Proposition for in Situ Evaluation of Geotechnical and Structural Aspects of a Heavy Haul Track

Costa, Robson Correia da; Pires, J.; Moura, Edson de; Motta, Rosângela dos Santos; Castro, Gabriela Salim de; Bernucci, Liedi Légi Bariani; Oliveira, Luciano de

doi:10.1007/978-3-030-77234-5_61

Cited by 2 publications

(4 citation statements)

References 12 publications

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“…section (X-Y) aligned with the axle load.In terms of the results on the stresses and displacements obtained during the second calibration analysis, reasonable values were observed. Studies by Indraratna et al [9] and Costa et al [58] reported similar values, with vertical stresses around 280, 75, and 60 kPa at the sleeper-ballast, ballast-sub-ballast, and sub-ballast-subgrade interfaces, along with track vertical displacements of approximately 3 mm. The material characteristics and load conditions applied in the numerical model were also comparable with the field investigations and monitoring studies of Indraratna and Nimbalkar [25] and Wang and Markine [63].…”

Section: Resultsmentioning

confidence: 57%

“…The RM of the ballast material was determined using a large-scale triaxial test, in accordance with the methodology outlined in detail by Costa et al [58] and Merheb et al [59] to prepare the specimen and to perform the test, which can be summarised as (i) fixing a latex membrane in a steel base; (ii) separating and inserting different homogenised portions of the material into the membrane; (iii) compacting the resulting material with a Regarding the SPAB soil, it contains almost 30% kaolinite and 2% hematite, which can contribute to better mechanical behaviour compared to Itapeti soil. Furthermore, 40% hematite or iron ore and presence of kaolinite clay mineral could be observed in the fouled ballast waste materials, possibly originating from material falling off the wagon during transport and/or from existing sub-ballast/subgrade materials.…”

Section: Mechanical Characterisationmentioning

confidence: 99%

Section: Mechanical Characterisationmentioning

confidence: 99%

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Evaluating Different Track Sub-Ballast Solutions Considering Traffic Loads and Sustainability

Castro,

Saico,

de Moura

et al. 2024

Infrastructures

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The railway industry is seeking high-performance and sustainable solutions for sub-ballast materials, particularly in light of increasing cargo transport demands and climate events. The meticulous design and construction of track bed geomaterials play a crucial role in ensuring an extended track service life. The global push for sustainability has prompted the evaluation of recycling ballast waste within the railway sector, aiming to mitigate environmental contamination, reduce the consumption of natural resources, and lower costs. This study explores materials for application and compaction using a formation rehabilitation machine equipped with an integrated ballast recycling system designed for heavy haul railways. Two recycled ballast-stabilised soil materials underwent investigation, meeting the necessary grain size distribution for the proper compaction and structural conditions. One utilised a low-bearing-capacity silty sand soil stabilised with recycled ballast fouled waste (RFBW) with iron ore at a 3:7 weight ratio, while the second was stabilised with 3% cement. Laboratory tests were conducted to assess their physical, chemical, and mechanical properties, and a non-linear elastic finite element numerical model was developed to evaluate the potential of these alternative solutions for railway sub-ballast. The findings indicate the significant potential of using soils stabilised with recycled fouled ballast as sub-ballast for heavy haul tracks, underscoring the advantages of adopting sustainable sub-ballast solutions through the reuse of crushed deteriorated ballast material.

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Section: Resultsmentioning

confidence: 57%

Section: Mechanical Characterisationmentioning

confidence: 99%

Section: Mechanical Characterisationmentioning

confidence: 99%

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Evaluating Different Track Sub-Ballast Solutions Considering Traffic Loads and Sustainability

Castro,

Saico,

de Moura

et al. 2024

Infrastructures

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“…In the EFC, the key railway vehicle is the GDE wagon of which the distance between axles and the adjacent bogies are 1828 mm and 2562 mm, respectively, considering this configuration of the bogies as the greatest load solicitation due to the effect of superposition that the wheel loads cause into the track. 32,33 In this study, a straight segment is chosen as the initial focus is on vertical levelling of the track geometry. As different types of finite elements (FE) enable a variety of structures or components, the EFC's track can be modelled in both two and three dimensions.…”

Section: Methodsmentioning

confidence: 99%

A Novel Hybrid Method for Predicting Vertical Levelling Loss of Railway Track Geometry Under Dynamic Cyclic Loadings

Melo

Kaewunruen

Papaelias

et al. 2022

Int. J. Str. Stab. Dyn.

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With an emphasis on the integrated deterioration of railway track geometry and components, a new hybrid numerical-analytical method is proposed for the predictive analysis of track geometrical vertical levelling loss (VLL). In contrast to previous studies showing a dependency on the number of cycles, this research unprecedentedly incorporates the influence of operational, vehicle and track conditions. The numerical models are carried out using an explicit finite element (FE) package under cyclic loadings, and then, their outcomes are iteratively regressed by an analytical logarithmic function that accumulates permanent deformations in order to quantify VLL over a long term. The results are first compared with other previous studies, indicating a very good agreement with them. Then, field measurements have been used to further verify the results. In this study, parametric simulations are performed varying three key parameters: axle load, train velocity and ballast tangent stiffness. The parametric studies exhibit that the rate of VLL raises about 50% if the axle load increases only from 30 ton to 40 ton for a freight train running at 70[Formula: see text]km/h on a stiffer ballast track. In contrast, for a 25-tonnes-axle-load train running from 60[Formula: see text]km/h to 100[Formula: see text]km/h on a similar track, the vertical levelling degradation reduces by approximately 20%. The main findings suggest that higher axle loads contribute significantly to the VLL due higher contact forces and, on the other hand, a lower train speed does not necessarily imply a low rate of VLL since the influence of train velocities on track geometry (VLL) is associated with the natural frequencies (or wavelengths) of the ballasted railway track. The insight demonstrates that the load frequencies play a key role on the deterioration of VLL.

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Proposition for in Situ Evaluation of Geotechnical and Structural Aspects of a Heavy Haul Track

Cited by 2 publications

References 12 publications

Evaluating Different Track Sub-Ballast Solutions Considering Traffic Loads and Sustainability

Evaluating Different Track Sub-Ballast Solutions Considering Traffic Loads and Sustainability

A Novel Hybrid Method for Predicting Vertical Levelling Loss of Railway Track Geometry Under Dynamic Cyclic Loadings

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