Tunnelling | InSAR surveillance | Subsidence Claims

Gran Paris map

The Grand Paris express, with 200 km of underground metro lines, is the largest tunneling project worldwide to use InSAR for monitoring the surface impact of this extraordinary urban development project.

  • 68 new stations
  • 200 km of underground metro lines
Grand Paris express InSAR surveillance
Grand Paris Express. InSAR surveillance has been deployed over the 200 km-metro line during all stages of the project: baseline before work began back to 1992 (in the image above), monthly updates during the work and post-construction monitoring.

We have been providing InSAR surveillance at all stages of the tunnelling project:

  • Historical analysis to complement existing geotechnical information and to settle subsidence claims
  • Monitoring during works to assess the magnitude of surface motion and its real distribution
  • Post-construction monitoring to scale back in-situ measurements

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