ABSTRACT
This paper describes a large station of the Lisbon Metro network that consists of a large cavern with 22.5m maximum span, 14.8m high and about 133m length. The station was driven by underground construction according to a shotcrete sequential method. The station was developed along geological formations of the Miocene age with recent covering. A monitoring program was prepared to assess the stability of the different excavation stages and to detect anomalous behaviour in the surrounding buildings located at Chelas side the end of the station. Numerical analyses were performed for the interpretation of the observed behaviour of the large underground structure and its interaction with neighbouring buildings.
