Abstract:

Seismic reflection wave is widely used in advance geology prediction in tunneling. Due to the restrictions of construction schedule, geological condition, site cooperation and operators level, however, a lot of data acquired in TGP geology prediction are abnormal. In the paper, the causes for the abnormal data are analyzed in terms of triggering and charging, voltage (current) interference, coupling, tunnel tube wave and lithology changing, and countermeasures, including 1) improving the charging quality; 2) keeping TGP prediction far from high voltage cables and equipment; 3) ensuring the borehole quality; 4) doing a good job in water injection and hole plugging; 5) paying more attention to the basic geological works, are proposed.

Key words: tunnel, advance geology prediction, TGP seismic wave prediction technology, abnormal data