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Home » Case study » Onnens Motorway A5

Onnens Motorway A5

Published on January 30 2017

The cross-section of the tunnel consists of two concrete vaults. The length of the tunnel is 1230 m.

Image Onnens Motorway A5

The aim of the monitoring was to increase knowledge on the vaults behaviour during the outer filling loads application. 30 sensors were installed on one characteristic section. Fiber optic sensors are integrated in the global concept together with inclinometers, thermometers, load cells, piezometer cells and geometric measurement. 

INSTALLATION PERIOD TYPE OF SENSORS NUMBER OF SENSORS
2000 – 2003 SOFO 6

Aim of monitoring:
Behaviour and stabilization of the cut and cover tunnel has been verified at each phases of the filling.

Image

Global view

Image

Fiber optic sensor and inclinometer in the central section

Image

Connection box integrated in the framework

Image

Final connection box after the removal of the framework on a technical gallery

Related Applications

Tunnel

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Developer and Manufacturer of Geotechnical & Structural Instruments and Soil/Rock Testing Equipment

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Provider of innovative Fiber Optic Solutions for Structural Health Monitoring and Geotechnical Instrumentation

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Provider of Geotechnical & Structural Instruments
since 1947

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Provider of Hydrogeological & Geotechnical Services. Investigations, Monitoring & Testing

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Developer & Manufacturer of Fiber Optic Sensors
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