The influence of thawing and consolidation conditions on the deformation properties of thawing soils

Kotov, P. I.; Roman, L. T.; Tsarapov, M. N.

doi:10.3103/s014587521702003x

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…Kotov et al [20] studied the effects of thawing conditions (plane-parallel or three dimensions) on the deformation characteristics (thawing and compression coefficients) of thawing soils (sand, sandy loam, and clay loam) with preset physical properties of massive and layered cryogenic textures. The lateral surface and the bottom end of the instrument used for plane-parallel thawing were insulated with thermally non-conductive Caprolon material.…”

Section: Test Methods and Apparatus For Thawing Settlementmentioning

confidence: 99%

A novel theoretical model to predict thawing settlement of clayey permafrost

Qu,

Tang,

Zhao

et al. 2024

Preprint

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As infrastructure construction increases in cold climates, the thermal deformation of frozen soil needs to be taken seriously. In contrast to frost heave, thawing settlement is another type of thermal deformation less attention received in recent years but has yet caused significant harm to early infrastructure like roadways, railways, and pipelines in cold climates. Engineers attempted to foresee the thawing settlement of frozen soil before design, but there was no universally accepted and satisfactory theoretical model for the prediction. Based on the four-phase charting of frozen soil and taking into account the change of frozen soil systems experiencing thawing settlement, an original theoretical model is developed. The derivation offers seven postulates, induces three new factors that describe the thermal-hydraulic- structural characteristics of soil, and attempts to take specimen scale into account. The innovative model adopts initial water content and dry density to forecast the thawing settlement coefficient. Thawing settlement data of clayey permafrost from various regions of Northeast China were substituted for verification. The model demonstrates that in addition to the initial water content and dry density, the unfrozen water content, water holding capacity, and skeletal structure maintenance properties of frozen soil also affect the thawing settlement of frozen clayey permafrost but with different weights. The model also explains some essence of thawing settlement distribution problems. Finally, a happening probability list of various thawing settlement coefficients is provided based on the probability of various combinations of water-holding capacity and skeleton structure.

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Section: Test Methods and Apparatus For Thawing Settlementmentioning

confidence: 99%

A novel theoretical model to predict thawing settlement of clayey permafrost

Qu,

Tang,

Zhao

et al. 2024

Preprint

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“…Thaw settlement calculations are performed using deformation characteristics (thawing and compressibility coefficients). These characteristics can be determined by field (hot stamp) and laboratory tests (compression and triaxial test) (Kotov et al 2017;Kal'bergenov 2019). Deformation characteristics for different test methods can differ by several times in magnitude (Kotov et al 2015).…”

Section: Climate Change In the Vorkuta Regionmentioning

confidence: 99%

Building Stability On Permafrost In Vorkuta, Russia

Kotov

Khilimonyuk

2021

GES

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The Infrastructure stability on permafrost is currently an important topic as the Arctic countries are developing climate change adaptation and mitigation programs. Assessing the sustainability of infrastructure facilities (especially in urban environments) is a difficult task as it depends on many parameters. This article discusses the city of Vorkuta, which is located in the northwest of Russia. This city differs from many others built on permafrost because most of buildings were built according to Principle II (The Active Method) of construction on permafrost with thawing soil prior to construction. Assessments of the engineering and geocryological conditions, basic principles of construction in the city, and reasons for building failures, were carried out within this study. The research is based on publications, open data about buildings, and visual observations in Vorkuta. About 800 buildings are in use in Vorkuta in 2020 (43% of what it was 50 years ago). According to the analysis, about 800 houses have been demolished or disconnected from utility lines over the past 50 years (about 250 of these are still standing, pending demolition). Since 1994, the construction of new residential buildings has almost stopped. Therefore, buildings that have been in use for over 50 years will account for 90% of the total residential housing stock by 2040. The effects of climate change in the city will depend primarily on the principle of construction employed and on the geocryological conditions of the district. Buildings constructed according to Principle I (The Passive Method) were found to be more vulnerable due to a decrease in permafrost bearing capacity. The impact of increasing air temperature on some of the buildings built on bedrock (the central part of the city) and some built on thawing soil will be minimal, as other factors are more significant.

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