Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/55314
Title: Numerical analysis of the thermo-mechanical behavior of energy piles
Authors: Zhao, H
Cui, P
Lu, L 
Fang, Z
Keywords: Energy pileload
Load
Numerical analysis
Thermo-mechanical behavior
U-tube
Issue Date: 2014
Publisher: Springer International Publishing
Source: In I Dincer, A Midilli & H Kucuk (Eds.), Progress in sustainable energy technologies vol II : Creating sustainable development, p. 405-420. Cham: Springer International Publishing, 2014 How to cite?
Abstract: A finite element model is developed to investigate the thermomechanical behavior of the energy pile in detail. In the model, soil is regarded as a kind of thermo-elastic-perfectly plastic material, and the interaction between the pile and soil is modeled by contact elements. In order to save the computing time, the U-tubes in the energy pile are simulated by line elements, which are proved to be suitable for calculating the temperature of the pile. To deal with the thermomechanical multi-field problem, the sequential coupling method is utilized. The simulation results show that the thermally induced stress and deformation in the pile can be significantly influenced by the properties of the soil, the applied mechanical load and the restraint condition at the pile head. Long-time simulations of the energy pile with cyclic heat injections and extractions indicate that the thermal cycles would induce an unrecoverable settlement of the pile, and the ultimate bearing capacity of the energy pile may need to be redefined in view of its longtime performance.
URI: http://hdl.handle.net/10397/55314
ISBN: 9783319079776
9783319079769
DOI: 10.1007/978-3-319-07977-6_27
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