ABSTRACT
Construction of underground works in densely built-up areas involves dealing with the potential impact of tunnelling-induced displacements on adjacent buildings and infrastructure. This paper presents the methodology and discusses the results of a numerical model analysis carried out at a feasibility stage to assess the stability conditions and displacements caused by the excavation of a large-span shallow underground mined metro station cavern and ancillary tunnels for Sydney Metro in a densely built-up area in Sydney’s Central Business District. Emphasis was given to the modelling of the tunnel excavation and support sequence to capture relevant failure mechanisms and potential impact on nearby infrastructure.
