Predicting Creep Settlements For Foundations in Permafrost

Ladanyi, B.; Lunne, Tom; Vergobbi, P

doi:10.4095/132483

Cited by 2 publications

(2 citation statements)

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“…The presented approach can be extended to other changing climate and resource related research such as the characterization of deforming sediment‐ice mixtures [ Ladanyi , ] and clathrate hydrates central to safe and efficient exploitation of natural hydrates and safety of CO 2 burial [ Ning et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Dynamics of ice mass deformation: Linking processes to rheology, texture, and microstructure

Piazolo

Wilson

Luzin

et al. 2013

Geochem Geophys Geosyst

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[1] Prediction of glacier and polar ice sheet dynamics is a major challenge, especially in view of changing climate. The flow behavior of an ice mass is fundamentally linked to processes at the grain and subgrain scale. However, our understanding of ice rheology and microstructure evolution based on conventional deformation experiments, where samples are analyzed before and after deformation, remains incomplete. To close this gap, we combine deformation experiments with in situ neutron diffraction textural and grain analysis that allows continuous monitoring of the evolution of rheology, texture, and microstructure. We prepared ice samples from deuterium water, as hydrogen in water ice has a high incoherent neutron scattering rendering it unsuitable for neutron diffraction analysis. We report experimental results from deformation of initially randomly oriented polycrystalline ice at three different constant strain rates. Results show a dynamic system where steady-state rheology is not necessarily coupled to microstructural and textural stability. Textures change from a weak single central c axis maxima to a strong girdle distribution at 35 to the compression axis attributed to dominance of basal slip followed by basal combined with pyramidal slip. Dislocation-related hardening accompanies this switch and is followed by weakening due to new grain nucleation and grain boundary migration. With decreasing strain rate, grain boundary migration becomes increasingly dominant and texture more pronounced. Our observations highlight the link between the dynamics of processes competition and rheological and textural behavior. This link needs to be taken into account to improve ice mass deformation modeling critical for climate change predictions.

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Section: Discussionmentioning

confidence: 99%

Dynamics of ice mass deformation: Linking processes to rheology, texture, and microstructure

Piazolo

Wilson

Luzin

et al. 2013

Geochem Geophys Geosyst

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“…Construction activity may lead to warming of the permafrost and to the damage and failure of foundation soils and structures. There is also increased concern related to the effect of possible climate change on infrastructure in the Arctic (Instanes 2003;Khrustalev 2000Khrustalev , 2001Ladanyi 1995Ladanyi , 1996Ladanyi et al 1996;Ladanyi et al 1997;Lunardini 2001;Nixon 1990aNixon , 1990b. For structures on permafrost it is often diffi cult to differentiate between the effect of possible climate warming and other factors that may affect a structure on permafrost, such as (Instanes 2003):…”

Section: Failure and Damage To Infrastructurementioning

confidence: 99%

Permafrost in Svalbard: a review of research history, climatic background and engineering challenges

Humlum¹,

Инстанес²,

Sollid³

2003

Polar Research

148

137

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This paper reviews permafrost in High Arctic Svalbard, including past and current research, climatic background, how permafrost is affected by climatic change, typical permafrost landforms and how changes in Svalbard permafrost may impact natural and human systems. Information on active layer dynamics, permafrost and ground ice characteristics and selected periglacial features is summarized from the recent literature and from unpublished data by the authors. Permafrost thickness ranges from less than 100 m near the coasts to more than 500 m in the highlands. Ground ice is present as rock glaciers, as ice‐cored moraines, buried glacial ice, and in pingos and ice wedges in major valleys. Engineering problems of thaw‐settlement and frost‐heave are described, and the implications for road design and construction in Svalbard permafrost areas are discussed.

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Predicting Creep Settlements For Foundations in Permafrost

Cited by 2 publications

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Dynamics of ice mass deformation: Linking processes to rheology, texture, and microstructure

Dynamics of ice mass deformation: Linking processes to rheology, texture, and microstructure

Permafrost in Svalbard: a review of research history, climatic background and engineering challenges

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