Numerical Modelling of Energy Pile by Different Constitutive Models

Written by Gouw Tjie Liong, Ir., M.Eng, ChFC, PhD. Posted in Geotechnic, GTL Paper, Publication


ABSTRACT: Energy pile is an innovative technology which combined foundation pile with heat pumps. Through this integration, foundation pile can then serve as cooling and heating system, in summer and winter, respectively. During energy pile operation, the pile is subjected to heating and cooling cycles. The thermal cycles induce thermal-induced settlement, and predicting this settlement is a major challenge. As the thermal loading of energy pile is cyclic in nature, constitutive model capable of modelling cyclic hysteresis is necessary. In this paper, a model energy pile embedded in saturated sand and subjected to 5 thermal cycles are back-analyzed using hardening soil with small strain stiffness model. To highlight the importance of modelling cyclic hysteresis, two constitutive models which cannot model the cyclic hysteresis, i.e. hardening soil model and Mohr Coulomb model are used to back analyse the same test. Results show that hardening soil with small strain stiffness model can model the test reasonably well, while hardening soil and Mohr coulomb model severely underestimate the thermal-induced settlement.
Download full paper: http://indogeotek.com/wp-content/uploads/2019/11/AG-191014-16ARC-Taipei-Numerical-Model-of-Energy-Pile.pdf

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Gouw Tjie Liong, Ir., M.Eng, ChFC, PhD

Dr. Gouw is a certified Professional Geotechnical Engineer. He has been working in the field of Geotechnical Engineering since 1984. His expertise covering geotechnical investigation, soil instrumentation, deep foundation and excavation for high rise buildings, pile load testing (Static and PDA), pile integrity testing (PIT), sonic logging test, vibration monitoring, slope stability, ground anchors, pumping test, dewatering, micropiles, tunnelling and ground improvement works, e.g. dynamic compaction, vertical drain, vibro-compaction, geosynthetic and grouting. The jobs cover more than 180 projects in Indonesia, Singapore and Srilanka. He has a great passion in the teaching and disseminating of geotechnical engineering knowledge. He serves as lecturer since late 1984. Currently, he serves as Associate Professor at Podomoro University, Jakarta for undergraduate study, and for post graduate students at Universitas Katolik Parahyangan, Bandung, Indonesia. He also conduct regular geotechnical training for engineers. He also chaired the Indonesian Chapter of International Geosynthetics Society since 2006. He has published 80 papers and 22 technical notes.

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