ABSTRACT
Seismic prediction is performed in a 15 km long stretch of the exploratory tunnel of the Brenner Base Tunnel (BBT). The great overburden makes it evident, that the initial geological-geotechnical model has to be updated alongside while heading. Several techniques are performed to do so. The seismic prediction method is sensitive to the elastic material properties of the material the seismic wavelet travels in. The results obtained are 3D seismic models based on compression (P) and shear (S) wave velocity which are jointly interpreted to grade the rock mass quality quality in the light of the ongoing tunnel heading. The seismic measurements are performed with the Tunnel Seismic Prediction (TSP) 303 system from Amberg Technologies (AT). Discussing one geophysical seismic measurement campaign as a case study it will be shown that structural as well as lithological changes affect the seismic image and how these are interpreted.
