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Large scale model testing to investigate the influence of granular cushion layer on the performance of disconnected piled raft system

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Abstract

This paper presents the results of 1g model tests performed on instrumented model foundations, i.e., unpiled raft, single piled raft, single disconnected piled raft (DPR) and 3 × 3 DPR in sand under vertical load by using different granular materials and thickness of the granular cushion layer to investigate the effects of granular cushion on the performance of DPR system. The Settlement Efficiency (η) of the DPR which is nonlinear in nature is found to increase as the cushion thickness decreases and the mean particle size (d50) of the cushion material increases. A cushion thickness of two times the pile diameter and cushion material having d50 more than or, equals to 2 mm might serve as the suitable cushion material for the optimum performance of 3 × 3 DPR. The neutral axis and the zone of occurrence of maximum axial load of the pile in DPR are found to move downward with increasing cushion thickness. The piles in DPR are found to carry 35% of the total superstructure load within the settlement range considered in the study.

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References

  1. ACI 318-89 (1969) ACI standard-building code requirements for reinforced concrete. Detroit, New York

    Google Scholar 

  2. Ata A, Badrawi E, Nabil M (2015) Numerical analysis of unconnected piled raft with cushion. Ain Shams Eng J 6:421–428

    Article  Google Scholar 

  3. Azizkandi A, Rasouli H, Baziar MH (2018) Load sharing and carrying mechanism of piles in non-connected pile rafts using a numerical approach. Int J Civ Eng. https://doi.org/10.1007/s40999-018-0356-2

    Article  Google Scholar 

  4. BS 8004 (1986) Foundations. British Standards Institution, London

    Google Scholar 

  5. Burland JB, Broms BB, de Mello VFB (1977) Behavior of foundations and structures. In: Proceedings of 9th international conference on soil mechanics, Tokyo, vol 2, pp 495–546

  6. Cao XD, Wong IH, Chang MF (2004) Behavior of model rafts resting on pile-reinforced sand. J Geotech Geoenviron Eng 130(2):129–138

    Article  Google Scholar 

  7. Clancy P, Randolph MF (1993) An approximate analysis procedure for piled raft foundations. Int J Numer Anal Methods Geomech 17:849–869

    Article  Google Scholar 

  8. Clancy P, Randolph MF (1996) Simple design tools for piled raft foundations. Geotechnique 46(2):313–328

    Article  Google Scholar 

  9. Cooke RW (1986) Piled raft foundations on stiff clays—a contribution to design philosophy. Geotechnique 36(2):169–203

    Article  Google Scholar 

  10. Dezfouli M, Dehghani M, Asakereh A, Kalantari B (2018) Behavior of geogrid reinforced and unreinforced non-connected pile raft foundation. Int J Civ Eng. https://doi.org/10.1007/s40999-018-0362-4

    Article  Google Scholar 

  11. El Sawwaf M (2010) Experimental study on eccentrically loaded raft with connected and disconnected shorts piles. J Geotech Geoenviron Eng 136(10):1394–1402

    Article  Google Scholar 

  12. Eslami A, Veiskarami M, Eslami MM (2012) Study on optimized piled-raft foundations (PRF) performance with connected and non-connected piles—three case histories. Int J Civ Eng 10(2):100–111

    Google Scholar 

  13. Fioravante V, Giretti D (2010) Contact versus noncontact piled raft foundations. Can Geotech J 47:1271–1287

    Article  Google Scholar 

  14. Fioravante V (2011) Load transfer from a raft to a pile with an interposed layer. Geotechnique 61(2):121–132

    Article  Google Scholar 

  15. Giretti D (2010) Modelling of piled raft foundations in sand. Ph.D. thesis, The University of Ferrara, Italy

  16. Hor B, Song MJ, Jung MH, Song YH, Park YH (2015) A 3D FEM analysis on the performance of disconnected piled raft foundation. In: Proceedings of 15th Asian regional conference on soil mechanics and geotechnical engineering, South Korea, vol 2, no 34, pp 1238–1243

  17. Horikoshi K, Randolph MF (1998) A contribution to optimum design of piled raft. Geotechnique 48(3):301–317

    Article  Google Scholar 

  18. IS 2720-13 (1986) Methods of test for soils, part 13: direct shear test. Bureau of Indian Standards, New Delhi

    Google Scholar 

  19. IS 2720-14 (1983) Methods of test for soils, part 14: determination of density index (relative density) of cohesionless soils. Bureau of Indian Standards, New Delhi

    Google Scholar 

  20. Jamiolkowski MB, Ricceri G, Simonini P (2009) Safeguarding Venice from high tides: site characterization and geotechnical problems. In: Proceedings of international conference on soil mechanics and geotechnical engineering, Alexandria, vol 4. pp 3209–3230

  21. Katzenbach R, Choudhury D (2013) ISSMGE combined pile–raft foundation guideline. In: Katzenbach R, Choudhury D (eds) TC212 design guideline. Darmstadt, Germany, pp 1–23

    Google Scholar 

  22. Katzenbach R, Arslan U, Moorman C (2000) Piled raft foundation projects in Germany. Design Applications of Raft Foundation, Thomas Telford, pp 323–391

    Google Scholar 

  23. Katzenbach R, Leppla S, Choudhury D (2016) Foundation systems for high-rise structures. CRC Press, Boca Raton

    Book  Google Scholar 

  24. Kumar A, Choudhury D (2018) Development of new prediction model for capacity of combined pile-raft foundations. Comput Geotech 97:62–68

    Article  Google Scholar 

  25. Kumar A, Choudhury D (2017) Load sharing mechanism of combined pile-raft foundation (CPRF) under seismic loads. Geotech Eng J Southeast Asian Geotech Soc (SEAGS) Assoc Geotech Soc Southeast Asia (AGSSEA) 48(3):95–101

    Google Scholar 

  26. Kumar A, Patil M, 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

    Article  Google Scholar 

  27. Liang FY, Chen IZ, Shi XG (2003) Numerical analysis of composite piled raft with cushion subjected to vertical load. Comput Geotech 30(6):443–453

    Article  Google Scholar 

  28. Liang FY, Li J, Chen IZ (2006) Optimization of composite piled raft foundation with varied rigidity of cushion. Foundation analysis and Design, ASCE, Reston, pp 29–34

    Google Scholar 

  29. Mattsson N, Simon C, Menoret A, Ray M (2013) Case study of a full-scale load test of a piled raft with an interposed layer for a nuclear storage facility. Geotechnique 63(11):965–976

    Article  Google Scholar 

  30. Park H, Ko K, Song Y, Song M, Jin S, Ha J, Kim D (2020) Centrifuge modeling of disconnected piled raft using vertical pushover tests. Acta Geotech. https://doi.org/10.1007/s11440-020-00928-6

    Article  Google Scholar 

  31. Patil JD, Vasanvala SA, Solanki CH (2016) An experimental study on behavior of piled raft foundation. Indian Geotech J 46(1):16–24

    Article  Google Scholar 

  32. Pecker A (2004) Design and construction of the Rion Antirion Bridge. In: Proceedings of geo-trans, geotechnical engineering for transportation projects, los angeles, California, ASCE, GSP 126, pp 216–240

  33. Poulos HG, Davis EH (1980) Pile foundation analysis and design. Wiley, New York

    Google Scholar 

  34. Randolph MF (1994) Design methods for pile groups and piled rafts. In: Proceedings of 13th ICSMFE, New Delhi, vol 5, pp 61–82

  35. Rasouli H, Azizkandi AS, Baziar M, Modarresi M, Shahnazari H (2015) Centrifuge modeling of non-connected piled raft system. Int J Civ Eng 13(2):114–123

    Google Scholar 

  36. Reddy KM, Ayothiraman R (2015) Experimental studies on behavior of single pile under combined uplift and lateral loading. J Geotech Geoenviron Eng 141(7):04015030-(1-10)

    Google Scholar 

  37. Saadatinezhad M, Lakirouhani A, Asli SJ (2019) Seismic response of non-connected piled raft foundations. Int J Geotech Eng. https://doi.org/10.1080/19386362.2019.1565392

    Article  Google Scholar 

  38. Sanctis LD, Mandolini A (2006) Bearing capacity of piled raft on soft clay soil. J Geotech Geoenviron Eng 132(12):1600–1610

    Article  Google Scholar 

  39. Sharma VJ, Vasanvala SA, Solanki CH (2015) Behaviour of cushioned composite piled raft foundation under lateral forces. Indian Geotech J 45(1):89–97

    Article  Google Scholar 

  40. Tradigo F, Pisano F, di Prisco C, Mussi A (2015) Non-linear soil-structure interaction in disconnected piled raft foundations. Comput Geotech 63:121–134

    Article  Google Scholar 

  41. Wong IH, Chang MF, Cao XD (2000) Raft foundations with disconnected settlement reducing piles. Hemsley JA (eds) Design application of raft foundations and ground slabs, Chap. 17, Thomas Telford, London, pp 469–486. https://doi.org/10.1680/daorf.27657.0017

    Chapter  Google Scholar 

  42. Wood DM (2004) Geotechnical modeling. Spon Press, Taylor and Francis Group, Milton Park

    Book  Google Scholar 

  43. Zhu X (2017) Analysis of the load sharing behavior and cushion failure mode for a disconnected piled raft. Adv Mater Sci Eng. https://doi.org/10.1155/2017/3856864

    Article  Google Scholar 

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Acknowledgement

This study was funded by the project “Improvement of S&T Infrastructure 2015 (FIST 2015)”, by Ministry of Science & Technology, Department of Science & Technology (DST), under DST Sanction No: SR/FST/ETI-401/2015.

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  1. Department of Civil Engineering, IIT Delhi, Hauz Khas, New Delhi, 110016, India

    Prasun Halder & Bappaditya Manna

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  1. Prasun Halder
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  2. Bappaditya Manna
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Correspondence to Bappaditya Manna.

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Halder, P., Manna, B. Large scale model testing to investigate the influence of granular cushion layer on the performance of disconnected piled raft system. Acta Geotech. 16, 1597–1614 (2021). https://doi.org/10.1007/s11440-020-01121-5

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