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Argillaceous rocks increase in volume when they come into contact with water. In tunneling, the rock swelling manifests itself as a heave of the tunnel floor, or - when the heave is costrained - as a pressure on the invert arch. The floor heave in a highway tunnel in Switzerland was monitored over a period of 6 months during various excavation phases. In this paper, the measured time-dependent deformations are interpreted by means of transient numerical simulations. The swelling in the vicinity of the tunnel is modelled as a hydraulic-mechanical coupled process, i.e. the stress re-distribution as well the seepage flow around the tunnel is taken into account. Such an approach makes possible the analysis of time-dependent effects. The governing equations are solved by the finite-element method.
Authors:Anagnostou, Georgios and Kovári, Kalman
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1995