Application of seismic tomography in investigations of the motorway alignment in the Sentvid tunnel area

摘要

The motorway tunnel Sentvid construction area has a very demanding geotechnical structure. On the basis of previous investigations, it was not possible to exactly define the best locations of merging caverns with ramp tunnels. That is why initially an exploration gallery has been constructed, in which different geological, geomechanical and geophysical investigations have been carried out. The goal of geophysical investigations was to obtain seismic parameters to define geomechanical rock mass characteristics in the region of planned merging caverns. Final solution is the velocity field of longitudinal and transversal seismic waves in the investigated region. Dynamic elastic moduli distribution of rock mass was also computed from seismic parameters. Seismic velocity fields and the distribution of dynamic elastic moduli well define areas of more compact rock mass.