Numerical Modeling of Moisture Migration in High-Speed Railway Subgrade

Wang, Hanlin; Chen, Renpeng; Luo, Lan; Wu, Jie

doi:10.1061/9780784479278.033

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…where fPg is the synthetic array and the subscript f gt indicated the time [14]. According to Wang et al [13], λ = ð4:17w 2 + 1504Þ10 0:25ρ −3:9 d ; ρC p is the volumetric heat capacity and specific heat capacity [15] C = ρ d ð1:27 + 0:021wÞ 10 3 .…”

Section: Research On the Mathematical Model Of The Frozen Soilmentioning

confidence: 99%

A Review of the Research on Thermo-Hydro-Mechanical Coupling for the Frozen Soil

Teng

Liu

et al. 2022

Geofluids

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This paper reviews the history of the research development on the coupling mechanism of the multiphysical field, e.g., thermo-hydro-mechanical (THM), for frozen soil. The objective is to deepen the current understanding of the theories and mechanism of multiphysical field coupling in the frozen soil and the dynamic changes in the temperature, moisture, and stress fields during soil freezing. A new differential equation of the coupling of temperature field and moisture field is proposed. Based on the DiscreteFrechetDist algorithm, a fitting method of evaluating a curve is proposed. The paper is expected to help understand the soil freezing process in cold regions and enhance the innovativeness of the research methodologies dealing with multifield coupling for the frozen soil.

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Section: Research On the Mathematical Model Of The Frozen Soilmentioning

confidence: 99%

A Review of the Research on Thermo-Hydro-Mechanical Coupling for the Frozen Soil

Teng

Liu

et al. 2022

Geofluids

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“…Moisture Field. In winter, the moisture migration in shallow loess is unsteady under the freezing action with the finite element equation expressed as follows [32]:…”

Section: Finite Element Equation and Parameter Determination Ofmentioning

confidence: 99%

Study on Varying Characteristics of Temperature Field and Moisture Field of Shallow Loess in the Freeze‐Thaw Period

Zhang

Zhi

Liu

et al. 2020

Advances in Materials Science and Engineering

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The moisture and the temperature variation of shallow loess during the freeze-thaw process have tremendous influences on the freeze-thaw disease and agricultural development. The present paper, based on the field test of the temperature and water content of the shallow loess in the seasonal frozen region, probes into the variation of the temperature and moisture fields of shallow loess in the freeze-thaw period. Field test shows that the daily variation of surface temperature reaches the maximum with the peak temperature appearing around 14:00, and the time when the peak temperature appears gradually postpones as the depth increases. Moreover, the daily variation of soil temperature decreases with the increase of temperature, and the variation can be ignored given the depth of more than 30 cm. In addition, there is an obvious variation of moisture content in shallow soil under the action of freeze-thaw cycles. In this regard, the coupled calculation model is proposed in this paper to simulate the dynamic variation of temperature and moisture in shallow soil in Bin County located in Western China under natural conditions, compare the calculation value with the measurement value, and further verify the rationality of the numerical calculation method and parameter selection. Furthermore, the variation law of the maximum frozen depth with the air temperature is obtained through the simulation of extreme cold climate conditions.

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“…As it is difficult to apply the daily precipitation data directly into the numerical model, the duration of rainfall is transited from daily precipitation using the method proposed by Wang et al 27 An empirical formula dealing with the relationship between average rainfall intensity i and rainfall duration time t is used 28 i…”

Section: Analyses Of Rainfall Conditionsmentioning

confidence: 99%

Effects of degree of compaction and fines content of the subgrade bottom layer on moisture migration in the substructure of high-speed railways

Chen

Wang

Hong

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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Moisture migration and distribution in the substructure are found to be the important reasons for water-related problems in high-speed railways. In this study, a numerical model of a double-line ballastless track-bed consisting of a substructure (subgrade surface layer, subgrade bottom layer and subsoil) and a superstructure (including two concrete bases right above the substructure) was established. The superstructure was considered as an impermeable boundary in this model, while two fissures were set at the joint edges of the left-line concrete base and the surface layer, simulating the infiltration area of rainwater. The effects of degree of compaction and fines content of the bottom layer due to moisture migration in the high-speed railway substructure were investigated on this model by applying and analyzing the 2013 rainfall data of Hangzhou, China, for a three-year period. The results show that the saturation zones develop in the subgrade, after a three-year period, with the size increasing with the increase in the degree of compaction or fines content due to higher water retention capacity and lower permeability of the soil. Furthermore, the variations of volumetric water content at different depths of the left-fissure profile indicate that as the degree of compaction or fines content increases, the arriving time of the wetting front increases, but the fluctuation amplitude of the volumetric water content after the arrival of the wetting front decreases on the whole. The degree of compaction appears to present a more significant impact on these two parameters. In particular, a threshold value of the degree of compaction between 0.90 and 0.93 is observed, prolonging the arriving time of the wetting front remarkably at a certain elevation. Besides, it takes a longer time for the wetting front to pass through the interface between the surface layer and the bottom layer for each case. From a practical point of view, it will be beneficial to employ drainage methods to drain out the water before it reaches the bottom layer.

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Numerical Modeling of Moisture Migration in High-Speed Railway Subgrade

Cited by 6 publications

References 8 publications

A Review of the Research on Thermo-Hydro-Mechanical Coupling for the Frozen Soil

A Review of the Research on Thermo-Hydro-Mechanical Coupling for the Frozen Soil

Study on Varying Characteristics of Temperature Field and Moisture Field of Shallow Loess in the Freeze‐Thaw Period

Effects of degree of compaction and fines content of the subgrade bottom layer on moisture migration in the substructure of high-speed railways

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