The underground section of the T6 tramway near Paris - EPB Tunneling with low overburden in an urban area
The underground section of the LRT T6 line will extend the public transport network towards the West of Paris and create new connections. The project consists of a 600m at-grade section followed by a 1500m long tunnel of 9.15m diameter, with two underground stations of 25m depth. Geologically the project is situated in a heterogeneous sedimentary sequence consisting of a series of marls, limestone and fine sand, typical for the Paris region. Settlement control is a major challenge of the project. Construction measures such as structural reinforcement of existing buildings and sophisticated monitoring systems have been implemented in order to anticipate and to avert any potential disturbance which might have a negative impact on the environment. This paper presents a comparison between 3D Finite Elements modelling and observed ground deformations.