Dynamic Response of a Bridge–Embankment Transition with Emphasis on the Coupled Train–Track–Subgrade System

Hu, Peng; Zhang, Chunshun; Guo, Wei; Wang, Yonghe

doi:10.3390/app10175982

Cited by 9 publications

(9 citation statements)

References 14 publications

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“…Moreover, Guo studied the characterization of the geomechanical and water-vapor-absorption properties of deep soft rocks [26]. Modeling is another means of studying the feasibility of modified soft rock as subgrade material [27]. D. Xiao investigated the influence of cement-fly ash-gravel pile-supported approach embankments on abutment piles in soft ground [28].…”

Section: Additives Reference Findingsmentioning

confidence: 99%

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Applicability Study on Modified Argillaceous Slate as Subgrade Filling for High-Speed Railway

Guo

Wei

2022

Applied Sciences

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Modifying weathered argillaceous slate (WAS) to fill the subgrades of high-speed railways not only leads to obvious environmental benefits but also significantly saves natural resources. Previous studies have used several additives together with cement/quicklime. Using cement/quicklime as an additive would also improve the strength of weathered soft rock. Therefore, cement/quicklime can be used effectively as a sustainable solution. To illustrate the feasibility of cement/quicklime in WAS improvement, the mineral components and physical, mechanical and hydraulic characters for cement/quicklime-modified WAS were investigated via laboratory test. The dynamic behaviors were then analyzed by establishing a 3D vertical coupling dynamic model and performing dynamic triaxial tests. After mixing cement/quicklime, the following was proved: (1) The particles were coarsened, the content of kaolinite and amorphous phase increased, and the content of muscovite decreased, resulting in weakened hydrophilicity, reduced plasticity and enhanced water stability; (2) Mechanical and deformation characters were enhanced, reflecting an unconfined compression strength of quicklime/cement-modified soil greater than 0.5 MPa and elastic deformation for the subgrade of less than 0.1 mm; (3) For the quicklime-modified WAS, the dynamic strength was below the allowable value, and the sample disintegrated in water in 2 min, indicating it to be unsuitable for subgrade filling in HSR; (4) For cement-modified WAS, the water stability and dynamic strength were improved greatly, as well as the static strength. The sum of results highlights that 5% cement-modified WAS is recommended for filling subgrades of HSR for comprehensive factors.

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Section: Additives Reference Findingsmentioning

confidence: 99%

“…Thus, the total energy of the system is a sum of the energy of the above subsystems and using different elements of various characteristics will discretize it spaciously. The equation was resolved using the Newton-Raphson method [27,31].…”

Section: Dynamic Simulation Analysis Of Soft-rock-modified Soil As Su...mentioning

confidence: 99%

Applicability Study on Modified Argillaceous Slate as Subgrade Filling for High-Speed Railway

Guo

Wei

2022

Applied Sciences

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“…The ANSYS Ver 17.2 [16] software package was used to conduct the 3D finite element (FE) analysis in this study by employing solid elements. The lower part of the concrete bed was fixed under supported conditions; the vertical load was considered as the displacement condition (5-40 mm).…”

Section: Finite Element Analysismentioning

confidence: 99%

“…Furthermore, Wang et al [15] performed finite element analysis (FEA) to explain the connection due to an increase in dynamic wheel load in the transition zone when there was high moisture and connection; they confirmed that high moisture is a source of transition zone problems. Therefore, a study was conducted to analyze the structural behavior of the train-track system through several experiments and FEA [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Behavior Characteristics of a Booted Sleeper Track System According to Substructure Deformation

2021

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In booted sleeper floating track systems wherein the concrete bed, rail, and sleeper are structurally separated, mismatches can occur between the substructure and track owing to deformations. Nevertheless, the mutual behavior between substructures and track systems has not been studied extensively. To address this limitation, the effect of substructure uplift and subsidence on the deformation of a boosted sleeper floating track system installed in a subway box tunnel was analyzed using finite element analysis. A detailed three-dimensional model consisting of all track system components was constructed to determine the interaction between the rail and concrete bed. The sleepers were observed to rotate in response to substructure deformation, and their resulting contact conditions on the concrete bed were analyzed to determine the track status accordingly. The zones of likely tension and shear cracking in the concrete bed were then determined to provide focus areas for track design and maintenance efforts. The results of this study can be used to improve the design and inspection of floating track systems to ensure the safety and functionality of railway tunnels in areas likely to experience uplift or subsidence.

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“…ese research studies of medium-low-speed maglev lines mainly focus on an overpass. Low-lying sections also adopt the forms of the low-bearing platform and simply supported beam [12]. Seldom researches focus on low-lying structure in which rail bearing beam is directly placed on the subgrade.…”

Section: Background and Objectivesmentioning

confidence: 99%

Numerical Analysis of a New Block‐Type Rail Bearing Beam for the Mid‐Low‐Speed Maglev Train

Wang

Xie

et al. 2021

Advances in Civil Engineering

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In this study, a new block-type rail bearing beam is presented, which consists of a cast-in-place base and prefabricated blocks. The finite element analysis is conducted to assess the proposed new rail bearing beam structure. The performed finite element method (FEM) simulation focused on the dynamic stress at the bottom of the rail bearing beam and structural internal force and deformation under the case of train loading, etc. Besides, the relationship between first-order natural frequency and activation frequency in the new support rail beam structure is analyzed and the beneficial effects on the internode connection structure are quantified. The results show that the increase in driving speed has the most significant effect on the vertical acceleration of the structure, and the self-vibration frequency of the structure is relatively large, which means the structure is safe. Since previous research seldom focuses on this block-type rail bearing beam, this study lays a valuable foundation for the construction of a rail bearing beam for the mid-low-speed maglev train.

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Dynamic Response of a Bridge–Embankment Transition with Emphasis on the Coupled Train–Track–Subgrade System

Cited by 9 publications

References 14 publications

Applicability Study on Modified Argillaceous Slate as Subgrade Filling for High-Speed Railway

Applicability Study on Modified Argillaceous Slate as Subgrade Filling for High-Speed Railway

Behavior Characteristics of a Booted Sleeper Track System According to Substructure Deformation

Numerical Analysis of a New Block‐Type Rail Bearing Beam for the Mid‐Low‐Speed Maglev Train

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