The paper presents the results of an experimental campaign carried out at the Sasso Poiano mine, close to Varese, northern Italy. The area is near a historic site, inhabited villages and a well-known lake, so that the use of explosive is subject to severe restrictions imposed by Italian standards. The exploitation is therefore carried out by blasting with low specific charge (PF=50 g/m3) in order to obtain...

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...

A global overview of the technologies that can be applied for modern tunnelling construction taking into account the OS&H aspects is shortly presented in the paper.

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...

Crossing hydrogeological and ecological sensitive aquifers, water ingress can occur, which can lead to irreversible damage to hydrogeological and ecological systems. In order to avoid this, the rock mass surrounding these hydrogeological sensitive tunnel sections is sealed by injections to reduce the hydraulic permeability, the water inflows and consequently the regional water level drawdowns. In deep tunnels, complete sealing is not possible due to the high water pressures.
Residual water volumes will continue to enter the tunnel. The magnitude...

This paper illustrates the geological-technical problems encountered in the design and construction of the Küchelberg road tunnel, which constitutes the second completion lot of the Merano bypass in the province of Bolzano, and in particular the characteristics of the specifically developed monitoring system. The tunnel layout runs in an urban environment with low overburden for approximately 2 km in two clearly distinct geological conditions that affect approximately 50% of the tunnel: the Merano side (west) in alluvial soils, the Passirio side...