DOI QR코드

DOI QR Code

Settlement of and load distribution in a granular piled raft

  • Madhav, Madhira R. (Geoenvironmental Engineering Centre, J.N. Technical University) ;
  • Sharma, J.K. (College of Engineering, Kota) ;
  • Sivakumar, V. (School of Civil Engineering, Queen's University)
  • Received : 2008.10.27
  • Accepted : 2009.03.16
  • Published : 2009.03.25

Abstract

The interactions between a granular pile and raft placed on top are investigated using the continuum approach. The compatibility of vertical and radial displacements along the pile - soil interface and of the vertical displacements along the raft - top of ground interfaces are satisfied. Results show that consideration of radial displacement compatibility does not influence the settlement response of or sharing of the applied load between the granular pile and the raft. The percentage load carried by the granular pile (GP) increases with the increase of its stiffness and decreases with the increase of the relative size of raft. The normal stresses at the raft - soil interface decrease with the increase of stiffness of GP and/or relative length of GP. The influences of GP stiffness and relative length of GP are found to be more for relatively large size of raft. The percentage of load transferred to the base of GP increases with the increase of relative size of raft.

Keywords

References

  1. Aboshi, H., Ichimoto, E., Enoki, M. and Harada, K. (1979), "The compozer - a method to improve characteristics of soft clays by inclusion of large diameter sand columns", Proc. Int. Conf. on Soil Reinf.: Reinforced Earth and Other Techniques, Paris: 1, 211-216.
  2. Alamgir, M., Miura, N., Poorooshasb, H.B. and Madhav, M.R. (1996), "Deformation analysis of soft ground reinforced by columnar inclusions", Comput. Geotech., 18(4), 267-299. https://doi.org/10.1016/0266-352X(95)00034-8
  3. Balaam, N.P. and Booker, J.R. (1981), "Analysis of rigid raft supported by granular piles", Int. J. Numer. Anal. Method., 5, 379-403. https://doi.org/10.1002/nag.1610050405
  4. Baumann, V. and Bauer, G.E. (1974), "The performance of foundations on various soils stabilized by vibrocompaction method", Can. Geotech. J., 11, 509-530. https://doi.org/10.1139/t74-056
  5. Butterfield, R. and Banerjee, P.K. (1971), "The problem of pile group-pile cap interaction", Geotech., 21(2), 135-142. https://doi.org/10.1680/geot.1971.21.2.135
  6. Davis, E.H. and Poulos, H.G. (1972), "The analysis of pile-raft systems", Aust. Geomech. J., G2(1), 21-27.
  7. Eurocode (1995), "Design of concrete structures - Part 3: concrete foundations", Prepare for the Commission of European Communities.
  8. Goughnour, R.R. and Bayuk, A.A. (1979), "A field study of long term settlements of loads supported by stone columns in soft ground", Proc. Int. Conf. on Soil Reinf.: Reinforced Earth and Other Techniques, Paris, 1, 279-286.
  9. Horikoshi, K. and Randolph, M.F. (1998), "A contribution to optimum design of piled rafts", Geotech., 48(3), 301-318. https://doi.org/10.1680/geot.1998.48.3.301
  10. Mattes, N.S. (1969), "The influence of radial displacement compatibility on pile settlement", Geoteh., 19(2), 157-159.
  11. Mattes, N.S. and Poulus, H.G. (1969), "Settlement of single compressible pile", J. SM F Div., ASCE, 95, 189-207.
  12. Mindlin, R.D. (1936), "Force at a point in the interior of a semi-infinite solid", J. Appl. Phys., 7(5), 195-202.
  13. Muir Wood, D., Hu, W. and Nash, D.F.T. (2000), "Group effect in stone column foundations: Model tests", Geotech., 50(6), 689-698. https://doi.org/10.1680/geot.2000.50.6.689
  14. Poorooshasb, H.B. and Meyerhof, G.G. (1997), "Analysis of behaviour of stone columns and lime columns", Comput. Geotech., 20(1), 47-70. https://doi.org/10.1016/S0266-352X(96)00013-4
  15. Poulos, H.G. (1968), "The influence of rigid pile cap on the settlement behaviour of an axially loaded pile", C.E. Trans. Inst. Engrs., Australia, CE10(2), 206-208.
  16. Priebe, H. (1976), "Estimating settlement of gravel column consolidated soil", Die Bautechnik, 53, 160-162.
  17. Priebe, H. (1995), The Design of Vibroreplacement, Ground Engineering, 31-37.
  18. Randolph, M.F. (1983), "Design of piled raft foundations", Proc. Int. Symp. On Recent Dev. In Lab. And Field Tests and Anal. Of Geotech. Problems, Bangkok, 525-537.
  19. Sharma, J.K. (1999), "Analysis and settlement of granular pile(s) - single, in group and with raft", Ph.D. Thesis, I.I.T., Kanpur, 408.
  20. Sivakumar, V., McKelvey, D. Graham, J. and Hughes, D. (2004), "Triaxial tests on model sand columns in clay", Can. Geotech. J., 41, 299-312. https://doi.org/10.1139/t03-097
  21. Van Impe, W.F. and De Beer, E. (1983), "Improvement of settlement behaviour of soft layers by means of stone columns", Proc. 7th EC SMFE, Helsinki, 1, 1207-1210.
  22. Van Impe, W.F. and Madhav, M.R. (1992), "Analysis and settlement of dilating stone column reinforced soil", Osterreichische Ing. und Arch.-Zeitschrift, 137, 114-121.
  23. Watts, K.S., Johnson, D., Wood, L.A. and Saad, A. (2000), "An instrumented trial of vibro ground treatment supporting strip foundations in a variable fill", Geotech., 50(6), 699-708. https://doi.org/10.1680/geot.2000.50.6.699
  24. Watts, K.S. and Serridge, C.J. (2000), "A trial vibro bottom-feed stone column treatment in soft clay soil", 4th Int. Conf. on Ground Improvement Geosystems: Grouting, Soil Improvement and Geosystems including Reinforcement, Helsinki, 549-556.

Cited by

  1. Performance of Granular Piles-Improved Soft Ground Under Raft Foundation: A Numerical Study vol.3, pp.4, 2017, https://doi.org/10.1007/s40891-017-0113-7
  2. Analysis of flexible raft resting on soft soil improved by granular piles considering soil shear interaction vol.94, 2018, https://doi.org/10.1016/j.compgeo.2017.09.007
  3. An analytical analysis of a single axially-loaded pile using a nonlinear softening model vol.8, pp.6, 2015, https://doi.org/10.12989/gae.2015.8.6.769
  4. Effect of different parameters on the behavior of strip footing resting on weak soil improved by granular piles vol.8, pp.1, 2017, https://doi.org/10.1186/s40703-017-0042-2
  5. Finite element analyses of the stability of a soil block reinforced by shear pins vol.12, pp.6, 2009, https://doi.org/10.12989/gae.2017.12.6.1021
  6. Effect of Nonlinear Non-homogeneity of Floating Granular Pile and Soil on Settlement vol.100, pp.2, 2019, https://doi.org/10.1007/s40030-018-0347-y