Utilize este identificador para referenciar este registo:
http://hdl.handle.net/10071/20356
Autoria: | Jerónimo, P. Resende, R. Fortunato, E. |
Data: | 2020 |
Título próprio: | An assessment of contact and laser-based scanning of rock particles for railway ballast |
Volume: | 22 |
ISSN: | 2214-3912 |
DOI (Digital Object Identifier): | 10.1016/j.trgeo.2019.100302 |
Palavras-chave: | Railway ballast Particle shape 3D scanning Laser Contact scanning Rock breakage |
Resumo: | Performance of traditional railway structure depends significantly on the behaviour of its support layers, particularly the ballast. This layer’s rock particles are selected to ensure high mechanical strength, but traffic and mechanical maintenance break and wear the particles. Consequently, the layer incurs permanent deformations that degrade its strength and increase deformability and permeability. Particle physical characteristics, in particular those related to size and shape, influence their fragmentation and wear and must be studied accordingly. In addition, structural numerical models that represent individual particles, such as the discrete element method, have been increasingly used to model the infrastructure and therefore detailed geometrical characterization in the form of 3D digital models of the particles are necessary. This work contributes to this goal by investigating a contact-based cost-effective method that digitizes particle form and allows the determination of their geometric parameters. This method is described, compared with well-established laser scanning technique and then applied to study degradation of particles in Los Angeles and microDeval fragmentation tests. |
Arbitragem científica: | yes |
Acesso: | Acesso Aberto |
Aparece nas coleções: | ISTAR-RI - Artigos em revistas científicas internacionais com arbitragem científica |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1-s2.0-S2214391219301394-An assessment of contact and laser-based scanning of rock particles for.pdf | Versão Editora | 4,27 MB | Adobe PDF | Ver/Abrir |
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