The fragmentation process of the falling blocks is a key aspect in the study and the simulation of rockfall phenomenon. The single blocs can generate fragments, deviating their trajectory, modifying their energy. The present research describes an application of a fractal fragmentation model on a real study case and identifies the main issues that can rise. A multi-objective procedure to define model parameters...

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 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...

Rockfall net fences and drapery meshes constitute two of the most adopted protective structural works against rockfall hazard. During their life, they are subject to ageing, corrosion, and impact loads, with a consequent loss of efficiency or even effectiveness. Due to the variability of the environment and, more in general, to external conditions, a definition of a service life, although not unique but...

In shielded mechanized tunnelling, the annular void created during the advancement of a Tunnel Boring Machine (TBM) must be continuously filled to minimize surface settlements and ensure optimal contact between the segment lining and the surrounding soil. Two component grout is widely used in the backfilling process due to its ability to meet both operational and performance requirements. This grout system...

Bentonite slurries are essential for the operation of Slurry Tunnel Boring Machines (TBMs), helping to stabilize the excavation face, prevent soil collapse, and control groundwater inflow. This study examines the performance of a sodium-activated bentonite slurry used in tunnelling, focusing on its physical-chemical properties, rheological behavior, and interaction with soil. Tests were conducted to measure...