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The project is twin 12.4 metre tunnels linking the Western Freeway to Kelvin Grove in Brisbane Australia. The project is expected to open to traffic in mid 2015. The project used two 2,800 ton double shielded tunnel boring machines (TBM's) to excavate 4.6 kilometre of rock in a record 10 months.

GEL Instrumentation was engaged to supply, install and monitor the special areas along the tunnel alignment and at the Eastern portal entrance. The TMB's commenced at the Western portal and due to their record excavation cutting rates, put enormous pressure to procurement, install and establish base line data prior to the TBM's passing underneath the special areas.

Monitoring was required due to the shallow cover in some areas. GEL instrumentation installed in-place MEMS inclinometers, vibrating wire extensometers and vibrating wire load cells. All instrumentation was connected to data loggers equipped with radio telemetry and Telstra Next G modems. In conjunction with Vista software, a complete package was commissioned so that site monitoring personnel and TBM operators were in constant contact with the data from the installed instrumentation either via live data on a PC or via SMS alerts.


Kinchant Dam was built in 1977 on Sandy Creek to provide irrigation and town water. It holds 62,800 litres of water at an average depth of 6.8 metres and a surface area of 920 hectares. The dam is located in the picturesque Pioneer valley 41 kilometres west of Mackay in northern Queensland.

GEL Instrumentation was engaged to install additional Geotechnical equipment and to automate the existing geotechnical instrumentation. Installed instrumentation includes vibrating wire piezometers, seepage wire sensors and data loggers with Next G telemetry. Data is uploaded daily using Vista software.