GIUSEPPE LUNARDINHAZCA OPEN DAYRoma 31 – 01 – 2013

NHAZCA OPEN DAY

Roma MetroB1: problems and solutions for a deep underground excavation in urban context

in soft ground and with high water level

ROMA31 – 01 – 2013

G. LunardiRocksoil s.p.a

GIUSEPPE LUNARDINHAZCA OPEN DAYRoma 31 – 01 – 2013

METRO B1 DESIGN FEATURES:

Excavation in ground with low geotechnical properties;

Deep excavation with high water level;

Heavy interference with buildings;

• Hexcavation = 40 m

• HW= 35 m

GEOTECHNICAL ASPECTS

GIUSEPPE LUNARDINHAZCA OPEN DAYRoma 31 – 01 – 2013

INNOVATIVE SOLUTIONS:

Special jet grouting and Hydromill Diaphragm walls (stations);

Diaphragm wall

Deflection for jet grouting

•Pressione miscela 400 - 420 bar•Portata miscela 325 - 345 l/min•Pressione aria 6 -10 bar•Portata aria 6500 – 8000 l/min•Densità miscela 1,51 kg/dm3•Velocità di rotazione 3 – 5 giri/min•Velocità di risalita 18 – 22 cm/min

H jet= 12 m

GIUSEPPE LUNARDINHAZCA OPEN DAYRoma 31 – 01 – 2013

Monitoring systems adopted during the jet grouting phase

CONTROL OF JET-GROUTING PARAMETERS

Monitoring instrumentation in Gondar Station

L’acquisizione ravvicinata del dato, la trasmissione intempi brevissimi e la procedura di allarme tramite smspreimpostati, se si fosse superata una determinata sogliadi deformazione, hanno permesso di portare a termine lelavorazioni monitorate senza ulteriori movimenti.

Sh=101 mm