GT-20 Tunnel addresses tunnel construction safety needs. By emitting a pulsed magnetic field through a small loop and receiving the secondary-field signal, it performs high-sensitivity detection of low-resistivity anomalies ahead of the face, such as water-bearing structures, fracture zones, and karst caves. The equipment is lightweight and flexible with a small detection blind zone, and can be rapidly and densely deployed at the face, providing a real-time geological early-warning basis for tunnel excavation.
Advance detection in full-space environments such as tunnels, roadways, shafts, and adits (distance up to 150 m); prediction of water-bearing faults, fissure water, karst, and karst caves ahead of and around the face; detection of inrush-water sources and water-bearing structures ahead of excavation faces in non-coal mines; detection of roof and floor water-conducting fracture zones caused by mining disturbance; detection of the strike of underground vein-type orebodies in metal mines; detection of water-bearing structures and underground metal pipelines around underground chambers; detection of water-bearing structures and faults within 150 m depth underground.
| GT-20 |
High-power solution with small coils in tunnels: trading current for signal-to-noise ratio, pulling out the weak anomalies ahead of the face.
Advance detection for tunnels, roadways, shafts, and adits; water-bearing faults, fissure water, karst, and karst caves within 150 m ahead of and around the face.
Construction can still proceed with large iron objects, supports, and drilling rigs not removed, and under conditions of standing water or inrush water requiring pumping.
Geophysical data is submitted within half a working day after fieldwork ends; combined with geological conditions it predicts water-rich zones and guides borehole verification.
| Parameter Name | GT-20 |
|---|---|
| A/D Converter | 32Bit |
| Dynamic Range | 160dB |
| Sampling Rate | 1μs、4μs、16μs、 |
| Background Noise | 1μV |
| Storage | 120GB electronic disk (expandable) |
| Display | 10.4-inch TFT LCD |
| Max Transmit Current | ≥150A |
| Current Emission Frequency | 25Hz、12.5 Hz、6.25 Hz、3.125 Hz、1.5625 Hz |
| Turn-off Time | 0.5-300μs |
| Transmit Waveform | Bipolar rectangular wave |
| Stacking Times | 200 |
| Dimensions | 403mm×330mm×178mm (L×W×H) |
| Weight | 8KG |
| Operating Temperature | -10℃-50℃ |
