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  Non-Linear Motion Detection using SAR Images in Urban Tunnelling

  The InSAR (Interferometric Synthetic Aperture Radar) technology is used around the world for mapping ground deformation. This technology is used for a wide range of projects in Civil Engineering, particularly for tunnelling projects in order to monitor infrastructures during the different phases, including planning, dewatering, tunnelling, construction of facilities like shafts, settlement and maintenance. This paper describes a new methodology for detecting non-linear motion along the tunnelling path. This new approach is an effective methodology for monitoring the impact of the progression of the tunnel boring machine in terms of ground motion, with non-linear movement. With this InSAR specific approach, the evolution of non-linear motion can be perfectly monitored in space and time in urban areas. In addition to the impact of the tunnel boring machine, this technique is very useful for monitoring the impact of dewatering activities previous to tunnelling and the effect in terms of non-linear ground motion of the recharge of the aquifer once the dewatering phase has stopped. Those dewatering activities may affect a large area that cannot be wholly covered by in-situ Instrumentation.

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