Coupled simulation of wave propagation and water flow in soil induced by high‐speed trains

Kettil, Per; Lenhof, Bernd; Runesson, Kenneth; Wiberg, Nils‐Erik

doi:10.1002/nag.670

Cited by 11 publications

(2 citation statements)

References 10 publications

(13 reference statements)

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“…China's railways are gradually moving towards high-speed, heavy-duty development [1]. The subgrade bears and transmits track gravity and the dynamic action of traffic; hence the stability of the internal soil and rock foundation of railway subgrades have great significance for the safety of railway operation [2][3][4][5][6][7]. Meanwhile, due to the infiltration of atmospheric precipitation and the difficulty of drainage for fine soils, the water content in the subgrade increases.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Water and Soil Migration and Mud Pumping of Subgrades under Traffic Load

Wang

Zhang²,

Wang³

et al. 2023

Atmosphere

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Atmospheric precipitation leads to the increase of moisture in the subgrade. The moisture and soil migration in subgrade is a key scientific problem in evaluating the service performance of the subgrade and resolving or preventing mud pumping. Using a self-developed testing system as well as a numerical simulation model, a detailed study of the dynamic hydraulic characteristics, water migration mechanism, fine soil migration mechanism, and mud pumping properties of the subgrade was conducted. The results showed that water migrated into the upper layer of the subgrade under traffic load. Meanwhile, a pressure gradient for the pore water was generated in the subgrade. This kind of pressure gradient is beneficial for the moisture and fine soil migration. With rising groundwater level and increasing traffic load, the porosity of the subgrade soil differs at different depths. The fine soil migration is caused by water migration, which causes new migration channel for water in the subgrade. Then, a circulating system of moisture and fine soil is formed in the subgrade under a traffic load. After that, the upper layer subgrade soil is nearly saturated under the action of traffic load. Then, the nearly saturated soil liquefies instantaneously, becoming mud, under the action of traffic load. However, as the loading time progresses, the moisture and fine soil in the subgrade continue to migrate upward, resulting in the mud being pumped into the ballast and the gradual disappearance of liquefied soils at different depths.

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Section: Introductionmentioning

confidence: 99%

Investigation of Water and Soil Migration and Mud Pumping of Subgrades under Traffic Load

Wang

Zhang²,

Wang³

et al. 2023

Atmosphere

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show abstract

“…The water transport is important since it strongly affects the mechanical behavior of subgrade for low permeability saturated soils when subjected to moving traffic loading, and the water flow can lead to internal erosion and particle migration such as mud pumping ( Fig. 1) [2]. That is, the pore-water pressure field will be developed as well as the moving water will be produced when the saturated subgrade is subjected to the traffic loads.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response of water saturated subgrade surface layer under high speed train using moving element method

Bao¹,

Su²,

Liu³

et al. 2017

J. vibroeng.

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Since the moving element method (MEM) is an elegant method for solving problems involving moving loads. This paper extends the moving element method to the dynamic response of the water-saturated subgrade surface layer under a high-speed train. The track model is described as the Euler beam to simulate the rail, concrete slab layer and elastic medium to simulate the concrete base layer. The water-saturated subgrade surface layer is characterized by Biot's dynamic poroelastic theory, and the other subgrade components are regarded as elastic medium. The governing equations are formulated in a coordinate system traveling at a constant velocity, and the associated finite element formulation in a moving frame of reference is derived. The proposed computational scheme is applied to investigate the dynamic characteristics of the water-saturated subgrade surface layer subjected to the moving train load. The effects of various key parameters including the train velocity, permeability, drainage boundary, elastic modulus and rail irregularity on hydro-mechanical response of the saturated subgrade surface layer are carefully analyzed.

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Biot's Theory in the Finite Element Method

Cai¹,

Sun²

2017

Solutions for Biot's Poroelastic Theory in Key Engineering Fields

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Coupled simulation of wave propagation and water flow in soil induced by high‐speed trains

Cited by 11 publications

References 10 publications

Investigation of Water and Soil Migration and Mud Pumping of Subgrades under Traffic Load

Investigation of Water and Soil Migration and Mud Pumping of Subgrades under Traffic Load

Dynamic response of water saturated subgrade surface layer under high speed train using moving element method

Biot's Theory in the Finite Element Method

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