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SIGNATURE OF TUNNELLING-INDUCED GROUND DEFORMATION IN URBAN AREAS REVEALED BY TIME SERIES ANALYSIS (2014)
We present two examples of ground deformation characterization in the metropolitan area of Vancouver using advanced InSAR. The first regards the construction of the Canada Line, an LRT system connecting Vancouver’s International Airport to the downtown core comprising underground, at-grade and elevated sections and built prior to the 2010 Winter Olympics. InSAR was used to detect surface deformation along the entire alignment prior to and during construction. A clear signature was identified in the deformation data which corresponded well with the timing of tunnel excavation. A second case study regards monitoring of surface deformation associated with the excavation of two tunnels connecting the Capilano Reservoir to the Seymour filtration plant in North Vancouver. The multi-temporal SqueeSAR data processing algorithm was used to characterize the extent and timing of the surface deformation. The results indicate that a large urban area was affected by up to ~ 40 mm of deformation and that approximately 78% of the measurement points recorded an initial acceleration in 2006, corresponding to the start of excavation. Ground movement continued towards the west in step with tunnel excavation.
Vancouver TAC 2014: Tunnelling in a Resource Driven World
TRE Canada Inc, Vancouver, BC, Canada