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Pile-Soil Interactions under Thermo-Mechanical Conditions Imposed by Geothermal Energy Piles in Sand
The load transfer mechanism of the geothermal energy piles involves thermal soil-structure interaction. In the present work, pile-soil interaction is investigated for the energy piles using axisymmetric nonlinear finite element analysis procedure. For the analyses carried out herein, the stress-strain response of piles is considered to be linear-elastic. The stress-strain response of sand is simulated using state parameter based constitutive model CASM. The CASM model is implemented in finite element software Abaqus through user material subroutine. Floating geothermal energy piles of different lengths and diameters in sand are analyzed under allowable axial loading and thermal loading. Two types of sands namely Ottawa sand and Toyoura sand are considered for analyses. The shear stress in soil at the pile-soil interface is studied. In addition, parametric sensitivity studies are performed by varying relative density of sand and coefficient of earth pressure of sand. It has been observed from the results that pile length, relative density of the soil and the axial load magnitude are the key parameters in deciding the load-displacement response of geothermal energy piles subjected to thermo-mechanical loading. Moreover, the soil particle shape and size also affect the magnitude of shear stress in soil at pile-soil interface. Negative shear stress generates at the pile-soil interface when subjected to thermal loading which causes the drag load on the pile.
Pile-Soil Interactions under Thermo-Mechanical Conditions Imposed by Geothermal Energy Piles in Sand
The load transfer mechanism of the geothermal energy piles involves thermal soil-structure interaction. In the present work, pile-soil interaction is investigated for the energy piles using axisymmetric nonlinear finite element analysis procedure. For the analyses carried out herein, the stress-strain response of piles is considered to be linear-elastic. The stress-strain response of sand is simulated using state parameter based constitutive model CASM. The CASM model is implemented in finite element software Abaqus through user material subroutine. Floating geothermal energy piles of different lengths and diameters in sand are analyzed under allowable axial loading and thermal loading. Two types of sands namely Ottawa sand and Toyoura sand are considered for analyses. The shear stress in soil at the pile-soil interface is studied. In addition, parametric sensitivity studies are performed by varying relative density of sand and coefficient of earth pressure of sand. It has been observed from the results that pile length, relative density of the soil and the axial load magnitude are the key parameters in deciding the load-displacement response of geothermal energy piles subjected to thermo-mechanical loading. Moreover, the soil particle shape and size also affect the magnitude of shear stress in soil at pile-soil interface. Negative shear stress generates at the pile-soil interface when subjected to thermal loading which causes the drag load on the pile.
Pile-Soil Interactions under Thermo-Mechanical Conditions Imposed by Geothermal Energy Piles in Sand
Saggu, Rajni (author) / Chakraborty, Tanusree (author)
Fourth Geo-China International Conference ; 2016 ; Shandong, China
Geo-China 2016 ; 41-48
2016-07-21
Conference paper
Electronic Resource
English
Pile-Soil Interactions under Thermo-Mechanical Conditions Imposed by Geothermal Energy Piles in Sand
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