DOI QR코드

DOI QR Code

Influence of inclusion of geosynthetic layer on response of combined footings on stone column reinforced earth beds

  • Maheshwari, Priti (Department of Civil Engineering, Indian Institute of Technology Roorkee) ;
  • Khatri, Shubha (Formerly Research Scholar, Department of Civil Engineering, Indian Institute of Technology Roorkee)
  • 투고 : 2011.04.27
  • 심사 : 2012.10.05
  • 발행 : 2012.12.25

초록

The present paper deals with the analysis of combined footings resting on geosynthetic reinforced granular fill overlying stone column improved poor soil. An attempt has been made to study the influence of inclusion of geosynthetic layer on the deflection of the footing. The footing has been idealized as a beam having finite flexural rigidity. Granular fill layer has been represented by Pasternak shear layer and stone columns and poor soil have been represented by nonlinear Winkler springs. Nonlinear behavior of granular fill layer, stone columns and the poor soil has been considered by means of hyperbolic stress strain relationships. Governing differential equations for the soil-foundation system have been derived and solution has been obtained employing finite difference scheme by means of iterative Gauss Elimination method. Results of a detailed parametric study have been presented, for a footing supporting typically five columns, in non-dimensional form in respect of deflection with and without geosynthetic inclusion. Geosynthetic layer has been found to significantly reduce the deflection of the footing which has been quantified by means of parametric study.

키워드

참고문헌

  1. Alamgir, M., Muira, N., Poorooshasb, H.B. and Madhav, M.R. (1996), "Deformation analysis of soft ground reinforced by columnar inclusions", Comput. Geotech., 18(4), 267-290. https://doi.org/10.1016/0266-352X(95)00034-8
  2. Balaam, N,P. and Booker, J.R. (1981), "Analysis of rigid raft supported by granular piles", Int. J. Anal. Numer. Method. Geomech., 5(4), 379-403. https://doi.org/10.1002/nag.1610050405
  3. Bowles, J.E. (1996), "Foundation analysis and design", 5th Edition, McGraw-Hill Book Co., Singapore.
  4. Das, B.M. (1999), "Principles of foundation engineering", PWS Publishing, USA.
  5. Deb, K. (2008), "Modeling of granular bed-stone column-improved soft soil", Int. J. Anal. Numer. Method. Geomech., 32, 1267-1288. https://doi.org/10.1002/nag.672
  6. Deb, K., Basudhar, P.K. and Chandra, S. (2007), "Generalized model for geosynthetic-reinforced granular fillsoft soil with stone columns", Int. J. Geomech. - ASCE, 7(4), 266-276. https://doi.org/10.1061/(ASCE)1532-3641(2007)7:4(266)
  7. Desai, C.S. and Abel, J.F. (1987), "Introduction to the finite element method: a numerical method for engineering analysis", CBS Publishers and Distributors, India.
  8. Ghosh, C. and Madhav, M.R. (1994), "Settlement response of a reinforced shallow earth bed", Geotext. Geomembranes, 13(9), 643-656. https://doi.org/10.1016/0266-1144(94)90065-5
  9. Han, J. and Gabr, M.A. (2002), "Numerical analysis of geosynthetic - reinforced and pile - supported earth platforms over soft soil", J. Geotech. Geoenviron. Eng. - ASCE, 128(1), 44-53. https://doi.org/10.1061/(ASCE)1090-0241(2002)128:1(44)
  10. Kondner, R.L. and Zelasko, J.S. (1963), "A hyperbolic stress-strain formulation of sand", Proc. of 2nd Pan American Conf. on Soil Mechanics and Foundation Engineering, 1, 289-324.
  11. Lee, J.S. and Pande, G.N. (1998), "Analysis of stone-column reinforced foundations", Int. J. Anal. Numer. Method. Geomech., 12(12), 1001-1020.
  12. Madhav, M.R. and Poorooshasb, H.B. (1988), "A new model for geosynthetic - reinforced soil", Comput. Geotech., 6(4), 277-290. https://doi.org/10.1016/0266-352X(88)90070-5
  13. Maheshwari, P., Basudhar, P.K. and Chandra, S. (2004), "Analysis of beams on reinforced granular beds", Geosynth. Int., 11(6), 470-480. https://doi.org/10.1680/gein.2004.11.6.470
  14. Maheshwari, Priti, Khatri, Shubha (2010), "Nonlinear response of footings on granular bed - stone column -reinforced poor soil", Int. J. Geotech. Eng., 4(4), 435-443. https://doi.org/10.3328/IJGE.2010.04.04.435-443
  15. Nogami, T. and Yong, T.Y. (2003), "Load - settlement analysis of geosynthetic - reinforced soil with a simplified model", Soils Found., 43(3), 33-42. https://doi.org/10.3208/sandf.43.3_33
  16. Poorooshasb, H.B. and Meyerhof, G.G. (1997), "Analysis of behavior of stone columns and lime columns", Comput. Geotech., 20(1), 47-70. https://doi.org/10.1016/S0266-352X(96)00013-4
  17. Shahu, J.T., Madhav, M.R. and Hayashi, S. (2000), "Analysis of soft ground - granular pile - granular mat system", Comput. Geotech., 27(1), 45-62. https://doi.org/10.1016/S0266-352X(00)00004-5
  18. Shukla, S.K. and Chandra, S. (1994), "A generalized mechanical model for geosynthetic-reinforced foundation soil", Geotext. Geomembranes, 13(12), 813-825. https://doi.org/10.1016/0266-1144(94)00018-9
  19. Som, N.N. and Das, S.C. (2003), "Theory and practice of foundation design", Prentice - Hall of India Private Limited, New Delhi.
  20. Yin, J.H. (1997), "Modeling geosynthetic - reinforced granular fills over soft soil", Geosynth. Int., 4(2), 165-185. https://doi.org/10.1680/gein.4.0092

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