Advertisement

Aanalytical and Numerical Analyses on Stiffness Enhancement of Ground Improved by Head-Enlarged CDM Columns

  • Tien Dung NguyenEmail author
  • Duy Phuong Hoang
  • Quynh Giao Tran
  • Sung Gyo Chung
Conference paper
Part of the Lecture Notes in Civil Engineering book series (LNCE, volume 62)

Abstract

This paper presents a comparative study on stiffness enhancement of grounds improved by an innovated CDM method (named Point Foundation (PF)) and by the conventional CDM method using analytical and numerical analyses. The stiffness enhancement is evaluated through induced settlement values under two examined shallow footing cases, of which one is ideally assumed and the other is an actual footing constructed. Results from both analytical analysis and numerical analysis, in which both elastic and elastic-perfectly plastic soil models are used, indicate that in general the PF method produces a more proper stiffness distribution with depth, which in turn results in smaller settlement values. Numerical analysis results also indicate that when only soil area under the footing is improved settlement of the footing is significantly larger than that on ground improved entirely, the case of theoretical elastic soil model. This is attributed to the influence of larger horizontal displacement around the footing.

Keywords

Ground improvement Settlement CDM method Analytical and numerical methods Plaxis 3D 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Notes

Acknowledgement

This work was supported by VJU Research Grant No. VJU.CS.18.02 and by EXT Co. Ltd. Sincere thanks to EXT for their kind permission to use information and some images of the PF method.

REFERENCES

  1. Bruce, M.E.C., Berg, R.R., Collin, J.G., Filz, G.M., Terashi, M. and Yang, D.S. (2013). FHWA design manual: Deep mixing for embankment and foundation support. FHWA Report No.: FHWA-HRT-13-046.Google Scholar
  2. BS EN 14679 (2005). Execution of special geotechnical works – Deep Mixing, British Standards Institution.Google Scholar
  3. CFEM (2006). Canadian Foundation Engineering Manual. 4th Edition, Canadian Geotechnical Society.Google Scholar
  4. EXT (2017). Point Foundation - A foundation method for weak soil reinforcement using environmentally-friendly, highly functional binders. EXT’s Brochure in 2017.Google Scholar
  5. Kitazume, M. and Terashi, M. (2013). The deep mixing method. CRC Press, 405 p.Google Scholar
  6. Nguyen, A.N., Nguyen, T.D., Lee, M.S. and Nguyen, D.K. (2019). Point foundation (PF) method for foundations and embankments. In the Proceedings of the 4th International Conference on Geotechnics for Sustainable Infrastructure Development, Hanoi, 28-29 November.Google Scholar
  7. Poulos, H.G. and Davis, E.H. (1974). Elastic solutions for soil and rock mechanics. John Wiley and Sons, Inc.Google Scholar
  8. Sabatini, P.J., Bachus, R.C., Mayne, P.W., Schneider, J.A. and Zettler, T.E. (2002). Geotechnical engineering circular No. 5 – Evaluation of soil and rock properties. U.S. Department of Transportation, Federal Highway Administration, Report No. FHWA-IF-02-034.Google Scholar
  9. Zwillinger, D. (2018). CRC Standard mathematical stables and formulas. 33rd Edition, CRC Press, 858 p.Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Tien Dung Nguyen
    • 1
    Email author
  • Duy Phuong Hoang
    • 1
  • Quynh Giao Tran
    • 1
  • Sung Gyo Chung
    • 2
  1. 1.VNU Vietnam-Japan UniversityHanoiVietnam
  2. 2.Dong-A UniversityBusanKorea

Personalised recommendations