Novel anti-frost subgrade bed structures a high speed railways in deep seasonally frozen ground regions: Experimental and numerical studies

Tai, Bowen; Yue, Zurun; Sun, Tiecheng; Qi, Shouchen; Li, Lei; Yang, Zhihao

doi:10.1016/j.conbuildmat.2020.121266

Cited by 40 publications

(20 citation statements)

References 22 publications

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“…The main factor influencing water migration is the coupling of the temperature and water fields during soil freezing and thawing, i.e. the movement of water under the effect of temperature gradients [28]. The temperature distribution of the numerical simulation is shown in Figs.…”

Section: Temperature -Freeze Depth -Water Content Regimementioning

confidence: 99%

“…In seasonal freeze regions, the water in soil freezes under the clod temperature [29]. The temperature changes dramatically from the ground surface to the maximum freeze depth-a process that directly affects the direction and intensity of water migration [28]. In this paper, the trend of soil freeze depth is summarized in Fig.…”

Section: Characteristics Of Temperature and Freeze Depth Change In Seasonal Freeze Regionsmentioning

confidence: 99%

“…The temperature at the surface in seasonal freeze regions varies widely depending on the seasons, resulting in differences in temperature from the surface to the maximum freeze depth [28,30]. For example, at different locations on the slopes, the freeze depth varies between shaded and sunny slopes [31,32].…”

Section: Characteristics Of Temperature and Water Variation In Seasonal Freeze Regionsmentioning

confidence: 99%

See 2 more Smart Citations

Study on the Hydrothermal Coupling Characteristics of Polyurethane Insulation Boards Slope Protection Structure Incorporating Phase Change Effect

Liu

Wang

et al. 2021

Preprint

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As an important hydraulic infrastructure, the canals are essential for agricultural irrigation, shipping and industry. In the seasonal freeze regions, the water conveyance canals are damaged due to the effects of freeze-thaw cycles. The freeze depth of soil in the water transfer canal varies considerably due to changes in temperature and water content. The paper compares the relationship of the freeze depth, temperature and water content by field tests and numerical calculation methods Incorporating phase change. The results show that the decrease in temperature causes the water in the soil to freeze, the ice front migrate downwards, and the water in soil below ice front gradually migrate towards the ice front, resulting a large difference in water content of the soil before and after freezing. An insulation slope structure, Polyurethane insulation board + Concrete board slope structure (PC), is proposed in this paper to mitigate the effect of freezing and thawing on the water conveyance canals. Under the protective effect, the freeze depth decreases significantly. In addition, this paper compares the anti-frost effect of different thicknesses polyurethane insulation boards, and the results can provide a reference for the anti-frost design of water conveyance canals.

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Section: Temperature -Freeze Depth -Water Content Regimementioning

confidence: 99%

Section: Characteristics Of Temperature and Freeze Depth Change In Seasonal Freeze Regionsmentioning

confidence: 99%

Section: Characteristics Of Temperature and Water Variation In Seasonal Freeze Regionsmentioning

confidence: 99%

See 1 more Smart Citation

Study on the Hydrothermal Coupling Characteristics of Polyurethane Insulation Boards Slope Protection Structure Incorporating Phase Change Effect

Liu

Wang

et al. 2021

Preprint

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“…Seasonally frozen ground is mainly distributed in highlatitude areas such as northeast China, north China, and northwest China, accounting for 53.5% of China's total land area [1,2]. Subgrade materials in cold regions undergo several freeze-thaw cycles every year, leading to subgrade degradation [3][4][5]. e frost heave problem of high-speed railway foundations in seasonally frozen regions has garnered significant attention and research interest from experts and scholars.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Moisture Content of Subgrade Materials in High‐Speed Railway Using a Deep Learning Method

Chen

Wang

et al. 2021

Advances in Materials Science and Engineering

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Moisture content of subgrade materials is an essential factor affecting frost heave deformation of high-speed railway subgrade in a seasonally frozen region. Modeling and predicting moisture transport play an important role in analyzing the subgrade thermal and hydraulic conditions in cold regions. In this study, a long short-term memory (LSTM) model was proposed based on subgrade material moisture in two sections during one winter and spring cycle from 2015 to 2016. The reliability of the model was verified by comparing the monitoring data with the model results. The results demonstrate that the LSTM model can be effectively used to forecast the dynamic characteristics of the moisture of subgrade materials. The data of simulated moisture content of subgrade materials have a root mean square error ranging from 0.17 to 0.47 in the training phase and from 0.20 to 10.5 in the testing phase. The proposed model provides a novel method for long-term moisture prediction in subgrade materials of high-speed railways in cold regions.

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“…In long-term operation, frozen soil highways often suffer from subsidence, cracking, and other diseases [15][16][17][18]. The existing studies mainly analyze the temperature field of each level of highway, failing to fully consider the water migration of the roadbed [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Temperature Field Distribution and Thermal Stability of Roadbed in Permafrost Regions

Yao¹,

Shi²,

Zu³

2021

IJHT

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Many highways and railways in western China are built on permafrost roadbed. Frost heave and thaw settlement might cause diseases to frozen soil roadbed, such as deformation and cracking. For long-term operation, frozen soil roadbed should be kept stable and durable. Therefore, this paper analyzes the distribution law of temperature field of roadbed in permafrost regions, under the effect of thermal stability. Based on the thermodynamic properties of permafrost, the authors analyzed the influence of engineering geological factors, roadbed structural factors, and natural environmental factors on the thermal stability of frozen soil roadbed. Next, the antifreeze mechanism of frozen soil roadbed was described, together with the calculation methods for the relevant parameters. Afterwards, the temperature field of the roadbed with low thermal conductivity insulation material was analyzed by two methods, namely, steady-state thermal analysis and transient thermal analysis, and the solving process of roadbed temperature field was explained in details. The proposed analysis method and solving algorithm were proved valid through experiments. The research results provide a reference for the reasonable design of frozen soil roadbed.

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Novel anti-frost subgrade bed structures a high speed railways in deep seasonally frozen ground regions: Experimental and numerical studies

Cited by 40 publications

References 22 publications

Study on the Hydrothermal Coupling Characteristics of Polyurethane Insulation Boards Slope Protection Structure Incorporating Phase Change Effect

Study on the Hydrothermal Coupling Characteristics of Polyurethane Insulation Boards Slope Protection Structure Incorporating Phase Change Effect

Modeling of Moisture Content of Subgrade Materials in High‐Speed Railway Using a Deep Learning Method

Temperature Field Distribution and Thermal Stability of Roadbed in Permafrost Regions

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