Date

2017

Document Type

Dissertation

Degree

Doctor of Philosophy

Department

Civil Engineering

First Adviser

Suleiman, Muhannad T.

Other advisers/committee members

Pamukcu, Sibel; Neti, Sudhakar; Pervizpour, Mesut

Abstract

Energy piles provide sustainable energy alternative to transfer the heat for bridge anti-icing, which support the structural loads and exchange heat with surrounding soils using closed-loop ground source heat pump (GSHP) systems. However, the application potential of energy piles for bridge anti-icing has not been fully explored for different climate conditions. Moreover, GSHPs connected to energy piles operates in cycles where it functions for a period of time (running time) then stops for another period of time (stoppage time). This intermittent operation subjects the piles and surrounding soil to changes of temperature and temperature cycles. The temperature change and cycles result in cyclic displacement (expansion and contraction) in both axial and radial directions of the pile and alter soil properties. Researches have investigated the effects of pile axial expansion and contraction (considering the end-restraint) on shear stresses at the soil-pile interface and on axial stresses in the pile. However, the effects of thermally-induced radial expansion and contraction and their cyclic effects on the soil-foundation interaction for energy piles have not been fully investigated. Furthermore, there is no laboratory or field method to investigate the cyclic temperature effect on the soil-pile interface response and to simulate the radial expansion and contraction of energy piles.The goal of the research presented in this dissertation focuses on: (1) investigating application of geothermal potential energy (energy piles) for bridge anti-icing using numerical analysis of bridge heat transfer model; (2) investigating cyclic thermo-mechanical response of soil-concrete interfaces of different roughness subjected to temperature change and cycles using a modified direct shear tests; (3) developing Modified Thermal-Borehole Shear Tests (Modified-TBSTs) in normally-consolidated soil to investigate the effects of temperature cycles and radial expansion/contraction displacement cycles on the soil-energy pile interaction.

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