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.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Change history
01 September 2020
In the original version of the book, the following belated corrections are to be incorporated.
REFERENCES
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.
BS EN 14679 (2005). Execution of special geotechnical works – Deep Mixing, British Standards Institution.
CFEM (2006). Canadian Foundation Engineering Manual. 4th Edition, Canadian Geotechnical Society.
EXT (2017). Point Foundation - A foundation method for weak soil reinforcement using environmentally-friendly, highly functional binders. EXT’s Brochure in 2017.
Kitazume, M. and Terashi, M. (2013). The deep mixing method. CRC Press, 405 p.
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.
Poulos, H.G. and Davis, E.H. (1974). Elastic solutions for soil and rock mechanics. John Wiley and Sons, Inc.
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.
Zwillinger, D. (2018). CRC Standard mathematical stables and formulas. 33rd Edition, CRC Press, 858 p.
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.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Nguyen, T.D., Hoang, D.P., Tran, Q.G., Chung, S.G. (2020). Analytical and Numerical Analyses on Stiffness Enhancement of Ground Improved by Head-Enlarged CDM Columns. In: Duc Long, P., Dung, N. (eds) Geotechnics for Sustainable Infrastructure Development. Lecture Notes in Civil Engineering, vol 62. Springer, Singapore. https://doi.org/10.1007/978-981-15-2184-3_74
Download citation
DOI: https://doi.org/10.1007/978-981-15-2184-3_74
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-15-2183-6
Online ISBN: 978-981-15-2184-3
eBook Packages: EngineeringEngineering (R0)