Abstract
The paper demonstrates the practical application of an advanced hypoplastic model in class A predictions of a NATM tunnel in fine-grained soils and urban environment. The tunnel is excavated in stiff clay with 21 meters of overburden thickness.
The constitutive model was calibrated using laboratory data and the chosen material parameters were optimised using geotechnical monitoring data from an exploratory drift. Based on the optimised data set, the future tunnel was simulated.
After the tunnel excavation, it could be concluded that the model predicted correctly surface settlements, surface horizontal displacements, and the distribution of vertical displacements with depth. It overpredicted horizontal displacements in the vicinity of the tunnel.