CASE HISTORY

tunnels Line 5

Project Summary Name: Line 5

Date: 2011-2016Project Details Client: Metrorex Contractors: Astaldi-FCC-Delta ACM-AB Construct, Max Bogl Instrumentation Specialist: SOLDATA Consultant: Metroul–Systra

Overview Monitoring Products used

Bucharest has four metro lines (Metro Monitoring the station works as well as Geo-XB Lines 1, 2, 3 and 4) consisting of 70km the Tunnel Boring Machine (TBM) was ~ Borehole Rod Extensometer of double track, 49 stations and four done by numerous automated total complete with VW Displacement depots. The network handles about stations and geotechnical sensors. Transducer and Packer Anchor to 600,000 passengers per weekday and measure settlement, displacement Several hundred boreholes were and deformation. the modernisation project is jointly constructed to monitor ground water funded by the European Investment VW strain gauges level (piezometers), horizontal Bank (EIB) and the Romanian ~ Used to measure strain. Both (inclinometers) and vertical ground Surface Mount & Embedment. Government. deformations (extensometers). Borehole MEMS portable inclinometer Bucharest Metro Line 5 is part of the rod extensometers were installed in ~ To measure lateral displacement. latest phase IV upgrade and extension sections along the (TBM) route to Inclinometer casing of the existing metro network being measure settlement after its passing. ~ For use with portable inclinometers. constructed by Societatea Comerciala VW piezometers Automatic vibrating wire extensometers de Transport cu Metroul (Metrorex), a ~ Measurement of pore water pressure. were used close to station diaphragm metro operating company in Romania. walls. Manual extensometers were used The 17.7km-long underground metro in the tunnels between the stations. will operate from in the south-west zone of Bucharest to The GEO-XB Combi extensometer was Pantelimon in the eastern side through chosen as it provides automatic twin track tunnels. It is being monitoring but also has backup manual constructed in two sections and the readings in case of sensor failure and contract for Section 1 (known as Raul has a low profile enabling it to be Doamnei-Eroilor) started in the second installed fully or semi recessed. Manual quarter of 2011 and is expected to last extensometers were installed in the for about 25 months under the tunnel route between stations. supervision of Metroul – Systra. Due to the soft nature of the ground, the Section 1 involves construction of two GEO-XB Packer Anchor type was underground parallel tunnels each of chosen. It consists of a thin-walled steel 5.7m-diameter and 7km-long. A third pipe 600mm long with an internal grout tunnel measuring 260m-long will be port and a geotextile filter sleeve. By excavated to link Metro Lines 1 and 5 at injecting cement grout into the annulus Eroilor station. A total of 240,000m³ of of the tube and the geotextile the sleeve earth and rock will be excavated to is expanded and once set locks directly construct the tunnels. into the borehole wall.

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