Project Update - Forrestfield Airport Link

The Forrestfield-Airport Link (FAL) project will deliver an 8.5 km extension of the existing PTA urban rail network in Perth, Western Australia connecting the Midland Line, just past Bayswater Station, to Forrestfield, running underground in twin bored tunnels underneath the Swan River, Tonkin Highway and Perth Airport. The project will include three new stations, being: Redcliffe Station (located underground in Redcliffe), Airport Central Station (located underground at Perth Airport to service both domestic and international terminals) and Forrestfield Station.

The project will provide new rail services allowing a 20-minute rail journey from Forrestfield Station to the Perth CBD, improved bus networks for the eastern suburbs, foothills and surrounding communities as well as integration with the full Transperth bus and train network.

Redcliffe Station and Forrestfield Station will have rail-bus interchanges and up to 2,500 new car parking bays in total.

Description of Geomotion Works

Salini Impregilo S.p.A. - NRW Pty Ltd Joint Venture (SI- NRW JV) has entered into an agreement with Field Monitoring Services, Geomotion Australia, Land Surveys Joint Venture (FGLS JV) for the work of:

“SUPPLY, INSTALLATION, TESTING, OPERATION, MAINTENANCE OF GEOTECHNICAL AND SURVEY INSTRUMENTATION, INCLUSIVE OF MONITORING AND MIMS MANAGEMENT FOR FORRESTFIELD AIRPORT LINK PROJECT”.

​Geomotion is working as a part of Joint Venture partner and broadly responsible for the followings works:

• Drilling (through subcontractor) & Installations, maintenance and monitoring of Geotechnical Instruments as per Project Instrumentation and Monitoring Plan (IMP). The monitoring system incorporates installation of Inclinometer tubing with spider magnets/ magnetic ring for DEX system including in-place inclinometers, single and multipoint rod extensometers & displacement transducer, Heave Stake, Piezometers (Vibrating wire, vented pressure transducer with conventional sand filter), Strain Gauges (surface, tunnel segment & strut), Strut Load Cells, Biaxial Tilt meter, Electro level Beam, Vibrometer and Structure Monitoring Prism inside tunnel for convergence monitoring.
• Installation of Dataloggers (miniOmnialog, Omnialog, Loadsensing, Syscom) with telemetry for automation for instruments required near real time measurements.
• Set up & Maintenance of Web based Monitoring Information & Management System (MIMS) using Maxwell Geosystems Mission OS construction data management package. All sensors are either connected to data logging system and is linked to MIMS with telemetry or manual survey data processed & uploaded on MIMS. The software allows direct comparison between monitored and designed behavior including automated reporting.

Instrument	Qty	Instrument	Qty
​In-Place Inclinometer (Including DEX-S)	39	​Diaphragm Wall Inclinometer Tubing	518m
​Single Point Rod Extensometer with Displacement Sensors	38	​Soil Inclinometer Tubing	958m
Multi Point Rod Extensometer with Displacement Sensors	34	​Vibrating Wire Piezometer	73
​Biaxial Tilt Meters	9	​Vented Pressure Transduce	5
​Strain Gauges (Surface)	8	​Electro level Beam	2
​Strain Gauges (Tunnel Segment)	288	​Heave Stake	2
Strain Gauges (Spot Weldable- Strut)	15	​Vibrometer	9
​Load Cell (Strut)	7	​Structure Monitoring Prism (Tunnel)	114