A load transfer approach for studying the cyclic behavior of thermo-active piles

Suryatriyastuti, M.E.; Mroueh, Hussein; Burlon, Sébastien

doi:10.1016/j.compgeo.2013.09.021

Cited by 100 publications

(43 citation statements)

References 21 publications

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“…To reproduce the thermally induced changes in pile behaviour seen in a field test [101], it was necessary to change the soil stiffness associated with the interface response from that required to reproduce the response under iso-thermal mechanical loading. [104] have developed a load transfer approach to the analysis of thermally-activated piles that utilise "t-z" curves broadly similar to those used by [99], and [105] adapted this model to include a function that permits cyclic degradation at the pile-soil interface, so that the potential impact of such loss of resistance on the performance of thermally-activated piles may be explored.…”

Section: Load Transfer Methodsmentioning

confidence: 99%

Analysis and design methods for energy geostructures

Bourne–Webb

Burlon²,

Javed

et al. 2016

Renewable and Sustainable Energy Reviews

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Section: Load Transfer Methodsmentioning

confidence: 99%

Analysis and design methods for energy geostructures

Bourne–Webb

Burlon²,

Javed

et al. 2016

Renewable and Sustainable Energy Reviews

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“…Loveridge and Powrie 2014;Abdelaziz and Ozudogru 2016;and Caulk et al 2016) and thermo-mechanical aspect. (Bourne-Webb et al 2009;Knellwolf et al 2011;Amatya et al 2012;Suryatriyastuti et al 2014;Chen et al 2016). This paper focused on the latter case.…”

Section: Introductionmentioning

confidence: 99%

Investigations of pile–soil interaction under thermo-mechanical loading

Rui

Yin

2018

Can. Geotech. J.

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Thermo-active piles that couple load bearing with ground source heat pump systems are one of the new technologies in geotechnical engineering. This paper investigates the pile–soil interaction behaviour of a thermo-active pile in overconsolidated London clay by conducting a thermo-hydro-mechanical finite element analysis using an advanced soil constitutive model. Negative and positive excess pore pressures are computed around the pile during cooling and heating, respectively. However, the difference in the radial effective stress acting on the pile–soil interface between the cooling and heating stages is small, and the pile–soil interaction is governed by the shear mobilization associated with thermally induced cyclic movements of pile expansion and contraction. During the first cooling stage, the shear stress at a small portion in the upper part of the pile reaches close to the yield values, which leads to an additional settlement about 3 mm from the original mechanical load–induced settlement of 2 mm. The shear stresses in subsequent heating and cooling cycles are much smaller than the ultimate shear stress values, because of the heavily overconsolidated nature of the London clay.

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“…For example, Knellwolf et al (2011), McCartney andRosenberg (2011) and Suryatriyastuti et al (2014) used the load transfer (t-z) approach, which includes the effect of thermal expansion and contraction of the pile. The finite-element method has been employed by Laloui et al (2006), Suryatriyastuti et al (2012), Bodas Freitas et al (2013), Dupray et al (2014), Di Donna and Laloui (2015), Rotta Loria et al (2015), Salciarini et al (2015), Bourne-Webb et al (2016) and Di Donna et al (2016), among others.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of thermo-active piles in London Clay

Gawecka

Taborda

Potts

et al. 2017

Proceedings of the Institution of Civil Engineers - Geotechnica

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Thermo-active foundations utilise heat energy stored in the ground to provide a reliable and effective means of space heating and cooling. Previous studies have shown that the effects of temperature changes on their response are highly dependent on their interaction with the surrounding ground. Consequently, it is necessary to consider this interaction and include both the thermal and mechanical behaviour of the ground in design. This paper addresses this issue by performing state-of-the-art finite-element analyses using the Imperial College Finite Element Program, which is capable of simulating the fully coupled thermo-hydro-mechanical behaviour of porous materials. First, the Lambeth College pile test is analysed to demonstrate the capability of the adopted modelling approach to capture the observed response under thermo-mechanical loading. Subsequently, a detailed study is carried out, demonstrating the impact of capturing the fully coupled thermo-hydro-mechanical response of the ground, the use of appropriate boundary conditions and the uncertainty surrounding thermal ground properties. It is demonstrated that the modelling approach has a large impact on the computed results, and therefore potentially on the design of thermo-active piles. Conversely, the effects of thermal conductivity and permeability of the soil are shown not to influence the pile behaviour significantly.

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A load transfer approach for studying the cyclic behavior of thermo-active piles

Cited by 100 publications

References 21 publications

Analysis and design methods for energy geostructures

Analysis and design methods for energy geostructures

Investigations of pile–soil interaction under thermo-mechanical loading

Numerical modelling of thermo-active piles in London Clay

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