Abstract
The part dealing with the research contains a summary of effects of most important factors influencing results of simulations of NATM tunnels; nonlinearity of stiffness and high initial stiffness of the material, anisotropy and the value of the coefficient of earth pressure at rest K0. The practical part of the paper compares predictions for the Královo Pole tunnels using two different constitutive models: the standard Mohr-Coulomb model and an advanced nonlinear hypoplastic constitutive model.
The analysis was carried out in the following steps:(1) calibration of constitutive models to the data obtained from laboratory experiments on the Brno Clay; (2) simulation of the exploratory gallery behaviour; (3) optimisation of the set of parameters by means of a back analysis of the exploratory adit with the aim of eliminating the scale effect, which enters the process of the constitutive models calibration; (4) predictions of the behaviour of the tunnel using optimised parameters.