Desempenho a curto e longo prazo de uma via em laje em zona de transição: análise de aterro para túnel
DOI:
https://doi.org/10.14195/2184-8394_157_3Palavras-chave:
zonas de transição, via em laje, deformação permanenteResumo
As zonas de transição de vias-férreas são caracterizadas por uma mudança abrupta na rigidez das condições de suporte da via, o que conduz ao aumento das cargas dinâmicas e aceleração dos assentamentos diferenciais e degradação da via. Este trabalho apresenta o estudo do comportamento da via em laje em zonas de transição, com especial destaque para as secções aterro-túnel. Esta análise usa uma metodologia híbrida que combina a modelação tridimensional por elementos finitos com as equações empíricas de deformação permanente, inseridas num processo iterativo. Em cada iteração, são determinados os campos de tensão induzidos na fundação usando o modelo 3D, antes de se calcularem as deformações a partir da equação empírica calibrada capaz de determinar o assentamento ao longo da transição. Seguidamente, antes de iniciar a próxima iteração, estes assentamentos são utilizados para modificar a geometria do modelo 3D, o que permite considerar os efeitos do assentamento anterior. Relativamente ao comportamento dinâmico a curto-prazo, os resultados mostram uma concentração de tensões na laje de betão e HBL. Em relação ao comportamento a longo prazo, os resultados mostram um assentamento permanente máximo acumulado próximo de 0.52 mm. Mais ainda, foi testada a eficácia de uma manta resiliente na zona do túnel e no aterro. Os resultados mostram uma diminuição do nível de tensões na transição e atenuação da variação dos deslocamentos na laje de betão.
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