Geotechnical and Geological Engineering

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

Undrained Vertical Bearing Capacity Factors for Ring Shallow Footings

Original Paper
First Online:
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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 
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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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