L'edizione 2020 del WTC, unitamente alla 46esima Assemblea Generale ITA-AITES, si è svolta lo scorso 11-17 settembre in modalità interamente digitale, nel rispetto delle vigenti normative anti-Covid. L'evento di quest'anno si è incentrato sul tema "Innovation and Sustainable Underground Serving Global Connectivity", trattando le ultime innovazioni, tendenze e progressi del settore del tunnelling (dallo sviluppo del progetto alla costruzione dei tunnel, sino alle strategie di gestione e manutenzione sostenibile durante il ciclo di vita).
L'ing. Enrico Maria Pizzarotti (Presidente e Direttore Tecnico di Pro Iter s.r.l.), in collaborazione con gli specialisti in tunnelling e ingegneria geotecnica della Società, ha presentato i due seguenti articoli:
Brenner Base Tunnel, Italian Side, Lot Mules 2-3: monitoring, surveys, investigations and checks during construction
(Authors: E.M. Pizzarotti, M. Rivoltini, M. Moja e S. Bellini di Pro Iter s.r.l.; A. Voza di BBT SE)
ABSTRACT: Lot Mules 2-3 is the main segment of BBT (Brenner Base Tunnel) on Italian Side. The paper illustrates the activities forecasted in Detailed Design (performed by the Designer Joint Venture: Pro Iter – leader, Pöyry Schweiz, Pini Swiss Engineers and Pasquali Rausa Engineering) and carried out during construction, to compare the design assumptions to the actual behavior of both the rock mass and the confining structures, such as monitoring, surveys, investigations and checks. In fact, in a project of such complexity, only the daily update of the monitoring data and the association between them and the undertaken counter-actions during advancement, enable the work to be developed under a continuous and careful risk control.
The S. Caterina road tunnel in Sicily (Italy): intensive use of jet-grouting stabilization
(Authors: E.M. Pizzarotti, M. Rivoltini, G. Ciceri e S. Bellini di Pro Iter s.r.l.)
ABSTRACT: The 900 m long single tube S. Caterina tunnel in Sicily involves mediocre geological materials (yellow sands with calcarenite levels, blue-grey marly clays) and it crosses an area with many existing buildings under low overburden (max. 30 m). Thus, settlement control is one of the main issues to reduce the impact on the surroundings; for this reason, typical sections were defined with mono-fluid jet-grouting columnar treatments on both the cavity boundary and the face front. In Detailed Design phase, a combination of numerical analysis 2D / 3D and analytical methods from literature were used to identify (and consequently, prevent) possible damages to buildings caused by tunnel excavation. Finally, a detailed surface and underground monitoring was designed, in order to verify the correctness of design assumptions.
Gli articoli originali (contenuti negli atti ufficiali del WTC) sono acquistabili direttamente dal sito del WTC 2020.
