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  Radar interferometry as an innovative solution for monitoring the construction of the Grand Paris Express metro network – First results

  The Grand Paris Express (GPE) is an unprecedented urban development project centred on a major expansion of the existing public transport network for the whole Paris metropolitan area. Overall, 68 new stations and 200 km of metro lines will be gradually put into service. Among numerous aspects, the project is driven by risk management and neighbourhood disturbance reduction. These considerations play a key role in the design and the construction process and monitoring is a major part of the contractors’ missions. Among the monitoring methods implemented in the framework of the project, there is an innovative technology, Synthetic Aperture Radar Interferometry or InSAR. This technique, deployed over the 200 km of metro line during the construction, is based on the use of SqueeSAR™, a processing chain and proprietary multi-interferogram technique developed and patented by TRE ALTAMIRA. Grand Paris Express, SAR Interferometry, satellite, monitoring, Line 15 South. Grand Paris Express is arguably the largest transport project in Europe. It consists of a fundamental rethink and redesign of the public transport network for the entire Paris metropolitan area. With 68 new stations and 200 kilometres of additional tracks, the Grand Paris Express network includes of a ring route around Paris (Line 15) and lines connecting developing neighbourhoods (Lines 16, 17 and 18). The routes of the project are shown the plan also involves the extension of existing metro lines. Construction work began mid-June 2016 and is intended to last almost until 2030. As a development project on the scale of the whole metropolis, GPE involves the creation of numerous construction sites. Most of the work is carried out in dense urban areas and is based on the use of complex underground drilling techniques. Among numerous aspects, the project is driven by risk management and mitigation; and those aspects play a key role in the design and the construction process. The Société du Grand Paris (SGP) is the public agency set up by the French government in 2010 to deliver the vision of Grand Paris Express. It leads operations related to the construction of the new lines, stations, structures and facilities, acquisition of rolling stock for the infrastructure and development within and around the stations. From project conception to the execution of the Grand Paris Express, the SGP relies on specialized companies that support it in its role of project owner. In particular TRE ALTAMIRA was commissioned by the Société du Grand Paris to monitor the impact of the civil engineering operations along its track and the adjacent areas.

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