Large-Strain Nonlinear Thaw Consolidation Analysis of the Inuvik Warm-Oil Experimental Pipeline Buried in Permafrost

Dumais, Simon; Konrad, Jean‐Marie

doi:10.1061/(asce)cr.1943-5495.0000179

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…As the soil temperature rises, the un-frozen water in the ice matrix can exhibit compression and increasing creep rate properties. When the soil temperature surpasses the freezing point, the bearing capacity is greatly reduced due to increases in excess water and volume displacement, and the soil can no longer satisfy the engineering stability, leading to differential settlement and infrastructure failure 36 . Spatial distribution and thickness (up to 1500 m in Russia, 500 m in Canada and 700 m in Alaska) of permafrost varies substantially 11,13,32 .…”

Section: Building On Permafrostmentioning

confidence: 99%

Impacts of permafrost degradation on infrastructure

Hjort

Streletskiy

Doré

et al. 2022

Nat Rev Earth Environ

262

102

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Degradation of permafrost damages infrastructure and can jeopardize the sustainable development of polar and high-altitude regions. Warming and thawing of ice-rich permafrost is related to several natural hazards, which can pose a serious threat to the integrity of constructions and the economy. In this Review, we explore the extent and costs of observed and predicted infrastructure damages, and methods to mitigate adverse consequences of permafrost degradation. We also present the diversity of permafrost hazards and problems associated with construction and development in permafrost areas.Finally, we highlight seven topics to support sustainable infrastructure in the future. The observed damages are substantial and cumulative problems of infrastructure can be exacerbated owing to the increasing human activity in permafrost areas and climate change.It has been estimated that from one-third to more than half of critical circumpolar infrastructure could be at risk by mid-century. Permafrost degradation-related infrastructure costs could rise to tens of billion US dollars by the second half of the century.To successfully manage with climate change effects in permafrost areas a better understanding is needed about which constructions are likely to be affected by permafrost degradation. Especially, mitigation measures are needed to secure existing infrastructure and future development projects. Key points• Operational infrastructure is critical for sustainable development of Arctic and highaltitude communities, but the integrity of constructions is jeopardized by degrading permafrost.• The extent of observed damages is substantial (up to tens of percentages of infrastructure elements) and is likely to increase with climate warming.• From one-third to more than 50% of fundamental circumpolar infrastructure is at risk by mid-century.• Engineering solutions to mitigate the effects of degrading permafrost exist but their economic cost is high at regional scales.• There is a need to quantify the economic impacts of climate change on infrastructure and occurrence of permafrost-related infrastructure failure across the permafrost areas.• Future development projects should conduct local-scale infrastructure risk assessments and apply mitigation measures to avoid detrimental effects on constructions, socioeconomic activities, and ecosystems in permafrost areas under rapidly changing climatic conditions.

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Section: Building On Permafrostmentioning

confidence: 99%

Impacts of permafrost degradation on infrastructure

Hjort

Streletskiy

Doré

et al. 2022

Nat Rev Earth Environ

262

102

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“…The EIC was determined for each sample following the procedure outlined in Kokelj and Burn (2003) (Equation 1). From a geotechnical perspective, these values are likely conservative estimates of the expected thaw subsidence as actual consolidation with overburden pressure would likely result in more subsidence (Dumais & Konrad, 2019). The resulting EIC for each cryostratigraphic interval (defined by an upper and lower depth from the ground surface) in the laboratory data (n = 354) was cross-referenced with the intervals for which geotechnical variables were recorded.…”

Section: Available Datamentioning

confidence: 99%

Vertical distribution of excess ice in icy sediments and its statistical estimation from geotechnical data (Tuktoyaktuk Coastlands and Anderson Plain, Northwest Territories)

et al. 2023

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Excess ice, found as massive ice and within icy sediments, is an important variable to quantify as it is a dominant control on the terrain and geotechnical response to permafrost thaw. A large amount of permafrost borehole data are available from the Tuktoyaktuk Coastlands, however, field geotechnical assessments typically only involve the estimation of visible ice. To add significant value to these datasets, a cryostratigraphic dataset collected along the Inuvik-Tuktoyaktuk Highway (566 boreholes) is used to develop a beta regression model which predicts the excess ice content of icy sediments based on interval depth, visible ice content, material type, and Quaternary deposits. The resulting predictions are compared to recorded massive ice intervals and show that ground ice within icy sediments can contribute up to 65% of the excess ice and potential thaw strain within the first 10 meters from the surface in this area. This study shows the general applicability of this approach and indicates that comparable, quantitative data on ground ice conditions should be collected with drilling programs to derive geotechnical variables and reduce modeling uncertainties so that ground ice data are available for quantitative analysis.

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“…e stress-strain relationship of ice-rich frozen soil shows a strong nonlinearity when it is postthaw. Obviously, the linear elastic stress-strain relationship cannot reasonably describe the nonlinear mechanical behavior [11][12][13]. Correspondingly, the calculation accuracy is greatly reduced by using elastic theory.…”

Section: Introductionmentioning

confidence: 99%

“…Based on this theory, Dumais and Konrad [13] studied the law of thaw consolidation of the Inuvik experimental warmoil pipeline built on ice-rich permafrost foundations. In the abovementioned one-dimensional theories, the void ratio is used as an independent variable, which leads to large calculation errors when describing practical problems with complex boundaries.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Analysis of the Thaw Settlement in Ice-Rich Embankments

Yang

Peipei

Cai

2021

Mathematical Problems in Engineering

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In this paper, the law of ice-rich permafrost embankment thaw consolidation is studied based on three-dimensional nonlinear large strain thaw consolidation theory. To avoid problems associated with numerical simulation efficiency and stability when a nonlinear stress-strain relationship is employed, a segment interpolation function is used to implement the nonlinear relationship between the compression modulus and the void ratio, and the corresponding simulation strategy is proposed. Through a comparison of the monitoring and calculated results, it is indicated that the calculation accuracy on ice-rich embankment thaw settlement can be notably improved after nonlinear theory is implemented with the proposed numerical simulation method. A further analysis of the calculated results indicates that the interactive effects between the thermal and mechanical fields can be more reasonably described by nonlinear theory than by linear theory. It is also determined that the postthaw pore water in the shallow embankment dissipates in the early operation period, while in the following long operation period, the development of the permafrost embankment thaw settlement is mainly due to the dissipation of newly postthaw pore water at the thaw depth or the permafrost table. This is one of the main differences in the law of permafrost embankment thaw settlement compared with that of unfrozen embankments.

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Large-Strain Nonlinear Thaw Consolidation Analysis of the Inuvik Warm-Oil Experimental Pipeline Buried in Permafrost

Cited by 17 publications

References 13 publications

Impacts of permafrost degradation on infrastructure

Impacts of permafrost degradation on infrastructure

Vertical distribution of excess ice in icy sediments and its statistical estimation from geotechnical data (Tuktoyaktuk Coastlands and Anderson Plain, Northwest Territories)

Nonlinear Analysis of the Thaw Settlement in Ice-Rich Embankments

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