Designing of tunnels directly depends on the interactions of rock masses with engineering structures, which are examined in the paper. The essential issue is extrapolation of the parameter from the testing zone to the whole volume that is of interest for analyzing interactionsin the system rock mass-structure. The paper exposes Empirical-Statical-Dynamical (ESD) methodology of extrapolation. That methodology is based on a combination of geotechnical and geophysical testingand rock mass classification, connected with definition of adequate regressive models.