Module Spec 3.0

Seismic Fault Navigation

Encountering unknown geological fault zones presents the highest mechanical and financial risk during subterranean excavation. TBMs are frequently outfitted with advanced seismic prediction systems (TSP - Tunnel Seismic Prediction) to mitigate these friction anomalies before physical contact.

Acoustic Velocity Mapping

By detonating minor explosive charges within the tunnel wall and recording the reflected seismic waves via geophones, geotechnical engineers can map changes in acoustic velocity. Hard, intact rock (high velocity) contrasting sharply with crushed fault gouge (low velocity) yields a 3D structural model up to 150 meters ahead of the cutting face.

Once a fault zone is identified, the machine initiates forward-probing drills directly through the cutterhead, allowing chemical polyurethane grouts to be injected into the fracture network, effectively consolidating the ground prior to excavation.