Monitoring sprayed concrete lining deformation during tunnel and shaft construction

Measuring tunnel and shaft lining deformation during Semmering Base Tunnel excavation and construction

The Semmering Base Tunnel is a railway tunnel 27.3 km long. ‘Mega’ civil engineering projects require geotechnical monitoring to validate construction techniques and materials – and reduce the risk of unforeseen events. This is not always easy. Total stations require the presence of survey personnel in the tunnel space during excavation. Steep angles, dust and dirt mean they are not always effective. Distributed fiber optic sensing provides continuous strain monitoring of the tunnel and shaft shotcrete linings during the 8-10 years construction and 150 years operation.

How will you continuously monitor tunnel or shaft linings during construction and operation?

Let us help you decide how this technology will provide the data you need to reduce risk during excavation and provide data for condition monitoring. Contact us and share your thoughts.

Read the Case Study here- PDF

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  • Sensor integration into tunnel lining
  • Tunnel and shaft deformation monitoring during excavation and operation
  • Shape sensing of tunnel lining – providing data to compare model with actual
  • Temperature monitoring of concrete curing
  • Confirmation of construction materials and practices
  • Comparison with conventional geodetic instruments (fiber Bragg gratings, vibrating wire (VWS), and total station) measurements.

Watch the video (select English subtitles in settings):

External links to technical papers:

Reinforced Earth Structures at Semmering Base Tunnel – Construction and Monitoring using Fiber Optic Strain Measurements’
W. Lienhart &F. Moser Institute of Engineering and Geodesy and Measurement Systems (EGMS), TU Graz, Austria
H. Schuller INSITU Geotechnik ZT GmbH, Graz
T. Schachinger OBB-Infrastructur AG, Vienna, Austria

Christoph M. Monsberger · Werner Lienhart
Distributed fiber optic shape sensing along shotcrete tunnel linings: Methodology, field applications, and monitoring results – Journal of Civil Structural Health Monitoring

Lienhart W, Buchmayer F, Klug F and Monsberger CM
Distributed fibre-optic sensing applications at the Semmering Base Tunnel, Austria. Proceedings of the Institution of Civil Engineers – Smart Infrastructure and Construction

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