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MILAN M1 SUBWAY: EXTENSION TO CINISELLO MONZA

… subway extension in a difficult geotechnical and hydrogeological context …

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The extension of the line 1 of the Milan Subway to the N-E outskirts of city involved the execution of 4 bored tunnels for a global length nearly 2 km in difficult geotechnical and hydrogeological context. The tunnels are built using conventional tunneling systems with a partial-face excavation.

The work was found to be extremely complex for the presence of incoherent soil (sand and gravel) in an extremely variable hydrogeological context with water table level suddenly changing of some meters in a few months. The presence of some important road infrastructures (A4 motorway Milan-Turin) and several existing buildings next to the excavations, completed the project framework.

To overcome these critical issues a Detailed Design based on the Observational Method was developed. It allowed to finish the excavation works on time with no interruptions and to include in the design possible "most unfavourable" groundwater conditions.

It allowed to absorb the hydrogeological uncertainties and to rationalize the quantities and the dimensioning of the ground improvement treatments with a significant economical optimization of the works cost.

Andrea Antiga, as Soil’s Technical Director, signed the “detailed design” and the “detailed design for construction” for the completion works. He was also responsible for assistance during construction.

Pietro Coppola, as Soil’s Project Manager, was in charge for the main geotechnical and structural designs and numerical analyses.

OWNER

MM S.p.A. - Milan’s Municipality

LOCATION

NORTHERN ITALY

YEAR

2017 - 2020

CLIENT

Andrea Antiga worked as Technical Director at Soil S.r.l.

(DE SANCTIS COSTRUZIONI S.p.A. was Soil’s Client)

PROJECT VALUE

21 Mio EUR (signed detailed design)
90 Mio EUR (whole works amount)

TYPE OF WORK

Tunnel, underground station, special geotechnical works, jet-grouting, injections, monitoring

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