TRE Altamira is at the Australian Tunnelling Conference 2022
to present InSAR for Tunnelling Operations
Tunnelling and civil engineering groundwork activities are constantly increasing due to urban development. Ground excavation activities, especially in highly urbanized areas, can lead to potential geohazards due to ground settlement associated with tunneling construction operations.
InSAR data is crucial to help assist in determining the extent and origin of ground instability, as well as monitor the surface-level impact of groundwork activities along the alignment and in the surrounding areas.
Satellite data provides useful information on 1) ground movement trends prior to operations; 2) surface movement during tunneling operations - to assess the relationship between groundworks and surface motion; and 3) post-excavation stability - to detect possible residual subsidence that might impact infrastructure.
Spatially dense and precise results
Thanks to its millimetric precision and high density of measurement points, InSAR is also used to complement and calibrate real-time in-situ surveillance such as levelling, inclinometers, etc.
Non-invasive and scalable technique
Completely remote, satellite InSAR is unrivaled in its ability to obtain displacement measurements over large or small areas.
InSAR is the only ground monitoring technique providing highly dense measurements at a fraction of the cost of other survey techniques.
Satellite data archives extend back to 1992 and can be processed to assess past movement trends.