fine-Grained Soils by Drain Wells", Trans. ASCE No. 2346, pp. 718-754,
1948.
[6] Carillo, N.; "Simple Two-and Three Dimensional Cases in the Theory of Consolidation of Soils",
Journal of Mathematics and Physics, Vol. 21, No. 1,pp. 1-5, 1942.
[7] Roscoe, K. H.; Schofield, A. N.; and Worth, C. P.; "On the Yielding of Soils", Geotechnique 8, pp. 22-53,
1958.
[8] Rixner J. J.; Kraemer S. R.; and Smith A. D.;"Prefabricated Vertical Drains", Vol. 1-3: Summary
of Research Report: Final Report, Federal Highway Administration, Washington DC, Report No. FHWARD-
86/169, 1986..
Amirkabir Journal of Civil Engineering
Volume 48, Issue 2
September 2016
Pages 121-128

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