Vertical Drain Depth Optimization in Vacuum and Surcharge Preloading Using Finite Element Method

Document Type : Original Article

Authors

1 Estahban azad university, estahban , Iran

2 M.Sc. student, Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran

3 Associate professor water division Shiraz university , Shiraz , Iran

4 Estahban branch islamic azad university, shiraz, Iran

Abstract

One of the most challenging parts of every project including prefabricated vertical drains (PVDs) combined with vacuum and surcharge preloading for ground improvement is the determination of the PVDs depth of installation and its configuration. In this paper Finite element was used for modeling and verification of a full-scale test embankment (TV2) which was constructed to study the effectiveness of PVDs combined with vacuum preloading for accelerating the consolidation along with surcharge at Bangkok airport. Different depths and scenarios were modeled and the results were compared and analyzed. Since the ultimate goal of soft clay soils treatment is attaining pre-determined settlement, the settlement curve under soil embankment was used for investigation of the results. A new Finite Element Modeling (FEM) based procedure as "One and Between Configuration" has been introduced. Based on the results, it was shown that; 1) the inward forces of vacuum preloading in proposed configuration is greater than the conventional method and lateral displacement reduced by 15 percent; 2) As a result of the lesser penetration of the mid PVD, the disturbance of the soil and accordingly, the smear zone becomes lesser; 3) Because of the "one and between" installation, in a case that a percentage of the every PVDs become clogged in any possible length, which may vary from PVD to PVD, the overall performance of the PVD itself, and in relation to adjacent PVDs don’t diminish as much as common constant penetration method.

Keywords

Main Subjects

Copyright © 2023 Mohammad Mehdi Pardsouie. This is an open access paper distributed under the Creative Commons Attribution License. Journal of Civil Engineering and Materials Application is published by Pendar Pub; Journal p-ISSN 2676-332X; Journal e-ISSN 2588-2880.

References

[1] B. Indraratna, Recent advances in the application of vertical drains and vacuum preloading in soft soil stabilisation,  (2010). [View at Google Scholar]; [View at Publisher].
[2] Indraratna B, Rujikiatkamjorn C. Effects of partially penetrating prefabricated vertical drains and loading patterns on vacuum consolidation. InGeoCongress 2008: Geosustainability and Geohazard Mitigation 2008 (pp. 596-603). [View at Google Scholar]; [View at Publisher].
[3] Pardsouie MM, Mokhberi M, Pardsouie MH, Kariminejad M. The comparison of the safety zone in the vicinity of marine clay treatment areas with and without surcharge and vacuum preloading. International Journal Of Coastal, Offshore And Environmental Engineering. 2023 May 1;8(2):13-20. [View at Google Scholar]; [View at Publisher].
[4] Pardsouie MM, Mokhberi M, Pardsouie MH, Ghate MR. The Necessity of Consideration of the Safe Distance for Infrastructures in the Vicinity of Weak Clay Soil Treatments Including Surcharge. New Approaches in Civil Engineering. 2023 May 22;7(1):47-55. [View at Google Scholar]; [View at Publisher].
[5] G. Holtan, Vacuum stabilization of subsoil beneath runway extension at Philadelphia International Airport, in:  Proc. of 6th ICSMFE, 1965. [View at Google Scholar]; [View at Publisher].
[6] V. Choa, Soil improvement works at Tianjin East Pier project, Southeast Asian Geotechnical Society, 1990. [View at Google Scholar]; [View at Publisher].
[7] Jacob A, Thevanayagam S, Kavazanjian E. Vacuum-assisted consolidation of a hydraulic landfill. InProceedings of the Conference on Vertical and Horizontal Deformations of Foundations and Embankments. Part 2 (of 2) 1994 Jan 1 (pp. 1249-1261). Publ by ASCE. [View at Google Scholar]; [View at Publisher].
[8] Bergado DT, Balasubramaniam AS, Fannin RJ, Holtz RD. Prefabricated vertical drains (PVDs) in soft Bangkok clay: a case study of the new Bangkok International Airport project. Canadian Geotechnical Journal. 2002 Apr 1;39(2):304-15. [View at Google Scholar]; [View at Publisher].
[9] Chu J, Yan SW, Yang H. Soil improvement by the vacuum preloading method for an oil storage station. Geotechnique. 2000 Dec;50(6):625-32.. [View at Google Scholar]; [View at Publisher].
[10] Yan SW, Chu J. Soil improvement for a road using the vacuum preloading method. Proceedings of the Institution of Civil Engineers-Ground Improvement. 2003 Oct;7(4):165-72. [View at Google Scholar]; [View at Publisher].
[11] Feng S, Bai W, Lei H, Song X, Liu W, Cheng X. Vacuum preloading combined with surcharge preloading method for consolidation of clay-slurry ground: A case study. Marine Georesources & Geotechnology. 2023 Feb 27:1-4. [View at Google Scholar]; [View at Publisher].
[12] Sun J, Lu M. Analytical solutions for consolidation of soft soil improved by air‐boosted vacuum preloading considering clogging effect. International Journal for Numerical and Analytical Methods in Geomechanics. 2023 Apr 24. [View at Google Scholar]; [View at Publisher].
[13] Indraratna B, Bamunawita C, Khabbaz H. Numerical modeling of vacuum preloading and field applications. Canadian Geotechnical Journal. 2004 Dec 1;41(6):1098-110. [View at Google Scholar]; [View at Publisher].
[14] M. Bo, J. Chu, B. Low, V.J.P.V.D.T. Choa, Soil improvement,  (2003) 111-141. [View at Publisher].
[15] Indraratna B, Rujikiatkamjorn C, Sathananthan I. Analytical and numerical solutions for a single vertical drain including the effects of vacuum preloading. Canadian Geotechnical Journal. 2005 Aug 1;42(4):994-1014. [View at Google Scholar]; [View at Publisher].
[16] Barron RA. Consolidation of fine-grained soils by drain wells by drain wells. Transactions of the American Society of Civil Engineers. 1948 Jan;113(1):718-42. [View at Google Scholar]; [View at Publisher].
[17] Hansbo S. Consolidation of clay by bandshaped prefabricated drains. Ground Engineering. 1979 Jul;12(5). [View at Google Scholar]; [View at Publisher].
[18] Onoue A. Consolidation by vertical drains taking well resistance and smear into consideration. Soils and Foundations. 1988 Dec 1;28(4):165-74. [View at Google Scholar]; [View at Publisher].
[19] Tarefder R, Zaman M, Lin DG, Bergado D. Finite element modeling of soft ground with PVD under vacuum and embankment preloading. International Journal of Geotechnical Engineering. 2009 Apr 1;3(2):233-49. [View at Google Scholar]; [View at Publisher].
[20] Shibata T, Murakami A, Fujii M. Prediction of embankment behavior of regulating reservoir with foundation improved by vacuum consolidation method. Soils and Foundations. 2014 Oct 1;54(5):938-54. [View at Google Scholar]; [View at Publisher].
[21] Sathananthan I, Indraratna B. Plane-strain lateral consolidation with non-Darcian flow. Canadian Geotechnical Journal. 2006 Feb 1;43(2):119-33. [View at Google Scholar]; [View at Publisher].
[22] Chai JC, Carter JP, Hayashi S. Ground deformation induced by vacuum consolidation. Journal of geotechnical and geoenvironmental engineering. 2005 Dec;131(12):1552-61. [View at Google Scholar]; [View at Publisher].
[23] Imai G. For the Further Development of" Vacuum-Induced Consolidation Method"-Present Understandings of Its Principle and Their Applications. InPROCEEDINGS-JAPAN SOCIETY OF CIVIL ENGINEERS 2005 (Vol. 798, p. 1). DOTOKU GAKKAI. [View at Google Scholar]; [View at Publisher].
[24] Pardsouie MM, Pardsouie MH. The effect of PVDs length on the lateral displacement of embankments. Geotechnical Geology. 2022 Jun 1;18(1):655-8. [View at Google Scholar]; [View at Publisher].
[25] Chai J, Carter JP. Deformation analysis in soft ground improvement. Springer Science & Business Media; 2011 Jul 14. [View at Google Scholar]; [View at Publisher].
[26] Chai JC, Miura N, Kirekawa T, Hino T. Optimum PVD installation depth for two-way drainage deposit. Geomechanics & engineering. 2009;1(3):179-91. [View at Google Scholar]; [View at Publisher].
[27] Sun HY, Wang J, Wang DF, Yu Y, Wei ZL. Optimal design of prefabricated vertical drain-improved soft ground considering uncertainties of soil parameters. J. Zhejiang Uni.-Sci. A. 2020 Jan 1;21(1):15-28. [View at Google Scholar]; [View at Publisher].
[28] N. Nghia, L. Lam, S.K.J.I.J.o.G. Shukla, G. Engineering, A new approach to solution for partially penetrated prefabricated vertical drains, 4(2) (2018) 1-17. [View at Google Scholar]; [View at Publisher].
[29] B. Indraratna, C. Rujikiatkamjorn, Predictions and Performances of Prefabricated Vertical Drain Stabilised Soft Clay Foundations,  (2006). [View at Google Scholar]; [View at Publisher].
[30] Indraratna B, Redana IW. Numerical modeling of vertical drains with smear and well resistance installed in soft clay. Canadian Geotechnical Journal. 2000 Feb 1;37(1):132-45. [View at Google Scholar]; [View at Publisher].
[31] Indraratna B, Rujikiatkamjorn C, Balasubramaniam AS, Wijeyakulasuriya V. Predictions and observations of soft clay foundations stabilized with geosynthetic drains and vacuum surcharge. InElsevier Geo-Engineering Book Series 2005 Jan 1 (Vol. 3, pp. 199-229). Elsevier. [View at Google Scholar]; [View at Publisher].
[32] Lam LG, Bergado DT, Hino T. PVD improvement of soft Bangkok clay with and without vacuum preloading using analytical and numerical analyses. Geotextiles and Geomembranes. 2015 Nov 1;43(6):547-57. [View at Google Scholar]; [View at Publisher].
[33] Pardsouie MM, Momeni M, Nasehi SA, Pardsouie MH. 2d numerical investigation of the effectiveness of surcharge and vacuum preloading along with pvds. In13th National Congress on Civil Engineering Isfahan University of Technology, Isfahan, IranAt: Isfahan, Iran, Esfahan, Iran 2022 (Vol. 5, p. 22). [View at Google Scholar]; [View at Publisher].
[34] Pardsouie MM, Pardsouie MH, Zomorodian SM, Mokhberi M. Numerical Study of efficiency of the Vacuum Preloading in Weak Clay Treatment (a case study). Journal of Civil Engineering & Materials Application. 2022 Jun 1;6(2). [View at Google Scholar]; [View at Publisher].
[35] Hird CC, Pyrah IC, Russel D. Finite element modelling of vertical drains beneath embankments on soft ground. Geotechnique. 1992 Sep;42(3):499-511. [View at Google Scholar]; [View at Publisher].
[36] Pardsouie MM, Mokhberi M, Pardsouie MH. The Importance of Incorporating Hydraulic Modifier Function versus Step Loading in Ground Improvements Including Vacuum Preloading. Advance Researches in Civil Engineering. 2022 Jun 1;4(2):54-60. [View at Google Scholar]; [View at Publisher].
[37] Marques ME, Leroueil S. Vacuum consolidation and vacuum consolidation with heating. InGround Improvement Case Histories 2015 Jan 1 (pp. 537-554). Butterworth-Heinemann. [View at Google Scholar]; [View at Publisher].
[38] Glendinning S, Jones CJ, Lamont-Black J. The use of electrokinetic geosynthetics (EKG) to improve soft soils. InElsevier Geo-Engineering Book Series 2005 Jan 1 (Vol. 3, pp. 997-1043). Elsevier. [View at Google Scholar]; [View at Publisher].
[39] Pardsouie MM, Mokhberi M, Pardsouie MH. Numerical Investigation Impact of the Spacing between Vertical Drains on the Diameter of the Influence Zone. Advance Researches in Civil Engineering. 2022 Sep 1;4(3):22-8. [View at Google Scholar]; [View at Publisher].
[40] Chai JC, Carter JP, Hayashi S. Ground deformation induced by vacuum consolidation. Journal of geotechnical and geoenvironmental engineering. 2005 Dec;131(12):1552-61. [View at Google Scholar]; [View at Publisher].
Journal of Civil Engineering and Materials Application
Volume 7, Issue 3
September 2023
Pages 139-150

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History

  • Receive Date: 02 May 2022
  • Revise Date: 10 July 2023
  • Accept Date: 21 August 2023

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