The two-component backfilling system is the most frequently used method to fill the annular gap created during the shield machine advancement. This gap, due to the head overcut, the shield thickness and conicity and the tail brushes size should be filled continuously in order to avoid mainly surface displacement and linings movements. Nowadays this technology is the most chosen due to operative (both...

TELT is the public sponsor of one of the world’s most important projects, the cross-border section of the new Turin-Lyon line. In 2015 the company became a member of the United Nations Global Compact, adhering to the ten principles in terms of human rights, the environment, the fight against corruption and compliance with international labour standards. This commitment led to the undertaking to constantly...

The author describes the decision-making processes that led to the adoption of the pedestrian detection system, from the risk analysis phase in the specific site to the management one, through the implementation of the Z-safe project. The completion of the system was possible thanks to the different tests conducted on in situ devices.

The tunnel Piscopio I is a twin-tube tunnel, 750 m long, included in the works of the Maxilotto 2 DG21/04 of the new highway SS 106 Jonica (Calabria, Southern Italy). During the excavation of the Piscopio I tunnel, several lacks in the Geological Model of Reference emerged. Above all, the discovery of a complex landslide along the left hydrographic side of the Alessi River, which interfered with the tunnel...

The interaction between tunnels and underground water is a complex topic and it is of great relevance taking into account the environment, the protection of drinkable water and the interference with tunnel construction method. Due to the great importance of the topic, in the following are presented and discussed the most relevant technologies for water management in tunnelling with a specific attention...