Geomechanics and Engineering

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Behavior of a combined piled raft foundation in a multi-layered soil subjected to vertical loading

  • Bandyopadhyay, Srijit (Reactor Safety Division, Bhabha Atomic Research Centre) ;
  • Sengupta, Aniruddha (Department of Civil Engineering, Indian Institute of technology) ;
  • Parulekar, Y.M. (Reactor Safety Division, Bhabha Atomic Research Centre)
  • Received : 2019.03.27
  • Accepted : 2020.04.03
  • Published : 2020.05.25
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Abstract

The behavior of a piled raft system in multi-layered soil subjected to vertical loading has been studied numerically using 3D finite element analysis. Initially, the 3D finite element model has been validated by analytically simulating the field experiments conducted on vertically loaded instrumented piled raft. Subsequently, a comprehensive parametric study has been conducted to assess the performance of a combined piled raft system in terms of optimum pile spacing and settlement of raft and piles, in multi-layered soil stratum subjected to vertical loading. It has been found that a combined pile raft system can significantly reduce the total settlement as well as the differential settlement of the raft in comparison to the raft alone. Two different arrangements below the piled raft with the same pile numbers show a significant amount of increase of load transfer of piled raft system, which is in line with the load transfer mechanism of a piled raft. A methodology for the factor of safety assessment of a combined pile raft foundation has been presented to improve the performance of piled raft based on its serviceability requirements. The findings of this study could be used as guidelines for achieving economical design for combined piled raft systems.

Keywords

Acknowledgement

We thank the Editor-in-chief and three anonymous reviewers, whose comments/suggestions helped improve and clarify this manuscript. The technical support for modeling CPRF from Mr. Tarvinder Singh of BARC, Mumbai and Co researchers of IIT Kharagpur is gratefully acknowledged.

References

  1. Algulin, J. and Pedersen, B. (2014), "Modeling of piled raft foundation as a plane strain model in Plaxis 2D", Master Dissertation, Chalmers University, Gothenburg, Sweden.
  2. Alnuaim, A.M., El Naggar, H. and El Naggar, M.H. (2017), "Evaluation of piled raft performance using a verified 3D nonlinear numerical model", Geotech. Geol. Eng., 35(4), 1831-1845. https://doi.org/10.1007/s10706-017-0212-1.
  3. Balakumar, V., Oh, E., Bolton, M. and Balasubramaniam, A. (2013), "A design method for piled raft foundations", Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris, France, January.
  4. Basile, F. (2015), "Non-linear analysis of vertically loaded piled rafts", Comput. Geotech., 63, 73-82. https://doi.org/10.1016/j.compgeo.2014.08.011.
  5. Bhowmik, D., Baidya, D. and Dasgupta, S. (2013), "A numerical and experimental study of hollow steel pile in layered soil subjected to lateral dynamic loading", Soil Dyn. Earthq. Eng., 53, 119-129. https://doi.org/10.1016/j.soildyn.2013.06.011.
  6. Bourgeois, E., De Buhan, P. and Hassen, G. (2012), "Settlement analysis of piled-raft foundations by means of a multiphase model accounting for soil- pile interactions", Comput. Geotech., 46, 26-38. https://doi.org/10.1016/j.compgeo.2012.05.015.
  7. Butterfield, R. and Banerjee, P. (1971), "The problem of pile group-pile cap interaction", Geotechnique, 21(2), 135-142. https://doi.org/10.1680/geot.1971.21.2.135.
  8. Cho, J., Lee, J.H., Jeong, S. and Lee, J. (2012), "The settlement behavior of piled raft in clay soils", Ocean Eng., 53, 153-163. https://doi.org/10.1016/j.oceaneng.2012.06.003.
  9. Choudhury, D., Phanikanth, V., Mhaske, S.Y., Phule, R.R. and Chatterjee, K. (2015), "Seismic liquefaction hazard and site response for design of piles in Mumbai city", Indian Geotech. J., 45(1), 62-78. https://doi.org/10.1007/s40098-014-0108-4.
  10. Chow, Y., Yong, K. and Shen, W. (2001), "Analysis of piled raft foundations using a variational approach", Int. J. Geomech., 1(2), 129-147. https://doi.org/10.1061/(ASCE)1532-3641(2001)1:2(129).
  11. Cooke, R. (1986), "Piled raft foundations on stiff clay-a contribution to design philosophy", Geotechnique, 36(2), 169-203. https://doi.org/10.1680/geot.1986.36.2.169.
  12. De Sanctis, L. and Mandolini, A. (2006), "Bearing capacity of piled rafts on soft clay soils", J. Geotech. Geoenviron. Eng., 132(12), 1600-1610. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:12(1600).
  13. De Sanctis, L. and Russo, G. (2008), "Analysis and performance of piled rafts designed using innovative criteria", J. Geotech. Geoenviron. Eng., 134(8), 1118-1128. https://doi.org/10.1061/(ASCE)1090-0241(2008)134:8(1118).
  14. El-Garhy, B., Galil, A.A., Youssef, A.F. and Raia, M.A. (2013), "Behavior of raft on settlement reducing piles: Experimental model study", J. Rock Mech. Geotech. Eng., 5(5), 389-399. https://doi.org/10.1016/j.jrmge.2013.07.005.
  15. Elwakil, A. and Azzam, W. (2016), "Experimental and numerical study of piled raft system", Alexandria Eng. J., 55(1), 547-560. https://doi.org/10.1016/j.aej.2015.10.001.
  16. Franke, E. (1991), "Measurements beneath piled rafts", Proceedings of the ENPC Conference on Deep Foundations, Paris, France, March.
  17. Horikoshi, K. and Randolph, M. (1998), "A contribution to optimum design of piled rafts", Geotechnique, 48(3), 301-317. https://doi.org/10.1680/geot.1998.48.3.301.
  18. Ibrahim, K., Bunce, G. and Murrells, C. (2009), "Foundation design for the Pentominium tower in Dubai, UAE", Proc. Inst. Civ. Eng. Civ. Eng., 162(6), 25-33. https://doi.org/10.1680/cien.2009.162.6.25.
  19. IS-456, I.S. (2000), Reinforced Concrete-Code of Practice (4th Revision).
  20. IS-2911, I.S. (2010), Design and Construction of Pile Foundations-Code of Practice (2nd revision).
  21. Jeong, S. and Cho, J. (2014), "Proposed nonlinear 3-D analytical method for piled raft foundations", Comput. Geotech., 59, 112-126. https://doi.org/10.1016/j.compgeo.2014.02.009.
  22. Jeong, S., Seo, D., Lee, J. and Park, J. (2004), "Time-dependent behavior of pile groups by staged construction of an adjacent embankment on soft clay", Can. Geotech. J., 41(4), 644-656. https://doi.org/10.1139/t04-024.
  23. Katzenbach, R., Arslan, U. and Moormann, C. (2000), 13. Piled Raft Foundation Projects in Germany, in Design Applications of Raft Foundations, Thomas Telford, U.K., 323.
  24. Katzenbach, R., Bachmann, G. and Ramm, H. (2005), "Combined Pile Raft Foundation (CPRF): An appropriate solution for foundation of high-rise building", Sloak J. Civ. Eng., 19-29.
  25. Katzenbach, R. and Choudhury, D. (2013), ISSMGE Combined Pile-Raft Foundation Guideline, International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE), Darmstadt, Germany, 1-28.
  26. Katzenbach, R., Leppla, S. and Choudhury, D. (2016), Foundation Systems for High-Rise Structures, CRC Press.
  27. Katzenbach, R. and Moormann, C. (2002), "Recommendations for the design and construction of piled rafts", Proceedings of the 15th International Conference on Soil Mechanics and Geotechnical Engineering, Istanbul, Turkey, September.
  28. Khanmohammadi, M. and Fakharian, K. (2018), "Evaluation of performance of piled-raft foundations on soft clay: A case study", Geomech. Eng., 14(1), 43-50. https://doi.org/10.12989/gae.2018.14.1.043.
  29. Ko, J., Cho, J. and Jeong, S.S. (2018), "Analysis of load sharing characteristics for a piled raft foundation", Geomech. Eng., 16(4), 449-461. https://doi.org/10.12989/gae.2018.16.4.449.
  30. Koizumi, Y. and Ito, K. (1967), "Field tests with regard to pile driving and bearing capacity of piled foundations", Soils Found., 7(3), 30-53. https://doi.org/10.3208/sandf1960.7.3_30.
  31. Kumar, A. and Choudhury, D. (2018), "Development of new prediction model for capacity of combined pile-raft foundations", Comput. Geotech., 97, 62-68. https://doi.org/10.1016/j.compgeo.2017.12.008.
  32. Kumar, A., Patil, M. and Choudhury, D. (2017), "Soil-structure interaction in a combined pile-raft foundation-a case study", Proc. Inst. Civ. Eng. Geotech. Eng., 170(2), 117-128. https://doi.org/10.1680/jgeen.16.00075.
  33. Lee, J., Kim, Y. and Jeong, S. (2010), "Three-dimensional analysis of bearing behavior of piled raft on soft clay", Comput. Geotech., 37(1-2), 103-114. https://doi.org/10.1016/j.compgeo.2009.07.009.
  34. Lee, J., Park, D. and Choi, K. (2014), "Analysis of load sharing behavior for piled rafts using normalized load response model", Comput. Geotech., 57, 65-74. https://doi.org/10.1016/j.compgeo.2014.01.003.
  35. Lee, J., Park, D., Park, D. and Park, K. (2015), "Estimation of load-sharing ratios for piled rafts in sands that includes interaction effects", Comput. Geotech., 63, 306-314. https://doi.org/10.1016/j.compgeo.2014.10.014.
  36. Long, P.D. (1993), "Footings with settlement-reducing piles in non-cohesive soil", Proceedings of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE), Darmstadt, Germany.
  37. Long, P.D. and Vietnam, V.W. (2010), "Piled rafta cost-effective foundation method for high-rises", Geotech. Eng., 41(1), 149.
  38. Mandolini, A., Russo, G. and Viggiani, C. (2005), "Pile foundations: Experimental investigations, analysis and design", Proceedings of the International Conference on Soil Mechanics and Geotechnical Engineering, Osaka, Japan, September.
  39. MIDAS, G. (2019), GTS NX User Manual.
  40. Nakanishi, K. and Takewaki, I. (2013), "Optimum pile arrangement in piled raft foundation by using simplified settlement analysis and adaptive step-length algorithm", Geomech. Eng., 5(6), 519-540. http://doi.org/10.12989/gae.2013.5.6.519.
  41. Nguyen, D.D.C., Jo, S.B. and Kim, D.S. (2013), "Design method of piled-raft foundations under vertical load considering interaction effects", Comput. Geotech., 47, 16-27. https://doi.org/10.1016/j.compgeo.2012.06.007.
  42. Nguyen, D.D.C., Kim, D.S. and Jo, S.B. (2014), "Parametric study for optimal design of large piled raft foundations on sand", Comput. Geotech., 55, 14-26. https://doi.org/10.1016/j.compgeo.2013.07.014.
  43. Park, D. and Lee, J. (2014), "Comparative analysis of various interaction effects for piled rafts in sands using centrifuge tests", J. Geotech. Geoenviron. Eng., 141(1), 04014082. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001183.
  44. Park, D., Park, D. and Lee, J. (2016), "Analyzing load response and load sharing behavior of piled rafts installed with driven piles in sands", Comput. Geotech., 78, 62-71. https://doi.org/10.1016/j.compgeo.2016.05.008.
  45. Poulos, H.G. (1994), "An approximate numerical analysis of pile-raft interaction", Int. J. Numer. Anal. Meth. Geomech., 18(2), 73-92. https://doi.org/10.1002/nag.1610180202.
  46. Poulos, H.G (2001), "Piled raft foundations: Design and applications", Geotechnique, 51(2), 95-113. https://doi.org/10.1680/geot.51.2.95.40292
  47. Prakoso, W.A. and Kulhawy, F.H. (2001), "Contribution to piled raft foundation design", J. Geotech. Geoenviron. Eng., 127(1), 17-24. https://doi.org/10.1061/(ASCE)1090-0241(2001)127:1(17).
  48. Rabiei, M. (2010), "Effect of pile configuration and load type on piled raft foundations performance", Proceedings of the GeoShanghai International Conference 2010, Shanghai, China, June.
  49. Rabiei, M. and Choobbasti, A.J. (2016), "Piled raft design strategies for high rise buildings", Geotech. Geol. Eng., 34(1), 75-85. https://doi.org/10.1007/s10706-015-9929-x.
  50. Reul, O. and Randolph, M.F. (2004), "Design strategies for piled rafts subjected to nonuniform vertical loading", J. Geotech. Geoenviron. Eng., 130(1), 1-13. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:1(1).
  51. Russo, G., Abagnara, V., Poulos, H.G. and Small, J.C. (2013), "Re-assessment of foundation settlements for the Burj Khalifa, Dubai", Acta Geotechnica, 8(1), 3-15. https://doi.org/10.1007/s11440-012-0193-4.
  52. Sinha, A. and Hanna, A. (2016), "3D numerical model for piled raft foundation", Int. J. Geomech., 17(2), 04016055. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000674.
  53. Wiesner, T. and Brown, P. (1980), "Laboratory tests on model piled raft foundations", J. Geotech. Geoenviron. Eng., 106(ASCE 15576).
  54. Yamashita, K., Yamada, T. and Hamada, J. (2011), "Investigation of settlement and load sharing on piled rafts by monitoring full-scale structures", Soils Found., 51(3), 513-532. https://doi.org/10.3208/sandf.51.513.
  55. Zhang, Q.Q., Zhang, Z.M., Yu, F. and Liu, J.W. (2010), "Field performance of long bored piles within piled rafts", Proc. Inst. Civ. Eng. Geotech. Eng., 163(6), 293-305. https://doi.org/10.1680/geng.2010.163.6.293.