A Freezing-Thawing Damage Characterization Method for Highway Subgrade in Seasonally Frozen Regions Based on Thermal-Hydraulic-Mechanical Coupling Model

Deng, Qibo; Liu, Xiao; Zeng, Chao; He, Xianzhi; Chen, Fengguang; Zhang, Siyu

doi:10.3390/s21186251

Cited by 26 publications

(7 citation statements)

References 63 publications

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“…The volumetric ice content in Eq. ( 6) is evaluated by empirical equations (Deng et al, 2021;Tang et al, 2021)…”

Section: Governing Equationsmentioning

confidence: 99%

Holistic multiphysics simulation of the climatic responses of cold region pavements

Jiang,

2023

Preprint

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In cold regions, the environment dynamics lead to variations of soil temperature, water content, and deformation, which are characterized by highly coupled physical interplay. The hydraulic and thermal properties of unsaturated soils are highly nonlinear, which is further complicated when subjected to freezing. This paper presents a comprehensive multiphysics coupling model to evaluate these complex processes. The model considers the behaviors of unsaturated frozen soils. It accounts for the influences of meteorological, geothermal, and hydrological factors. The model is validated through two pavement case studies using Long-Term Pavement Performance (LTPP) road section data. The first case analysis is performed for a pavement section in Vermont, and the simulation lasted for 30 days during a non-freezing season on an hourly basis. The results validated the performance of the model considering unsaturated soil behaviors. The second case study is based on a daily analysis of a pavement section in South Dakota over a freezing-thawing cycle over 194 days. The results validated the model in considering the frozen unsaturated soil behaviors. Both case studies demonstrate the performance of this comprehensive model in quantifying the spatial and temporal variations of soil temperature and water content in response to environmental stressors. The capability of the model in accurately predicting the responses of pavement to the meteorological factors unleashes the potential of this model to assess the effects of climate and climate change on cold region pavement, as well as other types of geostructures.

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“…The volumetric ice content in Eq. ( 6) is evaluated by empirical equations (Deng et al, 2021;Tang et al, 2021)…”

Section: Governing Equationsmentioning

confidence: 99%

Holistic multiphysics simulation of the climatic responses of cold region pavements

Jiang,

2023

Preprint

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“…Further, the permeability coefficient is a key factor affecting water migration, and thus it is an important influencing factor in the study of the frost damage mechanism of infrastructure in cold regions, whether in normal frozen soil or saline frozen soil. Besides, the permeability coefficient is also a crucial component in numerous numerical models of frozen soil, including the hydrothermal coupled model (Taylor and Luthin, 1978;Zhang et al, 2021a), the hydrothermal salt coupled model (Zhang et al, 2021b;Liu et al, 2021), the hydrothermal force coupled model (Deng et al, 2021), and the hydrothermal salt force coupled model (Xu, 2021).…”

Section: Introductionmentioning

confidence: 99%

Study on the permeability coefficient model of salinized frozen soil based on unfrozen water content curve

Liu

Cheng²,

Ge³

et al. 2023

Front. Earth Sci.

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Due to the fact that the permeability coefficient of salinized frozen soil is difficult to measure through experimental test, this paper develops a model of the permeability coefficient of salinized frozen soil by using SFCC curves, which takes into account the effects of velocity slip on pore wall and seepage of unfrozen water film. This model is on the basis of capillary bundle model, and combines with phase diagram theory of water-salt binary system. For the silty clay from Qinghai-Tibet Plateau and silts from Onedia, the permeability coefficient fluctuation vs. temperature is calculated using the model. The estimated calculations of the permeability coefficient model were all found to be in good agreement with the experimental data by comparison. Additionally, the variation trend of permeability coefficient of NaCl, Na2SO4, and Na2CO3 type saline soils containing different salt contents is examined. The results indicate that before saline soils freeze, NaCl does not crystallize and thus has little impact on the permeability coefficient, whereas Na2SO4 and Na2CO3 both crystallize and block the pores, the permeability coefficient decreases with decreasing temperature. Once the saline soils have frozen, the freezing temperature has a larger impact on the permeability coefficient. During the early stage of freezing, the lower the freezing temperature is, the larger the permeability coefficient is. In the late stage of freezing, the permeability coefficients with various salt contents tended to be the same.

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“…However, there are few studies on highway subgrade in cold regions, especially on the mechanics and deformation mechanism of thawed soil after freeze-thaw cycles. At present, the research on d mainly focuses on the thermal insulation performance of highway subgrade ( 22,23 ), moisture change ( 24,25 ), vehicle load ( 26,27 ), modi ed treatment ( 28-30 ), multield coupling ( 31,32 ) and other elds. Therefore, in this paper, the mechanical properties of subgrade soil in cold regions after thawing under different conditions were measured by indoor mechanical tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on mechanical properties of subgrade soil in cold region under different conditions

Wang,

Li,

Jia

et al. 2023

Preprint

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In order to study the change of mechanical properties of subgrade under the condition of thawing after the highway in cold region is subjected to freeze-thaw action all the year round. In this paper, the effects of freeze-thaw cycles, freezing temperature, water content and confining pressure on the mechanical properties of subgrade soil in cold regions after thawing were studied by carrying out indoor mechanical tests, and the mechanical properties of subgrade soil in cold regions after thawing under different conditions were measured. The test results show that : 1 ) after 7 freeze-thaw cycles, the failure stress of subgrade soil decreases from 321.7 kPa to 289.9 kPa, with a decrease of 9.9%, and the elastic modulus decreases by 19.9%. 2 ) When the freezing temperature is reduced from − 5°C to − 15°C, the failure stress of subgrade soil is reduced from 303.9 kPa to 290.1 kPa, which is reduced by 13.8 kPa. The reduction range is about 4.5%, and the elastic modulus is about 1.6%;3 ) When the water content increased from 6–12%, the failure stress decreased from 405.43 kPa to 288.4 kPa, with a decrease of 29.1%, and the elastic modulus decreased approximately linearly, with a decrease of 50.4%. 4 ) When the confining pressure increases from 50 kPa to 150 kPa, the failure stress increases from 194.7 kPa to 367.7 kPa, and the failure stress increases by 88.8%. The elastic modulus increases by 154.1% with the increase of confining pressure. The research results can provide reference for highway and engineering construction in the western silty sand distribution area.

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A Freezing-Thawing Damage Characterization Method for Highway Subgrade in Seasonally Frozen Regions Based on Thermal-Hydraulic-Mechanical Coupling Model

Cited by 26 publications

References 63 publications

Holistic multiphysics simulation of the climatic responses of cold region pavements

Holistic multiphysics simulation of the climatic responses of cold region pavements

Study on the permeability coefficient model of salinized frozen soil based on unfrozen water content curve

Experimental study on mechanical properties of subgrade soil in cold region under different conditions

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