Table 3 Working face conductor height observation drilling elements table.
From: Study of the mining and aquifer interactions in complex geological conditions and its management
Observation borehole | Dip angle | Length (m) | Aperture (mm) | Usage |
|---|---|---|---|---|
1 | 40° | 85 | Φ94 | Observation of height of the water-flowing fractured zone |
2 | 45° | 80 | Φ94 | Observation of height of the water-flowing fractured zone |
