P015 A New Approach for Detection of the Geological Features Ahead of the Tunnel During Excavation Abstract 1 During the construction of the tunnel the knowledge about the geological and geotechnical features is very important. The civil Engineer must adapt the construction method and resources to the geological conditions. This guarantees the safety and low costs during tunnelling. Seismic is the most suitable method to detect the soil and rock mass conditions ahead of the tunnel excavation. Because seismic parameters and responses correlate directly to geological and geotechnical features. The new 3D Seismic Survey in the Tunnel (3D-SST) allows to


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