Effect of temperature gradients on water migration, frost heave and thaw-settlement of a clay during freezing-thaw process

Derk, Ludmilla; Unold, Florian

doi:10.1080/08916152.2022.2062069

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…The freeze–thaw cycle occurs mainly in seasonal regions; the formation of ice causes volume expansion. In a finite volume, ice crystals expand during formation [ 5 ]. During freezing, the development of ice crystals squeezes the soil particles, expanding the pores between the soil particles.…”

Section: Introductionmentioning

confidence: 99%

Solidification/Stabilization of Chromium-Contaminated Soils by Polyurethane during Freeze–Thaw Cycles: Mechanical, Leaching and Microstructure Characterization

Ma,

Zheng,

Chen

et al. 2024

Materials

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The treatment of chromium-contaminated soil in seasonal frozen soil areas has been the subject of recent interest. Polyurethane (PU), as a polymer material with excellent freeze–thaw resistance and abrasion resistance, has the potential to solidify Chromium-Contaminated soil in seasonal frozen soil areas. However, there is a lack of research on the mechanism of PU involved in solidifying/stabilizing chromium-contaminated soil in seasonal frozen regions from the perspective of pore structure and functional group coordination bonds. In this study, the leaching behavior of PU with different contents under different freeze–thaw cycles was analyzed, and the mechanism of PU in seasonal frozen regions was explored from the perspective of pores and functional groups by combining various microscopic characterization methods. The results show that PU can effectively resist the deterioration of chromium-contaminated soil after freeze–thaw cycles and can better prevent the harm of secondary leaching. The leaching concentration of chromium ion is only 1.09 mg/L, which is below China’s regulatory limits. PU is beneficial for inhibiting the expansion of ice crystals in chromium-contaminated soil in seasonal frozen soil areas. PU solidifies chromium by physical encapsulation and complexation reactions. The amide functional groups, methyl-CH3 and isocyanate groups in PU play a leading role in the complexation with chromium. Although the freeze–thaw cycle will destroy the coordination bond between the PU functional group and chromium, chromium cannot break through the bond of PU film. This study confirmed the feasibility of using PU to solidify Chromium-Contaminated soil in seasonal frozen soil areas, which can provide research support and reference for in situ engineering in the future.

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Section: Introductionmentioning

confidence: 99%

Solidification/Stabilization of Chromium-Contaminated Soils by Polyurethane during Freeze–Thaw Cycles: Mechanical, Leaching and Microstructure Characterization

Ma,

Zheng,

Chen

et al. 2024

Materials

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show abstract

“…In seasonally frozen soil areas, changes in the subgrade's seasonal temperature can cause frost heaving and thaw settlement (Lu et al, 2018;Derk and Unold, 2022;Liu et al, 2022). Soil strength in cold regions is critical for the service life and structural safety of the high-speed railway and energy infrastructure projects and residential construction (Teng et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Deviatoric stress-strain curve construction with strain-softening account via the damage-modified Duncan-Chang, arctangent and informer models: a comparative analysis

Teng,

Zhou,

Teng

et al. 2023

Front. Earth Sci.

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Engineering construction in cold regions cannot be separated from permafrost research. This study aimed to determine the mechanical properties and changing laws of artificially frozen clay through triaxial tests. Two models have been established: a physical model based on the tradi-tional phenomenological constitutive theory and a deep learning model based on the data-driven constitutive theory, taking into account the softening phenomenon. The accuracy and applica-bility of the models were verified, followed by a comparative analysis. The results of the analysis are as follows. The Duncan-Chang model can describe the characteristics of the hardening-type deviatoric stress-strain curve, but it cannot describe the characteristics of the softening-type de-viatoric stress-strain curve. The Modified Duncan-Chang (MDC) model fails to accurately de-scribe the characteristics of a smooth deviatoric stress-strain curve. The Strain-Damage Modified Duncan-Chang (SD-MDC) model exhibits a good fit in both the ascending and descending seg-ments of the curve, but it lacks effectiveness in the convergence segment of the S-shaped sof-tening curve. For this reason, this paper has chosen the arctangent function to establish a Strain-Damage Modified arctangent constitutive model (SD-MAM). This model accurately re-flects the stress evolution process of different types of frozen soils. Additionally, the Informer time series prediction algorithm was utilized to develop the Informer permafrost deviatoric stress prediction model which achieved an R2 value above 99%. In comparison to the SD-MAM model, the Informer model demonstrates higher precision, does not rely on assumptions, is cost-effective, and has a wide range of applications. However, it lacks physical meaning, and interpretability, and requires further discussion regarding the reliability of the results. This study offers valuable insights into the development and application of constitutive models for frozen soils.

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Predicting frost heave in soil-water systems using the generalized regression neural network optimized with particle swarm optimization algorithm

Cai,

Wang,

et al. 2024

Cold Regions Science and Technology

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Effect of temperature gradients on water migration, frost heave and thaw-settlement of a clay during freezing-thaw process

Cited by 8 publications

References 19 publications

Solidification/Stabilization of Chromium-Contaminated Soils by Polyurethane during Freeze–Thaw Cycles: Mechanical, Leaching and Microstructure Characterization

Solidification/Stabilization of Chromium-Contaminated Soils by Polyurethane during Freeze–Thaw Cycles: Mechanical, Leaching and Microstructure Characterization

Deviatoric stress-strain curve construction with strain-softening account via the damage-modified Duncan-Chang, arctangent and informer models: a comparative analysis

Predicting frost heave in soil-water systems using the generalized regression neural network optimized with particle swarm optimization algorithm

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