Effects of particle size distribution and lithology on the resistance to breakage of ballast materials

Rosa, André Fardin; Aragão, Francisco Thiago Sacramento; Motta, Laura Maria Goretti da

doi:10.1016/j.conbuildmat.2020.121015

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…The experimental results in this study show that compaction-induced ballast breakage is mainly corner breakage. Currently, most DEM simulations in the literature that are able to simulate ballast breakage are either focused only on breakage during the triaxial shearing process or hardly consider corner breakage (21, 22). To properly simulate the ballast corner breakage during compaction and the effect of corner breakage on ballast mechanical behavior remains an open challenge.…”

Section: Dem Simulationsmentioning

confidence: 99%

Investigation of Railway Ballast Breakage Through Large-Scale Triaxial Tests and a New Particle Breakage Approach in Discrete Element Modeling

Huang

Qian

2023

Transportation Research Record: Journal of the Transportation R

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Crushed aggregates with irregular shapes and sharp corners are preferred ballast materials to ensure proper track bearing capacity because of good contact between the particles. Meanwhile, crushed aggregates are prone to deterioration and breakage under repeated train loads. The effect of particle degradation on the mechanical behavior of ballast has been investigated before, but previous research rarely separates ballast breakage during sample compaction from breakage during shearing. This study investigates ballast particle breakage at different stages through large-scale triaxial tests and discrete element modeling. The results show that corner breakage is the primary particle breakage mode and mostly happens during compaction instead of during the shearing process. The results also indicate ballast corner breakage during sample compaction would increase the peak strength of the ballast but would not change Young’s modulus. A rubber pad is strongly recommended to reduce ballast breakage during the triaxial test sample compaction.

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Section: Dem Simulationsmentioning

confidence: 99%

Investigation of Railway Ballast Breakage Through Large-Scale Triaxial Tests and a New Particle Breakage Approach in Discrete Element Modeling

Huang

Qian

2023

Transportation Research Record: Journal of the Transportation R

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“…Table 1 presents a summary of the remaining physical parameters pertaining to the walnut. [20,21] simplifies walnuts into a spherical shape. Therefore, following the methodology in [18], the equivalent spheroid diameter was derived by measuring dimensional parameters (length, width, and thickness, as illustrated in Figure 1) for two hundred walnuts.…”

Section: Preparation Of the Walnut Samplesmentioning

confidence: 99%

“…Precisely, the 37 mm size represents an average within the 36-38 mm range. In accordance with our prior research [21], the walnut samples were placed in sealed bottles before each experiment and stored in a climate-controlled room at 60% relative humidity and 21 °C to sustain consistent moisture content. It is important to highlight that particular conditions, Typically, theoretical and simulated research [20,21] simplifies walnuts into a spherical shape.…”

Section: Preparation Of the Walnut Samplesmentioning

confidence: 99%

“…In accordance with our prior research [21], the walnut samples were placed in sealed bottles before each experiment and stored in a climate-controlled room at 60% relative humidity and 21 °C to sustain consistent moisture content. It is important to highlight that particular conditions, Typically, theoretical and simulated research [20,21] simplifies walnuts into a spherical shape. Therefore, following the methodology in [18], the equivalent spheroid diameter was derived by measuring dimensional parameters (length, width, and thickness, as illustrated in Figure 1) for two hundred walnuts.…”

Section: Preparation Of the Walnut Samplesmentioning

confidence: 99%

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Study on the Relationship between Crack Initiation and Crack Bifurcation in Walnut Shells Based on Energy

Man,

Li,

Zhang

et al. 2023

Agriculture

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Clarifying the dissipated energy required for crack expansion is an effective way to control material crushing. Therefore, based on the material fracture probability model and fractal theory, the energy range required for crack extension was determined, and the morphology of the cracks was quantified. This study investigates the influence of walnut size on crack propagation characteristics; this includes its effects on the crack initiation threshold energy, representing resistance to crack initiation, and the crack bifurcation threshold energy, representing resistance to crack bifurcation. The results show that crack extension has a well-defined threshold energy below which cracks do not initiate or bifurcate. The size of walnuts significantly impacts crack propagation characteristics, showing that both crack initiation threshold energy and crack bifurcation threshold energy decrease with increasing walnut sizes. In addition, there is a positive correlation function between the crack initiation threshold energy and the crack bifurcation threshold energy. The experimental results can offer fresh insights into material fracture prediction and serve as a reference for numerical simulations.

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Study on the particle breakage of coral sand in the ring shear experiment

Zheng,

Zhang,

Mao

et al. 2024

Bull Eng Geol Environ

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Effects of particle size distribution and lithology on the resistance to breakage of ballast materials

Cited by 12 publications

References 19 publications

Investigation of Railway Ballast Breakage Through Large-Scale Triaxial Tests and a New Particle Breakage Approach in Discrete Element Modeling

Investigation of Railway Ballast Breakage Through Large-Scale Triaxial Tests and a New Particle Breakage Approach in Discrete Element Modeling

Study on the Relationship between Crack Initiation and Crack Bifurcation in Walnut Shells Based on Energy

Study on the particle breakage of coral sand in the ring shear experiment

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