Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Pressure-settlement behavior of square and rectangular skirted footings resting on sand

  • Khatri, Vishwas Nandkishor (Department of Civil Engineering, Indian Institute of Technology (Indian School of Mines)) ;
  • Debbarma, S.P. (Department of Civil Engineering, National Institute of Technology) ;
  • Dutta, Rakesh Kumar (Department of Civil Engineering, National Institute of Technology) ;
  • Mohanty, Bijayananda (Department of Civil Engineering, National Institute of Technology)
  • Received : 2015.09.06
  • Accepted : 2016.12.31
  • Published : 2017.04.25
⟨ Previous Next ⟩

Abstract

The present study deals with the Pressure-settlement behavior of square and rectangular skirted footing resting on sand and subjected to a vertical load through a laboratory experimental study. A series of load tests were conducted in the model test tank to evaluate the improvement in pressure-settlement behavior and bearing capacity of square and rectangular model footings with and without structural skirt. The footing of width 5 cm and 6 cm and length/width ratio of 1 and 2 was used. The relative density of sand was maintained at 30%, 50%, 70%, and 87% respectively. The depth of skirt was varied from 0.25 B to 1.0 B. All the tests were carried out using a strain controlled loading frame of 50 kN capacity. The strain rate for all test was kept 0.24 mm/min. The results of present study reveal that, the use of structural skirt improves the bearing capacity of footing significantly. The improvement in bearing capacity was observed almost linearly proportional to the depth of skirt. The improvement in bearing capacity of skirted footings over footing without skirt was observed in the range of 33.3% to 68.5%, 68.9% to 127% and 146.7% to 262% for a skirt depth of 0.25 B, 0.50 B and 1.0 B respectively. The skirted footings were found more effective for sand at relative density of 30% and 50% than at relative density of 70% and 87%. The bearing capacity was found to increase linearly with footing width for footings with and without skirts. This observation was found to be consistent for footings with different skirt depths and for relative density of sand i.e., 30%, 50%, 70%, and 87%. The obtained results from the study for footing with and without skirts were comparable with available solutions from literature.

Keywords

References

  1. Al-Aghbari, M.Y. (2007), "Settlement of shallow circular foundations with structural skirts resting on sand", J. Eng. Res., 4(1), 11-16. https://doi.org/10.24200/tjer.vol4iss1pp11-16
  2. Al-Aghbari, M.Y. and Dutta, R.K. (2008), "Performance of square footing with structural skirt resting on sand", Geomech. Geoeng., 3(4), 271-277. https://doi.org/10.1080/17486020802509393
  3. Al-Aghbari, M.Y. and Mohamedzein, Y.E-A. (2004), "Bearing capacity of strip foundations with structural skirts", Geotech. Geol. Eng., 22(1), 43-57. https://doi.org/10.1023/B:GEGE.0000013997.79473.e0
  4. Binquet, J. and Lee, K.L. (1975), "Bearing capacity analysis of reinforced earth slabs", J. Geotech. Eng., 101(GT12), 1257-1275.
  5. Bolton, M.D. (1986), "Strength and dilatancy of sands", Geotechnique, 36(1), 65-78. https://doi.org/10.1680/geot.1986.36.1.65
  6. Bransby, M.F. and Randolph, M.F. (1998), "Combined loading of skirted foundation", Geotechnique, 48(5), 637-655. https://doi.org/10.1680/geot.1998.48.5.637
  7. Eid, H.T. (2013), "Bearing capacity and settlement of skirted shallow foundations on sand", Int. J. Geomech., 13(5), 645-652. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000237
  8. Fukushima, S. and Tatsuoka, F. (1984), "Strength and deformation characteristics of saturated sand at extremely low pressure", Soils Found., 24(4), 30-48. https://doi.org/10.3208/sandf1972.24.4_30
  9. Gourvenec, S. and Jensen, K. (2009), "Effect of embedment and spacing of cojoined skirted foundation systems on undrained limit states under general loading", Int. J. Geomech., 9(6), 267-279. https://doi.org/10.1061/(ASCE)1532-3641(2009)9:6(267)
  10. Hettler, A. and Gudehus, G. (1989), "Influence of the foundation width on the bearing capacity factor", Soils Found., 38 (4), 81-92.
  11. IS 6403 (1981), Determination of Bearing Capacity of Shallow Foundation; Bureau of Indian Standard.
  12. Lancelot, L., Shahrour, I. and Al Mahmoud, M. (2006), "Failure and dilatancy properties of sand at relatively low stresses", J. Eng. Mech., 132(12), 1396-1399. https://doi.org/10.1061/(ASCE)0733-9399(2006)132:12(1396)
  13. Maeda, K. and Miura, K. (1999), "Confining stress dependency of mechanical properties of sands", Soils Found., 39(1), 53-67. https://doi.org/10.3208/sandf.39.53
  14. Mahmoud, M.A. and Abdrabbo, F.M. (1989), "Bearing capacity of strip footing resting on reinforced sand subgrades", Can. Geotech. J., 26(1), 154-159. https://doi.org/10.1139/t89-015
  15. Mana, D.S.K., Gourvenec, S.M. and Martin, C.M. (2013), "Critical skirt spacing for shallow foundations under general loading", J. Geotech. Geoenviron. Eng., 139(9), 1554-1566. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000882
  16. Meyerhof, G.G. (1963), "Some recent research on bearing capacity of foundations", Can. Geotech. J., 1(1), 16-26. https://doi.org/10.1139/t63-003
  17. Pusadkar, S.S. and Bhatkar, T. (2013), "Behavior of raft foundation with vertical skirt using plaxis 2d", Int. J. Eng. Res. Develop., 7(6), 20-24.
  18. Saleh, N.M., Alsaied, A.E. and Elleboudy, A.M. (2008), "Performance of skirted strip footing subjected to eccentric inclined load", Electron. J. Geotech. Eng., 13, 1-13.
  19. Terzaghi, K. (1943), Theoretical Soil Mechanics, Wiley, New York, NY, USA.
  20. Ueno, K., Miura, K. and Maeda, Y. (1998), "Prediction of ultimate bearing capacity of surface footings with regard to size effect", Soils Found., 38(3), 165-178. https://doi.org/10.3208/sandf.38.3_165
  21. Vesic, A.S. (1973), "Analysis of ultimate loads of shallow foundations", J. Soil Mech. Found. Eng., 99(1), 45-73.
  22. Wakil, A.Z. EL. (2010), "Horizontal capacity of skirted circular shallow footings on sand", Alexandria Eng. J., 49(4), 379-385. https://doi.org/10.1016/j.aej.2010.07.003
  23. Wakil, A.Z. EL. (2013), "Bearing capacity of skirt circular footing on sand", Alexandria Eng. J., 52(3), 359-364. https://doi.org/10.1016/j.aej.2013.01.007
  24. Yun, G. and Bransby, M.F. (2007), "The undrained vertical bearing capacity of skirted foundations", Soils Found., 47(3), 493-505. https://doi.org/10.3208/sandf.47.493

Cited by

  1. Performance of Multi-Edge Skirted Footings Resting on Sand 2018, https://doi.org/10.1007/s40098-017-0270-6
  2. Axial Uplift Behaviour of Belled Piers in Coarse-Grained Saline Soils vol.2018, pp.1687-8094, 2018, https://doi.org/10.1155/2018/4735423
  3. Finite-Element Limit Analysis of Strip and Circular Skirted Footings on Sand vol.19, pp.3, 2019, https://doi.org/10.1061/(ASCE)GM.1943-5622.0001370
  4. Consideration of locked-in stresses during backfill preparation vol.18, pp.3, 2017, https://doi.org/10.12989/gae.2019.18.3.247
  5. Model studies of plus and double box shaped skirted footings resting on sand vol.11, pp.1, 2017, https://doi.org/10.1186/s40703-020-00109-0
  6. Dynamic response and design of a skirted strip foundation subjected to vertical vibration vol.20, pp.4, 2017, https://doi.org/10.12989/gae.2020.20.4.345
  7. Experimental and numerical studies of skirted hexagonal footings on three sands vol.2, pp.3, 2017, https://doi.org/10.1007/s42452-020-2239-9
  8. A Study on Bearing Capacity of Skirted Square Footings on Different Sands vol.50, pp.6, 2017, https://doi.org/10.1007/s40098-020-00440-4