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When tunneling through swelling rock, relevant deformations occur only in the tunnel floor. This phenomenon is here numerically modelled as a coupled hydraulic-mechanical process. The observed absence of swelling deformations at the tunnel walls and the crown can be explained as a consequence of varying hydraulic boundary conditions along the excavation boundary. The paper focuses on the importance of unsaturated seepage flow. According to the numerical results, the nonlinearity of the unsaturated flow equation has a decisive qualitative influence on the predicted deformation field.
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1995