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Geotechnical and Geological Engineering

, Volume 35, Issue 1, pp 355–364 | Cite as

Undrained Vertical Bearing Capacity Factors for Ring Shallow Footings

  • Sadok Benmebarek
  • Insaf Saifi
  • Naima Benmebarek
Original Paper
  • 192 Downloads

Abstract

In this paper, numerical computations using FLAC code are carried out to evaluate the effects of both the ratio of internal radius to external radius ‘r i /r o ’ of the ring footing and the embedment ratios up to unity on the undrained bearing capacity factor ‘\(N_{c}^{\prime }\)’ for different roughness conditions. It is observed that for both smooth and rough surface ring footings, hardly any reduction occurs in the value of \(N_{c}^{\prime }\) with an increase in the ratio r i /r o up to 0.25. Whereas for r i /r o  > 0.25, the values of \(N_{c}^{\prime }\) decrease significantly with increasing r i /r o . However, for embedded ring footing with rough sides, the results indicate that the bearing capacity difference between circular and ring footings decreases with increase of the embedment depth. For instance, for r i /r o  = 0.5, the difference vanishes completely for embedment ratio >0.5. The results from the analysis compare reasonably well with available theoretical data from the literature.

Keywords

Numerical modeling Ring footing Bearing capacity Clay Failure 

References

  1. Benmebarek S, Remadna M, Benmebarek N, Belounar L (2012) Numerical evaluation of the bearing capacity factor of ring footings. Comput Geotech 44:132–138CrossRefGoogle Scholar
  2. Boushehrian JH, Hataf N (2003) Experimental and numerical investigation of the bearing capacity of model circular and ring footings on reinforced sand. Geotext Geomembr 21:241–256CrossRefGoogle Scholar
  3. Choobbasti AJ, Hesami S, Najafi A, Pirzadeh S, Farrokhzad F, Zahmatkesh A (2010) Numerical evaluation of bearing capacity and settlement of ring footing, case study of Kazeroon cooling towers. Int J Res Rev Appl Sci 4(3):263–271Google Scholar
  4. Cox AD, Eason G, Hopkins HG (1961) Axially symmetric plastic deformations in soils. Philos Trans R Soc Lond Ser A1036:1–45CrossRefGoogle Scholar
  5. Eason G, Shield RT (1960) The plastic indentation of a semi-infinite solid by a perfectly rough circular punch. Z Angrew Math Phys 11:33–43CrossRefGoogle Scholar
  6. FLAC (2007) Fast lagrangian analysis of continua. Itasca Consulting Group Inc, MinneapolisGoogle Scholar
  7. Gourvenec SM, Mana DSK (2011) Undrained vertical bearing capacity factors for shallow foundations. Géotech Lett 1:101–108CrossRefGoogle Scholar
  8. Houlsby GT, Martin CM (2003) Undrained bearing capacity factors for conical footings on clay. Geotechnique 53(5):513–520CrossRefGoogle Scholar
  9. Hu Y, Randolph MF, Watson PG (1999) Bearing response of skirted foundations on non-homogeneous soil. J Geotech Geoenviron Eng 125(12):924–935CrossRefGoogle Scholar
  10. Kumar J, Chakraborty M (2015) Bearing capacity factors for ring foundations. J Geotech Geoenviron Eng 141(10):06015007CrossRefGoogle Scholar
  11. Kumar J, Ghosh P (2005) Bearing capacity factor Nγ for ring footings using the method of characteristics. Can Geotech J 42:1474–1484CrossRefGoogle Scholar
  12. Saha MC (1978) Ultimate bearing capacity of ring footings on sand. M.Eng. thesis. UP, University of Roorkee, IndiaGoogle Scholar
  13. Saran S, Bhandari NM, Al-Smadi MMA (2003) Analysis of eccentrically–obliquely loaded ring footings on sand. Ind Geotech J 33(4):422–446Google Scholar
  14. Shaiu JS, Merifield RS, Lyamin AV, Sloan SW (2011) Undrained stability of footings on slopes. J Geotech Geoenviron Eng 11:3891–3900Google Scholar
  15. Yun G, Bransby MF (2007) The horizontal-moment capacity of embedded foundations in undrained soil. Can Geotech J 44:409–424CrossRefGoogle Scholar
  16. Zhao L, Wang JH (2008) Vertical bearing capacity for ring footings. Comput Geotech 35(2):292–304CrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Sadok Benmebarek
    • 1
  • Insaf Saifi
    • 1
  • Naima Benmebarek
    • 1
  1. 1.NMISSI Laboratory, Civil Engineering and Hydraulic DepartmentBiskra UniversityBiskraAlgeria

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