Proceeding of the 2018 DFI-EFFC International Conference on Deep Foundations and Ground Improvement, Rome, Italy, (DFI, EFFC)
Ventilation Shafts and Drifts for the Metro Line 6 Project in Naples, Italy
Vittorio Manassero, Giorgio Mormone and Federico Moccia
The paper deals with the application of construction methods which have a low impact on the surrounding buildings and utilities, while geotechnical and underground works are being carried out. At Metro Line 6 in Naples the ventilation system entails underground chambers connected to the TBM tunnel by a vertical shaft and a horizontal drift. The shafts are constructed adopting a technologically innovative solution, the VSM (Vertical Shaft-sinking Machine) construction method. This mechanized system, as well as enabling a faster and safer excavation compared with conventional techniques, allows the whole construction to be completed without operators having to descend into the shaft and without lowering the surrounding water-table. This means a considerable increase in safety for operators and a significant reduction in the effects on the surrounding environment, particularly relevant when operating in urban areas. For the connection drifts a preliminary soil or rock improvement was designed according to the soil to be bored: penetration grouting in rock and jet grouting in loose soil. Monitoring of the effects on the surrounding buildings and utilities is in service before, during and after the site activities. The monitoring is confirming the low impact of the construction method adopted, settlements and disturbance by vibration resulting as negligible.
|article #2992; publication #1040 (ROME-2018)|