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G. Lunardi - NHAZCA Open Day

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This document summarizes a presentation given by Giuseppe Lunardi on the Rome Metro B1 project. Some of the key challenges of the project included excavating in soft ground with a high water level and interference with existing buildings. Innovative solutions used included special jet grouting and diaphragm walls for the stations. Monitoring systems were also implemented during the jet grouting process to measure deformation and send alerts if thresholds were exceeded.

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NHAZCA OPEN DAY ROMA 31 – 01 – 2013 Roma MetroB1: problems and solutions for a deep underground excavation in urban context in soft ground and with high water level G. Lunardi Rocksoil s.p.a Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI
METRO B1 DESIGN FEATURES: Excavation in ground with low geotechnical properties; Deep excavation with high water level; Heavy interference with buildings; GEOTECHNICAL ASPECTS • Hexcavation = 40 m • HW= 35 m Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI
INNOVATIVE SOLUTIONS: Special jet grouting and Hydromill Diaphragm walls (stations); H jet= 12 m Diaphragm •Pressione miscela 400 - 420 bar •Portata miscela 325 - 345 l/min wall •Pressione aria 6 -10 bar Deflection for •Portata aria 6500 – 8000 l/min •Densità miscela 1,51 kg/dm3 jet grouting •Velocità di rotazione 3 – 5 giri/min •Velocità di risalita 18 – 22 cm/min Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI
Monitoring systems adopted during the jet grouting phase Monitoring Sh=101 mm instrumentation in Gondar Station CONTROL OF JET- GROUTING PARAMETERS L’acquisizione ravvicinata del dato, la trasmissione in tempi brevissimi e la procedura di allarme tramite sms preimpostati, se si fosse superata una determinata soglia di deformazione, hanno permesso di portare a termine le lavorazioni monitorate senza ulteriori movimenti. Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI

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G. Lunardi - NHAZCA Open Day

  • 1. NHAZCA OPEN DAY ROMA 31 – 01 – 2013 Roma MetroB1: problems and solutions for a deep underground excavation in urban context in soft ground and with high water level G. Lunardi Rocksoil s.p.a Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI
  • 2. METRO B1 DESIGN FEATURES: Excavation in ground with low geotechnical properties; Deep excavation with high water level; Heavy interference with buildings; GEOTECHNICAL ASPECTS • Hexcavation = 40 m • HW= 35 m Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI
  • 3. INNOVATIVE SOLUTIONS: Special jet grouting and Hydromill Diaphragm walls (stations); H jet= 12 m Diaphragm •Pressione miscela 400 - 420 bar •Portata miscela 325 - 345 l/min wall •Pressione aria 6 -10 bar Deflection for •Portata aria 6500 – 8000 l/min •Densità miscela 1,51 kg/dm3 jet grouting •Velocità di rotazione 3 – 5 giri/min •Velocità di risalita 18 – 22 cm/min Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI
  • 4. Monitoring systems adopted during the jet grouting phase Monitoring Sh=101 mm instrumentation in Gondar Station CONTROL OF JET- GROUTING PARAMETERS L’acquisizione ravvicinata del dato, la trasmissione in tempi brevissimi e la procedura di allarme tramite sms preimpostati, se si fosse superata una determinata soglia di deformazione, hanno permesso di portare a termine le lavorazioni monitorate senza ulteriori movimenti. Roma 31 – 01 – 2013 NHAZCA OPEN DAY GIUSEPPE LUNARDI