Thermomechanical Response of Geothermal Energy Pile Groups in Sand
Publication: International Journal of Geomechanics
Volume 16, Issue 4
Abstract
The thermomechanical response of geothermal energy pile groups in sand was studied in the present work by using a three-dimensional nonlinear finite-element analysis procedure. A raft was considered on the piles. The stress-strain responses of the piles and raft were considered linear elastic. The stress-strain response of sand was reproduced by using the state parameter-based constitutive clay and sand model (CASM). The CASM was implemented in finite-element software through a user-defined material subroutine. The geothermal energy pile group was analyzed for different combinations of thermal and nonthermal piles in the group in a single layer of sand. Analysis results were studied for the displacement at the base of the pile and the axial stresses in the pile. Parametric sensitivity studies were performed by varying the spacing between the piles. It can be observed from the results that the geothermal piles, when subjected to heating, exhibit higher displacement and axial stress than the piles under only mechanical loading. Differential settlement at the pile base was observed for the groups that contained both thermal and nonthermal piles.
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Acknowledgments
The authors acknowledge the financial support provided by Science and Engineering Research Council (SERC), Department of Science and Technology (DST), and Government of India for performing the work reported in this paper.
References
Abaqus [Computer software]. SIMULIA, Providence, RI.
Amatya, B. L., Soga, K., Bourne Webb, P. J., Amis, T., and Laloui, L. (2012). “Thermo-mechanical behaviour of energy piles.” Géotechnique, 62(6), 503–519.
ASTM. (2006) “Standard specification for standard sand.” C778, West Conshohocken, PA.
Basu, P., Loukidis, D., Prezzi, M., and Salgado, R. (2011). “Analysis of shaft resistance of jacked piles in sand.” Int. J. Numer. Anal. Methods Geomech., 35(15), 1605–1635.
Been, K., and Jefferies, M. G. (1985). “A state parameter for sands.” Géotechnique, 35(2), 99–112.
Boënnec, O. (2009). “Piling on the energy.” GeoDrilling Int., 2009, 25–28.
Bolton, M. D., Dasari, G. R., and Britto, A. M., (1994). “Putting small-strain non-linearity into modified Cam-clay model.” Proc., 8th Int. Conf. on Computer Methods and Advances in Geomechanics. Morgantown, WV, 537–542.
Bouazza, A., and Adam, D. (2012). “Turning geostructures into sources of renewable energy.” ANZ 2012 Conf. Proc., Australian Geomechanics Society, Melbourne, Australia, 1051–1056.
Bourne-Webb, P. J., Amatya, B. L., and Soga, K., (2013). “A framework for understanding energy pile behavior.” Proc., Institution of Civil Engineering, Geotech. Eng., 166(2), 170–177.
Bourne-Webb, P. J., Amatya, B., Soga, K., Amis, T., Davidson, C., and 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.
Brandl, H. (2006). “Energy foundations and other thermo-active ground structures.” Géotechnique, 56(2), 81–122.
Brettmann, T., and Amis, T. (2011). “Thermal conductivity evaluation of a pile group using geothermal energy piles.” Geo-Frontiers, 499–508.
Carraro, J. A. H. (2006). “Mechanical behavior of silty and clayey sands.” Ph.D. dissertation, Purdue Univ., West Lafayette, IN.
Cekerevac, C., and 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.
De Moel, M., Bach, P. M., Bouazza, A., Rao, R. M., and Sun, J. O. (2010). “Technological advances and applications of geothermal energy pile foundations and their feasibility in Australia.” Renewable Sustainable Energy Rev., 14(9), 2683–2696.
Dupray, F., Laloui, L., and Kazangba., A. (2014). “Numerical analysis of seasonal heat storage in an energy pile foundation.” Comput. Geotech., 55, 67–77.
Graham, J., Alfaro, M., and Ferris, G. (2004). “Compression and strength of dense sand at high pressures and elevated temperatures.” Can. Geotech. J., 41(6), 1206–1212.
Green, A. E., and Naghdi, P. M. (1992). “On undamped heat waves in an elastic solid.” J. Therm. Stresses, 15(2), 253–264.
Ground Source Heat Pump Association (GSHP). (2012). Thermal pile design, installation and materials standards. National Energy Centre, Milton Keynes, U.K.
Karner, S. L., Kronenberg, A. K., Chester, F. M., Chester, J. S., and Hajash, A. (2008). “Hydrothermal deformation of granular quartz sand.” J. Geophys. Res., 113, B05404.
Knellwolf, C., Peron, H., and Laloui, L. (2011). “Geotechnical analysis of heat exchanger piles.” J. Geotech. Geoenviron. Eng., 890–902.
Koene, F., and Geelen, C. (2000). “Energy piles as an efficient way to store heat.” CADDET Energy Efficiency. Special issue on Netherlands 2000, Energy Research Centre of the Netherlands, Petten, the Netherlands.
Laloui, L., Moreni, M., and Vulliet, L. (2003). “Comportement d’un pieu bi-fonction, fondation et échangeur de chaleur.” Can. Geotech. J., 40(2), 388–402 (in French).
Laloui, L., Nuth, M., and 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.
Loukidis, D. (2006). “Advanced constitutive modeling of sands and applications to foundation engineering.” Ph.D. dissertation, Purdue Univ., West Lafayette, IN.
McCartney, S. J. (2011). “Engineering performance of energy foundations.” Proc., Pan-Am CGS Geotechnical Conf., Toronto, Canada.
Murthy, T. G., Loukidis, D., Carraro, J. A. H., Prezzi, M., and Salgado, R. (2006). “Undrained monotonic response of clean and silty sands.” Géotechnique, 57(3), 273–288.
Mylonakis, G., and Gazetas, G. (1998). “Settlement and additional internal forces of grouped piles in layered soil.” Géotechnique, 48(1), 55–72.
Nemat-Nasser, S., and Okada, N. (2001). “Radiographic and microscopic observation of shear bands in granular materials.” Géotechnique, 51(9), 753–765.
Ortiz, M., and Simo, J. C. (1986). “An analysis of a new class of integration algorithms for elastoplastic constitutive relations.” Int. J. Numer. Methods Eng., 23(3), 353–366.
Pahud, D., and Hubbuch, M. (2007). “Measured thermal performance of the energy pile system of the dock midfield of Zürich airport.” Proc., European Geothermal Congress 2007, Unterhaching, Germany.
Peron, H., Knellwolf, C., and Laloui, L. (2011). “A method for the geotechnical design of heat exchanger piles.” Geo-Frontiers, 1, 470–479.
Poulos, H. G. (2001). “Piled raft foundations: design and applications.” Géotechnique, 51(2), 95–113.
Randolph, M. F., and Wroth, C. P. (1978). “Analysis of vertical deformation of vertically loaded piles.” J. Geotech. Eng. Div., 104(12), 1465–1488.
Rowe, P. W. (1962). “The stress dilatancy relationships for static equilibrium of an assembly of particles in contact.” Proc. R. Soc. London, Ser. A., 269(1339), 500–529.
Rowe, P. W. (1971). “Theoretical meaning and observed values of deformation parameters for soil.” Proc., Roscoe Memorial Symp. on Stress-Strain Behaviour of Soils., Univ. of Cambridge, Cambridge, U.K., 143–194.
Saggu, R., and Chakraborty, T. (2014). “Thermal analysis of energy piles in sand.” Geomech. Geoeng., 10(1), 10–29.
Salciarini, D., Ronchi, F., Cattoni, E., and Tamagnini, C. (2013). “Thermomechanical effects induced by energy piles operation in a small piled raft.” Int. J. Geomech., 04014042.
Salgado, R. (2008). Engineering of foundations, McGraw-Hill, New York.
Sanner, B., Mands, E., and Sauer, M. K. (2003). “Larger geothermal heat pump plants in the central region of Germany.” Geothermics, 32(4–6), 589–602.
Sasitharan, S., Robertson, P. K., Sego, D. C., and Morgenstern, N. R. (1994). “State-boundary surface for very loose sand and its practical implications.” Can. Geotech. J., 31(3), 321–334.
Tarnawski, V. R., Momose, T., Leong, W. H., Bovesecchi, G., and Coppa, P. (2009). “Thermal conductivity of standard sands. Part I. Dry state conditions.” Int. J. Thermophys., 30(3), 949–968.
Uesugi, M., Kishida, H., and Tsubakihara, Y. (1988). “Behaviour of sand particles in sand-steel friction.” Soils Found., 28(1), 107–118.
Vardoulakis, I., and Sulem, J. (1995). Bifurcation analysis in geomechanics, Blackie Academic and Professional, Glasgow, U.K.
Yu, H. S. (1998). “CASM: A unified state parameter model for clay and sand.” Int. J. Numer. Anal. Methods Geomech., 22(8), 621–653.
Yu, H. S. (2006). Plasticity and geotechnics, Springer, New York.
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Published In
International Journal of Geomechanics
Volume 16 • Issue 4 • August 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 19, 2014
Accepted: Jun 24, 2015
Published online: Jan 11, 2016
Discussion open until: Jun 11, 2016
Published in print: Aug 1, 2016
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