Probabilistic design model for energy piles considering soil spatial variability

Abstract Energy piles are sustainable green foundations. Although several geotechnical design methods have been proposed, no methods have yet been developed to quantify the uncertainty propagation in thermo-mechanical pile-soil interactions. The probabilistic model proposed in this paper, which is based on load-transfer curves, considers the effects of spatial variability for energy pile design. The developed random finite difference method is used to address the effects of vertical spatial variability on the ultimate limit state design and serviceability limit state design. This study points to the necessity of modeling the soil spatial variability in the thermo-mechanical pile-soil interactions in energy piles.

[1]  Bengt H. Fellenius,et al.  Down-drag on piles in clay due to negative skin friction , 1972 .

[2]  K. D. Murphy,et al.  Investigation of potential dragdown/uplift effects on energy piles , 2017 .

[3]  Erik H. Vanmarcke,et al.  Random Fields: Analysis and Synthesis. , 1985 .

[4]  Sherif L. Abdelaziz,et al.  Long-term performance of heat exchanger piles , 2015 .

[5]  Lymon C. Reese,et al.  Load Transfer for Axially Loaded Piles in Clay , 1966 .

[6]  Ilknur Bozbey,et al.  Correlation of standard penetration test and pressuremeter data: a case study from Istanbul, Turkey , 2010 .

[7]  Roger Frank,et al.  ESTIMATION PAR LES PARAMETRES PRESSIOMETRIQUES DE L'ENFONCEMENT SOUS CHARGE AXIALE DE PIEUX FORES DANS DES SOLS FINS , 1982 .

[8]  C. Olgun,et al.  Cyclic Load–Transfer Approach for the Analysis of Energy Piles , 2019, Journal of Geotechnical and Geoenvironmental Engineering.

[9]  Hussein Mroueh,et al.  A load transfer approach for studying the cyclic behavior of thermo-active piles , 2014 .

[10]  M. Moreni,et al.  Comportement d'un pieu bi-fonction, fondation et échangeur de chaleur , 2003 .

[11]  A. Tang,et al.  Preliminary study on the mechanical behaviour of heat exchanger pile in physical model , 2012 .

[12]  C. Ng,et al.  Centrifuge modelling of heating effects on energy pile performance in saturated sand , 2015 .

[13]  Lyesse Laloui,et al.  Geotechnical Analysis of Heat Exchanger Piles , 2011 .

[14]  K. Terzaghi,et al.  Soil mechanics in engineering practice , 1948 .

[15]  Hideki Hirayama,et al.  Load-settlement analysis for bored piles using hyperbolic transfer functions. , 1990 .

[16]  Lyesse Laloui,et al.  Numerical analysis of the geotechnical behaviour of energy piles , 2015 .

[17]  Lei Wang,et al.  Probabilistic geotechnical analysis of energy piles in granular soils , 2016 .

[18]  Fred H. Kulhawy,et al.  Manual on estimating soil properties for foundation design , 1990 .

[19]  Alec Westley Skempton,et al.  Cast In-Situ Bored Piles in London Clay , 1959 .

[20]  P. J. Bourne-Webb,et al.  Soil–pile thermal interactions in energy foundations , 2016 .

[21]  D. V. Griffiths,et al.  Risk Assessment in Geotechnical Engineering , 2008 .

[22]  Osman Sivrikaya,et al.  Determination of undrained strength of fine-grained soils by means of SPT and its application in Turkey , 2006 .

[23]  C. Haberfield,et al.  Axial and Radial Thermal Responses of a Field-Scale Energy Pile under Monotonic and Cyclic Temperature Changes , 2018, Journal of Geotechnical and Geoenvironmental Engineering.

[24]  Bengt H. Fellenius,et al.  Results from long-term measurement in piles of drag load and downdrag , 2006 .

[25]  J. McCartney,et al.  Parameters for Load Transfer Analysis of Energy Piles in Uniform Nonplastic Soils , 2017 .

[26]  C. Ng,et al.  Model tests of energy piles with and without a vertical load , 2016 .

[27]  T. Chakraborty,et al.  Thermomechanical Analysis and Parametric Study of Geothermal Energy Piles in Sand , 2017 .

[28]  M. A. Stroud,et al.  The standard penetration test in insensitive clays and soft rocks , 1975 .

[29]  Lei Wang,et al.  Reliability-Based Geotechnical Design of Geothermal Foundations , 2017 .

[30]  A. Tang,et al.  Mechanical behaviour of a small-scale energy pile in saturated clay , 2016 .

[31]  K. Soga,et al.  Energy pile test at Lambeth College, London: geotechnical and thermodynamic aspects of pile response to heat cycles , 2009 .