Advertisement

Strain Distribution in Geothermal Energy Piles: A Parametric Study

  • Rajni SagguEmail author
Conference paper
Part of the Environmental Science and Engineering book series (ESE)

Abstract

This work emphasizes on the alteration in pile-soil interaction in case of geothermal energy piles during thermal cycle. The geothermal energy piles are investigated numerically using finite element software Abaqus. To simulate the soil mechanical and thermal response, two user defined material subroutines are used for the soil surrounding the piles. The behaviour of soil is reproduced using CASM; a soil constitutive model which is based on the concepts of critical state soil mechanics. To investigate the additional strains induced in the piles due to the thermal load, parametric analyses are carried out considering the effect of (i) different pile end restraints, (ii) relative densities of the soil, (iii) pile dimensions and (iv) lateral earth pressure coefficient. The analysis results indicate that the axial and radial strains are induced in the pile due to pile expansion during thermal loading. The increase in lateral earth pressure coefficient at interface of pile and soil can be correlated to the thermally induced radial strains. Moreover, the pile response to the thermal cycle can be considered to the governed by soil stiffness and the magnitude of thermal load applied on the pile. Analyses are also performed to investigate the influence of thermal parameters of soil and thermal load on the soil earth pressure coefficient at interface of pile and soil. The lateral earth pressure coefficient increases following the increase in magnitude of thermal load, however the effect of thermal conductivity of soil is not significant.

Keywords

Geothermal Axial and radial strains Lateral earth pressure coefficient 

References

  1. Bourne-Webb PJ, 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):237–248CrossRefGoogle Scholar
  2. Saggu R, Chakraborty T (2015) Cyclic thermo-mechanical analysis of energy piles in sand. Geotech Geol Eng 33(2):321–342CrossRefGoogle Scholar
  3. Saggu R, Chakraborty T (2017) Thermo-mechanical response of geothermal energy piles in sand and parametric study. Int J Geomech 17(9).  https://doi.org/10.1061/(ASCE)GM.1943-5622.0000962CrossRefGoogle Scholar
  4. Sasitharan S, Robertson PK, Sego DC, Morgenstern NR (1994) State-boundary surface for very loose sand and its practical implications. Can Geotech J 31(3):321–334CrossRefGoogle Scholar
  5. Tarnawski VR, Momose T, Leong WH, Bovesecchi G, Coppa P (2009) Thermal conductivity of standard sands. Part I. Dry state conditions. Int J Thermophys 30(3):949–968CrossRefGoogle Scholar
  6. Wang B, Bouazza A, Singh RM, Haberfield C (2015) Post temperature effects on shaft capacity of a full scale geothermal energy pile. J Geotech Geoenvironmental Eng 141(4).  https://doi.org/10.1061/(ASCE)GT.1943-5606.0001266CrossRefGoogle Scholar
  7. Yu HS, Tan SM, Schnaid F (2007) A critical state framework for modelling bonded geomaterials. Geomech Geoengin Int J 2(1):61–74CrossRefGoogle Scholar
  8. Yu HS (2006) Plasticity and geotechnics. Springer, New YorkzbMATHGoogle Scholar
  9. Carraro JAH (2006) Mechanical behaviour of silty and clayey sands. Ph.D. thesis, Purdue University, West Lafayette, USAGoogle Scholar
  10. Goode JC III, Zhang M, McCartney JS (2014) Centrifuge modeling of energy foundations in sand. In: Gaudin C, White D (eds) Proceedings of 8th international conference on physical modelling in geotechnics. Taylor and Francis, London, pp 729–736Google Scholar
  11. Laloui L, Nuth M (2006) Numerical modeling of some features of heat exchanger piles. In: Proceedings of GeoShanghai international conference on Foundation analysis and design: innovative methods (GSP 153), Shanghai, China, pp 189–194Google Scholar
  12. Wang B, Bouazza A, Singh RM, Barry DM, Haberfield C, Chapman G, Baycan S (2013) Field investigation of geothermal energy pile: initial observations. In: Proceedings of the 18th international conference on soil mechanics and geotechnical engineering, pp 3415–3418Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringGalgotias College of Engineering and TechnologyGreater NoidaIndia

Personalised recommendations