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O quebra-mar norte do porto da Nazaré foi reconstruído após ter sofrido grandes danos
durante as tempestades marítimas de 2012/2013 e 2013/2014. Inicialmente pensou-se que
esta deterioração se deveu ao impacto direto das ondas. Após algumas observações esta ideia
foi reavaliada e foi sugerido que o mecanismo de rotura era devido à liquefação induzida pela
ondulação. Isto significa um aumento gradual da pressão intersticial devido à ação cíclica das
ondas, sendo que para isso ocorrer é necessário um solo onde a dissipação desta pressão seja
inferior à acumulação da mesma pressão, fazendo com que o solo e a água se comportem em
conjunto como um líquido.
Para verificar se este fenómeno é, de facto, a causa do mecanismo de rotura, idealizou-
se a instrumentação e a monitorização geotécnica das pressões intersticiais tanto na camada
de fundação do quebra-mar como dentro do próprio quebra-mar, bem como a recolha de
amostras de solo para a realização de ensaios laboratoriais.
The northern breakwater of Nazaré's harbor underwent reconstruction after it suffered heavy damage during ocean storms of 2012/2013 and 2013/2014. The initial thought for this deterioration was that of the direct impact of the waves. After some observation this idea was reevaluated, and it was suggested that the failure mechanism was due to wave-induced lique- faction. This means a gradual build-up of pore-water pressure due to wave cycles, where for this to occur it needs a soil where the dissipation of this pressure does not match the rate of increase of the same pressure, causing both the water and the sediment to act together as a liquid. To verify if this phenomenon is in fact the cause of failure, the instrumentation and ge- otechnical monitoring of the pore-water pressures in the foundation layer of the breakwater and inside the breakwater itself were idealized, as well the collection of soil samples for further testing.
The northern breakwater of Nazaré's harbor underwent reconstruction after it suffered heavy damage during ocean storms of 2012/2013 and 2013/2014. The initial thought for this deterioration was that of the direct impact of the waves. After some observation this idea was reevaluated, and it was suggested that the failure mechanism was due to wave-induced lique- faction. This means a gradual build-up of pore-water pressure due to wave cycles, where for this to occur it needs a soil where the dissipation of this pressure does not match the rate of increase of the same pressure, causing both the water and the sediment to act together as a liquid. To verify if this phenomenon is in fact the cause of failure, the instrumentation and ge- otechnical monitoring of the pore-water pressures in the foundation layer of the breakwater and inside the breakwater itself were idealized, as well the collection of soil samples for further testing.
Descrição
Palavras-chave
Quebra-mar Liquefação pela ondulação Instrumentação e Monitorização Ensaios laboratoriais
