Behaviour of a geosynthetic reinforced steep slope constructed with cohesive backfill under earthquake loading

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2013

Autores

Castorina Silva Vieira (Autor) FEUP; Maria de Lurdes Lopes (Autor) FEUP

Ata de Conferência Internacional

Título: ECCOMAS Thematic Conference - COMPDYN 2013: 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, Proceedings - An IACM Special Interest Conference

Páginas: 2708-2721

4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2013

Kos Island, 12 June 2013 through 14 June 2013

Indexação

Scopus - 1 Citação

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia civil

CORDIS: Ciências Tecnológicas > Engenharia

Outras Informações

ID Authenticus: P-009-CKS

DOI: 10.7712/120113.4698.c1240

Abstract (EN): The use of geosynthetics as reinforcement elements of granular backfills has been widely used and their behaviour either during the service life or under seismic loading has been studied by several authors [1, 2]. However the use of fine grained soils, often referred as marginal fills, are not strongly implemented and, since they are susceptible for pore water pressure, not recommended by some international guidelines and standards. The use of soils locally available has cost benefits and sustainable gains. Therefore it is important to study the behaviour of geosynthetic reinforced steep slopes constructed with cohesive backfills. In this work the two-dimensional finite difference program Fast Lagrangian Analysis of Continua (FLAC) was used to model the seismic behaviour of an 8.4 m high geogrid-reinforced steep slope. The embankment was reinforced with 14 horizontal reinforcement layers and its face is inclined of 60°. The seismic behaviour of the structure constructed with cohesive backfill was compared to its behaviour if a granular material was selected. Two constitutive models were used to model the cohesive backfills: the Mohr-Coulomb model and a Strain-Softening model. In order to investigate the influence of input motion on the seismic behaviour of the structure, two earthquake ground motions artificially generated and two variable amplitude harmonic motions were considered. The numerical simulations of the structure behaviour under seismic loading showed that the possible decrease of the backfill shear strength properties with the shear strain during cycling is an important issue. Even so, it could be concluded that a well compacted and drained cohesive soil can be used as backfill material in geosynthetic reinforced steep slopes.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Notas: Paper No. 1240

Nº de páginas: 14