Emerging Thermal Issues in Geotechnical Engineering

McCartney, John S.; Jafari, Navid H.; Hueckel, Tomasz; Sánchez, Marcelo; Vahedifard, Farshid

doi:10.1007/978-3-030-06249-1_10

Cited by 18 publications

(4 citation statements)

References 230 publications

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“…Although the first studies on the effects of temperature on the engineering behaviour of soils date back to the 50s and 60s (see the historical perspective provided by Laloui and Cekerevac 2003;McCartney et al 2019), some of the mechanisms of thermal volume change remain to be understood. The lack of information about loading sequences is one of the main causes that prevent complete understanding.…”

Section: Thermovolumetric Behaviour Of Fine-grained Soilsmentioning

confidence: 99%

“…Most of the available research and literature that started in those years and developed until more recent times focuses mainly on the design of repositories for radioactive waste disposal in deep geological media and the consequent development of advanced thermo-hydro-mechanical constitutive models to provide long-term nuclear waste management solutions (e.g., . Starting from the 2000s, there has been an interest in environmentally friendly technologies capable of addressing climate change challenges, such as energy geostructures and other thermoactive ground structures (McCartney et al 2019;Laloui and Rotta Loria 2019). Understanding the behaviour of soil-structure interfaces is critical to address the analysis and design of energy geostructures, e.g., the analysis of energy pile capacity subjected to cyclic thermal loads.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic thermomechanical response of fine-grained soil−concrete interface for energy piles applications

2021

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Understanding the behaviour of soil-structure interfaces is critical for addressing the analysis and design of energy geostructures. In this study, the interface failure mechanism of energy piles (where a shear band is detached from the surrounding soil that behaves under oedometric conditions) is experimentally analysed in laboratory for saturated conditions. The choice of material (clayey soil and concrete), temperature range, and stress level is based on conditions that are likely to be encountered in practice. Specifically, cyclic thermal tests under constant vertical effective stress in oedometric conditions as well as constant normal stiffness (CNS) interface direct shear tests (in which samples have been subjected to thermal cycles between 10 and 40 °C) are presented. From a practical perspective, the results show very low volumetric strain variations and negligible effects on shear strength. The volumetric aspects do not appear to have significant impact on the shear resistance of the interfaces against cyclic thermal loads. Fundamental insight on the effects of thermal cycles on the concrete-soil interface behaviour which are relevant to energy piles are presented. In addition, the proposed interpretation procedure provides a basis for the standardisation of thermomechanical testing in geotechnical engineering.

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Section: Thermovolumetric Behaviour Of Fine-grained Soilsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cyclic thermomechanical response of fine-grained soil−concrete interface for energy piles applications

2021

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“…The properties of water-flowing in the pores and adsorbed on the particle surface-are temperature-dependent, thereby affecting the way the soil responds to external loads. As water, air and soil particles have different thermal properties, changes of temperature can also alter pressures and stresses within the soil [175]. Loss of apparent cohesion can occur in unsaturated soils as temperature increases-driven by a loss of water retention capacity-and structural collapse has also been reported [176,177].…”

Section: Irt Capabilities In Landslide Hazardsmentioning

confidence: 99%

Thermal Remote Sensing from UAVs: A Review on Methods in Coastal Cliffs Prone to Landslides

et al. 2020

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Coastal retreat is a non-recoverable phenomenon that—together with a relevant proneness to landslides—has economic, social and environmental impacts. Quantitative data on geological and geomorphologic features of such areas can help to predict and quantify the phenomena and to propose mitigation measures to reduce their impact. Coastal areas are often inaccessible for sampling and in situ surveys, in particular where steeply sloping cliffs are present. Uses and capability of infrared thermography (IRT) were reviewed, highlighting its suitability in geological and landslides hazard applications. Thanks to the high resolution of the cameras on the market, unmanned aerial vehicle-based IRT allows to acquire large amounts of data from inaccessible steep cliffs. Coupled structure-from-motion photogrammetry and coregistration of data can improve accuracy of IRT data. According to the strengths recognized in the reviewed literature, a three-step methodological approach to produce IRTs was proposed.

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“…For instance, during undrained heating, there may be an increase in pore-water pressure that leads to a decrease in effective stress and softening, which could result in decreases in shear modulus. For drained conditions, heating may cause a drying effect leading to suction hardening, which could result in increase in shear modulus (e.g., McCartney et al 2019). The majority of existing thermo-mechanical or thermo-hydro-mechanical constitutive models for unsaturated soils assume the elastic moduli (including the shear modulus) to be independent of temperature to simplify formulations (e.g., Thomas and He, 1997;Loret and Khalili, 2002;Laloui et al, 2003;Bolzon and Schrefler, 2005;Nuth and Laloui, 2008;Zhou and Ng, 2016).…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Model for Small-Strain Shear Modulus of Unsaturated Soils

Vahedifard

Thota

Cao

et al. 2020

J. Geotech. Geoenviron. Eng.

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Near-surface soils in geotechnical and geoenvironmental applications are often unsaturated, and natural or imposed changes in temperature may lead to a softening effect at constant suction that causes a change in stiffness. To capture thermal effects on the stiffness of unsaturated soils, this paper presents an effective stress-based, temperature-dependent model for the small-strain shear modulus of unsaturated soils, with an emphasis on silts. Temperature dependency of the model is accounted for by employing temperature-dependent functions for matric suction and effective saturation characterized using the soil-water retention curve. To validate the proposed model, laboratory tests using a modified triaxial apparatus with bender elements are carried out on Bonny silt to measure the small-strain shear modulus at 23 and 43°C for varying matric suctions of 0 to 110 kPa. The results from the proposed model are in a reasonable agreement with the experimentally measured values, and demonstrate the importance of considering temperature effects on the shear modulus of unsaturated soils. The accuracy of the model is further validated by comparing the predicted values with laboratory test results on silts reported by two independent studies reported in the literature.

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Emerging Thermal Issues in Geotechnical Engineering

Cited by 18 publications

References 230 publications

Cyclic thermomechanical response of fine-grained soil−concrete interface for energy piles applications

Cyclic thermomechanical response of fine-grained soil−concrete interface for energy piles applications

Thermal Remote Sensing from UAVs: A Review on Methods in Coastal Cliffs Prone to Landslides

Temperature-Dependent Model for Small-Strain Shear Modulus of Unsaturated Soils

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