Longitudinal Displacement Profiles for Convergence-Confinement Analysis of Excavations: Applicability to Tunnelling, Limitations and Current Advancement

Nicholas Vlachopoulos, Ya Su

Dans les comptes rendus d’articles de la conférence: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Rock Mechanics

ABSTRACT: Convergence-confinement method of analysis for tunnelling is a typical approach used in industry for the preliminary analysis of anticipated ground behaviour due to the excavation of a tunnel. This methodology yields an estimate of the load imposed on the support immediately behind the newly excavated tunnel face. Upon excavation, the area immediately behind the face is partially supported by the face itself and does not carry the full load of an open cavity at that moment. Since the inception of this analytical technique, there have been many investigations into the improvement of the Longitudinal Displacement Profile (LDP) in order to address its limitations. The focus of this paper is to describe the technique, guide potential users as to how to apply such an analytical method, to describe the current limitations and how they may be overcome or further investigated.

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