Monitoring of urban excavations and underground construction: good practice and recent innovations

Loic GALISSON

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: INFRASTRUCTURE - VI Pipelines & Tunnels

ABSTRACT: Urban excavations and underground constructions generally induce movements of the ground and deformations of the surrounding structures. There are multitudes of means and methods to monitor those collateral effects, the final goal being to optimize the construction process whilst mitigating the construction risk. This paper gives a brief overview of a representative monitoring program, including all steps from the design, through the operations, down to the role of the task force exploiting the monitoring information. Although the value of the monitoring scope is now recognized for such projects, there are still a lot of education required to optimize the specifications, as well as the way the monitoring information is used for the benefit of the project. The author highlights key specifications which enhance the intrinsic value of a monitoring program, technically but also in terms of cost-efficiency. There is a special focus on recent technological innovations in the industry and good practices experienced in current iconic projects. The presentation will be illustrated by examples taken from the Alaskan Way Tunnel in Seattle, WA.

RÉSUMÉ: Dans une grande majorité, les travaux souterrains entrainent des mouvements du sol et des déformations des structures envprocessus de construction tout en limitant le risque inhérent aux travaux. Ce manuscrit décrit les phases successives et les différents intervenants dans la mise en milieu de la construction. liorer non seulement les spécifications techniques requises, mais aussi la façon dutiliser techniques mais aussi financiers. Une attention particulière est apportée aux innovations technologiques récentes dans « Alaskan Way Viaduct » à Seattle, WA.

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