A study of the interaction between the new C Line of Roma Underground and the Aurelian Wall

A study of the effects of the construction of the C Line of Roma Underground on the Aurelian Wall has been carried out as a research project sponsored by the municipality of Roma through STA S.p.A. This paper summarises the results of the study for a section where the two closed-shield (10 m in diameter) running tunnels pass directly beneath the Wall, with a skew of about 45 ? . At first, ground movements induced from construction of the tunnels, for different positions of the excavation face, were estimated in greenfield conditions using empirical methods. In a second stage, three dimensional finite difference analyses were carried out to simulate the interaction between the Wall and the construction of the tunnels. A distinctive feature of the research was the extended investigation aimed at an adequate definition of a model of the subsoil and of the geometry and quality of the foundations of the Wall.