Liquefação de solos à luz da mecânica aplicada
DOI:
https://doi.org/10.14195/2184-8394_128_1Palabras clave:
Liquefação cíclica e estática, estados críticos, ondas sísmicasResumen
Há uma crescente convicção da vantagem em encarar o fenómeno de liquefação de solos como passível de ser considerado como um comportamento elastoplástico que é modelável a partir de conceitos baseados em estados críticos, enquanto se reconhece que pode ocorrer num largo espectro de materiais e con dições. Estes assuntos são desenvolvidos neste artigo, atendendo a que as ferramentas de estados críticos têm sido estendidas a outros materiais para além das areias. Esta abordagem integra o conhecimento da influência que a micromecânica das partículas e dos seus contactos tem no comportamento dos solos, e tem em conside ração os efeitos da quebra progressiva das partículas e as alterações do grau de uniformidade dos solos no de curso do carregamento. Os objetivos do dimensionamento com base em comportamento são apresentados à luz de ensaios em laboratório e de campo que permitem identificar o risco de se espoletar o fenómeno de lique fação, tanto em condições cíclicas, como estáticas. Também será discutida a forma como os resultados desses ensaios podem ser interpretados para se poder prever o fenómeno, à luz de uma abordagem mecânica global.
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