Effect of Particle Size Distribution and Packing Characteristics on Railroad Ballast Shear Strength: A Numerical Study Using the Discrete Element Method

Mahmud, S. M. Naziur

doi:10.18122/b29d8k

Cited by 2 publications

(1 citation statement)

References 77 publications

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“…The "soft contact" approach assumes that interaction of spheres is represented by assigning each sphere a stiffness and allowing them to overlap. The extent of overlap is used in conjunction with a contact force law to give instantaneous forces from knowledge of the current positions, orientations, velocities, and spins of the particles [30,31]. The calculation cycle of a DEM simulation are schematically represented in Figure 1.…”

Section: Dem Simulation Of Direct Shear Testmentioning

confidence: 99%

Discrete Element Analysis of the Strength Anisotropy of Fiber-Reinforced Sands Subjected to Direct Shear Load

2020

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Soil reinforcement with natural or synthetic fibers enhances its mechanical behavior in various applications. Fiber-reinforced sands (FRS) can be relatively anisotropic because of the fiber self-weight and the compaction technique. However, the microscopic mechanisms underlying the anisotropy are still poorly understood. This study used a discrete element approach to analyze the microscopic mechanisms underlying the strength anisotropy of FRS due to fiber orientation. Analysis of contact networks revealed that the optimum fiber orientation angle is perpendicular to the main direction of strong contact force in direct shear testing. These fibers produced the largest increase in shear zone thickness, normal force around the fiber body, effective contact area, tensile force along fibers, and energy storage/dissipation. This study is valuable for further understanding of the mechanical behaviors of FRS.

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Section: Dem Simulation Of Direct Shear Testmentioning

confidence: 99%

Discrete Element Analysis of the Strength Anisotropy of Fiber-Reinforced Sands Subjected to Direct Shear Load

2020

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Kelio dangos konstrukcijos nesurištųjų pagrindo sluoksnių tamprumo modulio ir atsparumo liekamosioms deformacijoms priklausomybės nuo užpildų fizinių ir mechaninių savybių tyrimas

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Vadovas prof. dr. Audrius VAITKUS (Vilniaus Gedimino technikos universitetas, statybos inžinerija -T 002). Vilniaus Gedimino technikos universiteto Statybos inžinerijos mokslo krypties disertacijos gynimo taryba: Pirmininkas prof. dr. Darius BAČINSKAS (Vilniaus Gedimino technikos universitetas, statybos inžinerija -T 002). Nariai: prof. dr. Donatas ČYGAS (Vilniaus Gedimino technikos universitetas, statybos inžinerija -T 002), prof. dr. Sigurdur ERLINGSSON (Islandijos universitetas, Islandija, statybos inžinerija -T 002), doc. dr. Vaidas LUKOŠEVIČIUS (Kauno technologijos universitetas, transporto inžinerija -T 003), prof. habil. dr. Henrikas SIVILEVIČIUS (Vilniaus Gedimino technikos universitetas, statybos inžinerija -T 002). Disertacija bus ginama viešame Statybos inžinerijos mokslo krypties disertacijos gynimo tarybos posėdyje 2022 m. gruodžio 12 d. 10 val. Vilniaus Gedimino technikos universiteto Senato posėdžių salėje.

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Effect of Particle Size Distribution and Packing Characteristics on Railroad Ballast Shear Strength: A Numerical Study Using the Discrete Element Method

Cited by 2 publications

References 77 publications

Discrete Element Analysis of the Strength Anisotropy of Fiber-Reinforced Sands Subjected to Direct Shear Load

Discrete Element Analysis of the Strength Anisotropy of Fiber-Reinforced Sands Subjected to Direct Shear Load

Kelio dangos konstrukcijos nesurištųjų pagrindo sluoksnių tamprumo modulio ir atsparumo liekamosioms deformacijoms priklausomybės nuo užpildų fizinių ir mechaninių savybių tyrimas

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