ABSTRACT
The Line 6 of Naples Underground is part of the underground network system. The paper reports aspects of the design and monitoring data during the tunnel construction and demolition inside the San Pasquale Station shaft. The station shaft has a rectangular shape in plan of 85 × 24 m; the maximum excavation depth is about 27 m, and the water table is about 1 m below the ground level. The excavation is supported by large T-section diaphragm walls. The diaphragm walls were installed before the tunnel excavation using an EPB TBM crossed the station area. Two rectangular chambers located on both short sides of the shaft were realized by treating with jet grouting the soil volume confined between specially constructed plane diaphragm panels. During the tunnel construction and the lining demolition, effects on the peripheral diaphragm panels and further on the close buildings were observed and are summarized in the paper.
