Post on 16-Jul-2015
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