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Thermo-hydro-mechanical response of a large piled raft equipped with energy piles: a parametric study

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Abstract

This paper presents the results of a parametric study in which a series of fully coupled, 3-dimensional thermo-hydro-mechanical Finite Element (FE) analyses has been conducted to investigate the effects of the thermal changes imposed by the regular performance of a GSHP system driven by energy piles on a very large piled raft. The FE simulation program has been focused mainly on the evaluation of the following crucial aspects of the energy system design: the assessment of the soil–pile–raft interaction effects during thermal loading conditions; the quantification of the influence of the thermal properties of the soil and of the geometrical layout of the energy piles on the soil–foundation system response, and the evaluation of the influence of the active pile spacing on the thermal performance of the GSHP–energy pile system. The results of the numerical simulations show that the soil–pile–raft interaction effects can be very important. In particular, the presence of a relatively rigid raft in direct contact with the soil is responsible for axial load variations in inactive piles of the same order of those experienced by the thermo-active piles, even when the latter are relatively far and temperature changes in inactive piles are small. As far as the effect of pile spacing is concerned, the numerical simulations show that placing a high number of energy piles in a large piled raft with relatively small pile spacings can lead to a significant reduction of the overall heat exchange from the piles to the soil, thus reducing the thermal efficiency of the system.

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References

  1. Adam D, Markiewicz R (2009) Energy from earth-coupled structures, foundations, tunnels and sewers. Géotechnique 59(3):229–236

    Article  Google Scholar 

  2. Akrouch GA, Sánchez M, Briaud JL (2014) Thermo-mechanical behavior of energy piles in high plasticity clays. Acta Geotech 9(3):399–412

    Article  Google Scholar 

  3. Ascher UM, Petzold LR (1998) Computer methods for ordinary differential equations and differential-algebraic equations. Siam, Philadelphia

    Book  MATH  Google Scholar 

  4. Baldi G, Hueckel T, Pellegrini R (1988) Thermal volume changes of mineral-water system in low porosity clay soils. Can Geotech J 25(4):807–825

    Article  Google Scholar 

  5. Batini N, Rotta Loria AF, Conti P, Testi D, Grassi W, Laloui L (2015) Energy and geotechnical behaviour of energy piles for different design solutions. Appl Therm Eng 86:199–213

    Article  Google Scholar 

  6. Bodas Freitas T, Cruz Silva F, Bourne-Webb P (2013) The response of energy foundations under thermo-mechanical loading. In: Proceedings of 18th international conference on soil mechanics and geotechnical engineering, pp 3347–3350

  7. Bourne-Webb P, Amatya B, Soga K, Amis T, Davidson C, Payne P (2009) Energy pile test at lambeth college, london: geotechnical and thermodynamic aspects of pile response to heat cycles. Géotechnique 59(3):237–248

    Article  Google Scholar 

  8. Bourne-Webb P, Bodas Freitas T, Freitas Assunção R (2015) Soil–pile thermal interactions in energy foundations. Géotechnique 66(2):167–171

    Article  Google Scholar 

  9. Brandl H (2006) Energy foundations and other thermo-active ground structures. Géotechnique 56(2):81–122

    Article  Google Scholar 

  10. Burghignoli A, Desideri A, Miliziano S (2000) A laboratory study on the thermomechanical behaviour of clayey soils. Can Geotech J 37:764–780

    Article  Google Scholar 

  11. Campanella RG, Mitchell JK (1968) Influence of temperature variations on soil behavior. J Soil Mech Found Div ASCE 94(SM3):709–734

    Google Scholar 

  12. Cekerevac C, Laloui L (2004) Experimental study of thermal effects on the mechanical behaviour of a clay. Int J Numer Anal Methods Geomech 28(3):209–228

    Article  Google Scholar 

  13. Comsol (2014) COMSOL Multiphysics version 4.4: user's guide and reference manual. Comsol, Burlington

  14. Di Donna A, Laloui L (2015) Numerical analysis of the geotechnical behaviour of energy piles. Int J Numer Anal Methods Geomech 39(8):861–888

    Article  Google Scholar 

  15. Di Donna A, Loria AFR, Laloui L (2016) Numerical study of the response of a group of energy piles under different combinations of thermo-mechanical loads. Comput Geotech 72:126–142

    Article  Google Scholar 

  16. Dickson MH, Fanelli M (2004) Cos’é l’energia geotermica? Istituto di Geoscienze e Georisorse, CNR, Pisa, pp 8–16

  17. Goode J III, McCartney JS (2015) Centrifuge modeling of boundary restraint effects in energy foundations. J Geotech Geoenviron Eng 141(8):04015034

    Article  Google Scholar 

  18. Heard HC (1960) Transition from brittle failure to ductile flow in Solnhofen limestone as a function of temperature, confining pressure and interstitial fluid pressure. In: Griggs J, Handin JE (eds) Rock deformation, vol 79. The Geological Society of America, Memoir, pp 193–226

    Chapter  Google Scholar 

  19. Hueckel T, Baldi G (1990) Thermoplasticity of saturated clays: experimental constitutive study. J Geotech Eng ASCE 116(12):1778–1796

    Article  Google Scholar 

  20. Hueckel T, Pellegrini R (1992) Effective stress and water pressure in saturated clays during heating–cooling cycles. Can Geotech J 29:1095–1102

    Article  Google Scholar 

  21. Jeong S, Lim H, Lee JK, Kim J (2014) Thermally induced mechanical response of energy piles in axially loaded pile groups. Appl Therm Eng 71(1):608–615

    Article  Google Scholar 

  22. Johnston I, Narsilio G, Colls S (2011) Emerging geothermal energy technologies. KSCE J Civ Eng 15(4):643–653

    Article  Google Scholar 

  23. Katzenbach R, Ramm H, Waberseck T (2009) Recent developments in foundation and geothermal engineering. In: 2nd international conference on new developments in soils mechanics and geotechnical engineering, pp 18–30

  24. Laloui L, Di Donna A (2013) Energy geostructures: innovation in underground engineering. Wiley, New Jersey

    Book  Google Scholar 

  25. Laloui L, Nuth M, Vulliet L (2006) Experimental and numerical investigations of the behaviour of a heat exchanger pile. Int J Numer Anal Methods Geomech 30(8):763–781

    Article  Google Scholar 

  26. Lewis RW, Schrefler BA (1998) The finite element method in the deformation and consolidation of porous media, 2nd edn. Wiley, New Jersey

    MATH  Google Scholar 

  27. Mimouni T, Laloui L (2015) Behaviour of a group of energy piles. Can Geotech J 52(12):1913–1929

    Article  Google Scholar 

  28. Mitchell JK, Soga K (2005) Fundamentals of soil behavior, 3rd edn. Wiley, New Jersey

    Google Scholar 

  29. Murphy K, McCartney JS (2014) Seasonal response of energy foundations during building operation. Geotech Geol Eng 33(2):343–356

    Article  Google Scholar 

  30. Murphy KD, McCartney JS, Henry KS (2015) Evaluation of thermo-mechanical and thermal behavior of full-scale energy foundations. Acta Geotech 10(2):179–195

    Article  Google Scholar 

  31. Ng CWW, Shi C, Gunawan A, Laloui L (2014) Centrifuge modelling of energy piles subjected to heating and cooling cycles in clay. Geotech Lett 4(4):310–315

    Article  Google Scholar 

  32. Nova R, Castellanza R, Tamagnini C (2004) A constitutive model for mechanical and thermal loading of bonded geomaterials based on the concept of plasticity with extended hardening. In: Proceedings of 9th symposium on numerical models in geomechanics (NUMOG IX), pp 51–56

  33. Olgun C, Abdelaziz S, Martin J (2012) Long-term performance and sustainable operation of energy piles. In: Proceedings of ICSDEC 2012: developing the frontier of sustainable design, engineering, and construction, ASCE Reston, VA, pp 534–542

  34. Rotta Loria AF, Laloui L (2016) Thermally induced group effects among energy piles. Géotechnique 67(5):374–393

    Article  Google Scholar 

  35. Salciarini D, Ronchi F, Cattoni E, Tamagnini C (2013) Thermomechanical effects induced by energy piles operation in a small piled raft. Int J Geomech 15(2):04014,042

    Article  Google Scholar 

  36. Stewart MA, McCartney JS (2014) Centrifuge modeling of soil-structure interaction in energy foundations. J Geotech Geoenviron Eng 140(4):04013,044

    Article  Google Scholar 

  37. Suryatriyastuti M, Burlon S, Mroueh H (2016) On the understanding of cyclic interaction mechanisms in an energy pile group. Int J Numer Anal Methods Geomech 40(1):3–24

    Article  Google Scholar 

  38. Wang W, Regueiro RA, Stewart M, McCartney JS (2012) Coupled thermo-poro-mechanical finite element analysis of an energy foundation centrifuge experiment in saturated silt. In: GeoCongress 2012, American Society of Civil Engineers, pp 4406–4415

  39. Wang W, Regueiro RA, McCartney JS (2015) Coupled axisymmetric thermo-poro-mechanical finite element analysis of energy foundation centrifuge experiments in partially saturated silt. Geotechn Geol Eng 33(2):373–388

    Article  Google Scholar 

  40. You S, Cheng X, Guo H, Yao Z (2016) Experimental study on structural response of cfg energy piles. Appl Therm Eng 96:640–651

    Article  Google Scholar 

Download references

Acknowledgements

The financial support of the Project “TIAR–Edilizia Rurale Innovativa Sostenibile con Autonomia Energetica”, funded by the Italian “Ministero delle Politiche Agricole Alimentari e Forestali” is gratefully acknowledged. The Authors wish to thank Ms. Francesca Brunori for the support provided in performing part of the numerical simulations program.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125, Perugia, Italy

    Diana Salciarini, Federica Ronchi & Claudio Tamagnini

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  1. Diana Salciarini
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  2. Federica Ronchi
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  3. Claudio Tamagnini
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Correspondence to Diana Salciarini.

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Salciarini, D., Ronchi, F. & Tamagnini, C. Thermo-hydro-mechanical response of a large piled raft equipped with energy piles: a parametric study. Acta Geotech. 12, 703–728 (2017). https://doi.org/10.1007/s11440-017-0551-3

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  • DOI: https://doi.org/10.1007/s11440-017-0551-3

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