This paper describes a large station of the Lisbon Metro network constructed for the Oriente Line. The station consists of a large cavern with 22.5m maximum span and about 133m length. The station was developed along geological formations of the Miocene age with recent covering. A monitoring program for the station and adjacent buildings was prepared to assess the stability of the different excavation stages and to detect anomalous behaviour in the surroundings buildings located at one of the ends of the station. For the interpretation of the observed behaviour of the large underground structure and its interaction with the referred buildings, numerical analyses were performed.
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