Settlement analysis using a generic ballasted track simulation package

Shih, Jou Yi; Grossoni, Ilaria; Bezin, Yann

doi:10.1016/j.trgeo.2019.100249

Cited by 13 publications

(5 citation statements)

References 35 publications

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“…The elasticity and plasticity of clay can be described by the hook body and the Newtonian dashpot, respectively, while the viscoelasticity of clay can be described by a constant-order fractional Abel dashpot, as shown in Figure 6. The constitutive relationship of the Abel dashpot is given as [45] 𝜎(𝑡) = 𝜂𝐷 𝜀(𝑡) (11) where 𝜂 is the viscosity coefficient, 0 ≤ 𝛼 ≤ 1, and 𝐷 indicates fractional differentiation.…”

Section: The Constant-order Fractional Abel Dashpotmentioning

confidence: 99%

“…Based on elastoplastic theory, many dynamic constitutive models capable of predicting accumulative strain of soil have been proposed [6][7][8][9]. With the introduction of numerical simulation approaches, several authors have developed constitutive models to capture the effects of cyclic loading on traffic settlement [10][11][12]. Furthermore, based on general thermodynamic principles and Newton's laws of motion, Deng and other authors [13] presented a constitutive model to explore the dynamic response of soft clay under dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

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A Variable-Order Dynamic Constitutive Model for Clay Based on the Fractional Calculus

Zhang

Chen

et al. 2022

Applied Sciences

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To accurately describe the deformation characteristics of clay under long-term cyclic load, based on fractional calculus theory, elastoplastic theory and the basic element model, a variable-order fractional dynamic model designed to predict accumulative strain of clay was exhibited. Firstly, the cyclic load was separated into static and alternating load in accordance with cyclic load characteristics, and the strain of clay under static and alternating load was analyzed. Then, on the basis of the variable-order Abel dashpot model, rheological theory and elastoplastic theory, the expressions of the rheological constitutive model and strain response were both obtained. Finally, in combination with the undrained dynamic triaxial testing of Zhan Jiang clay and Tian Jin soft clay, a series of analyses was carried out on the effectiveness and parameter sensitivity of the model when subjected to long-term cyclic loading. By comparing the dynamic constitutive model with pre-existing models, the superiority of the dynamic constitutive model is revealed. The results show that the dynamic constitutive model can characterize properly the deformation characteristics of clay under the action of long-term cyclic loading, especially in its accelerating stage. The parameter sensitivity of the model exhibits a growing trend with the increment of loading duration.

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Section: The Constant-order Fractional Abel Dashpotmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Variable-Order Dynamic Constitutive Model for Clay Based on the Fractional Calculus

Zhang

Chen

et al. 2022

Applied Sciences

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“…These can be implemented within a finite element model, however the discrete element method (DEM) can also be used to simulate local deformations and heterogeneous particle displacements (Guo et al, 2020;Saussine et al, 2006). Considering the FE approach, an implementation in 3D made in a commercial FE software combining with an elasto-plastic constitutive model was presented by (Shih et al, 2019) to calculate differential settlement in ballasted tracks.…”

Section: Introductionmentioning

confidence: 99%

Analytical forecasting of long-term railway track settlement

Charoenwong

Connolly

Woodward

et al. 2022

Computers and Geotechnics

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“…While many authors have studied the transient train-track interaction at transition zones using tri-dimensional numerical approaches (Wang et al, 2017;Paixão et al, 2018;Ngamkhanong et al, 2020), others have proposed 3D FEM models with true tridimensional plastic deformation formulations to simulate the development of settlements, but mostly focusing on aspects other than transition zones. For example, Li et al (2016) and Shih et al (2019) presented implementations in commercial FEM software, but limited the analysis to very short sections of track and considered the static loading only (no vehicle-track interaction). Shan et al (2017) developed a more robust framework to study slab track transition zones to bridges that considered the vehicle-track dynamic interaction to study the impact of the differential settlements at the approach to the structures.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior in Transition Zones and Long-Term Railway Track Performance

Paixão

Varandas

Fortunato

2021

Front. Built Environ.

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Transition zones between embankments and bridges or tunnels are examples of critical assets of the railway infrastructure. These locations often exhibit higher degradations rates, mostly due to the development of differential settlements, which amplify the dynamic train-track interaction, thus further accelerating the development of settlements and deteriorating track components and vehicles. Despite the technical and scientific interest in predicting the long-term behavior of transition zones, few studies have been able to develop a robust approach that could accurately simulate this complex structural response. To address this topic, this work presents a three-dimensional finite element (3D FEM) approach to simulate the long-term behavior of railway tracks at transition zones. The approach considers both plastic deformation of the ballast layer using a high-cycle strain accumulation model and the non-linearity of the dynamic vehicle-track interaction that results from the evolution of the deformed states of the track itself. The results shed some light into the behavior of transition zones and evidence the complex long-term response of this structures and its interdependency with the transient response of the train-track interaction. Aspects that are critical when assessing the performance of these systems are analyzed in detail, which might be of relevance for researchers and practitioners in the design, construction, and maintenance processes.

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Settlement analysis using a generic ballasted track simulation package

Cited by 13 publications

References 35 publications

A Variable-Order Dynamic Constitutive Model for Clay Based on the Fractional Calculus

A Variable-Order Dynamic Constitutive Model for Clay Based on the Fractional Calculus

Analytical forecasting of long-term railway track settlement

Dynamic Behavior in Transition Zones and Long-Term Railway Track Performance

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