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Os túneis são obras de engenharia de grande complexidade, desenvolvidas em meios com significativa variabilidade geológica, geotécnica e hidrogeológica. A execução destas estruturas implica lidar com elevados níveis de incerteza relativamente ao comportamento do maciço e às ações induzidas pelas escavações. Nesse contexto, a monitorização geotécnica torna-se essencial, permitindo reduzir a incerteza, verificar as hipóteses de projeto e antecipar situações de risco ou instabilidade. O presente estudo centra-se no caso concreto de uma obra do Metro do Porto- Linha Rubi, mais especificamente no sistema de instrumentação e monotorização
implementado na envolvente do Poço de Emergência e Ventilação (P1EV) e do respetivo Túnel de Ligação (TL1). A análise desenvolvida permitiu avaliar o desempenho do maciço e das estruturas adjacentes antes e durante a execução das escavações, ao evidenciar o impacto da obra em curso nas leituras registadas pelos dispositivos de monitorização, bem como a influência adicional de uma outra obra subterrânea em desenvolvimento nas imediações. Os resultados obtidos reforçam a relevância da monitorização geotécnica como ferramenta
essencial de gestão de risco em obras subterrâneas urbanas.
Tunnels are highly complex engineering works, developed in environments with significant geological, geotechnical, and hydrogeological variability. The execution of these structures involves dealing with high levels of uncertainty regarding the behaviour of the rock mass and the actions induced by excavations. In this context, geotechnical monitoring becomes essential, allowing uncertainty to be reduced, design hypotheses to be verified, and situations of risk or instability to be anticipated. This study focuses on the specific case of a Porto Metro project— the Ruby Line—more specifically on the instrumentation and monitoring system implemented in the vicinity of the Emergency and Ventilation Shaft (P1EV) and the respective Connection Tunnel (TL1). The analysis carried out made it possible to assess the performance of the rock mass and adjacent structures before and during the excavations, highlighting the impact of the ongoing work on the readings recorded by the monitoring devices, as well as the additional influence of another underground project under development in the vicinity. The results obtained reinforce the importance of geotechnical monitoring as an essential risk management tool in urban underground works.
Tunnels are highly complex engineering works, developed in environments with significant geological, geotechnical, and hydrogeological variability. The execution of these structures involves dealing with high levels of uncertainty regarding the behaviour of the rock mass and the actions induced by excavations. In this context, geotechnical monitoring becomes essential, allowing uncertainty to be reduced, design hypotheses to be verified, and situations of risk or instability to be anticipated. This study focuses on the specific case of a Porto Metro project— the Ruby Line—more specifically on the instrumentation and monitoring system implemented in the vicinity of the Emergency and Ventilation Shaft (P1EV) and the respective Connection Tunnel (TL1). The analysis carried out made it possible to assess the performance of the rock mass and adjacent structures before and during the excavations, highlighting the impact of the ongoing work on the readings recorded by the monitoring devices, as well as the additional influence of another underground project under development in the vicinity. The results obtained reinforce the importance of geotechnical monitoring as an essential risk management tool in urban underground works.
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Palavras-chave
Underground Tunnel Monitoring Instrumentation Devices Geotechnics Túnel subterrâneo Monitorização Dispositivos de instrumentação Geotecnia
