Table 2 Rock structure characteristic parameters and evolution process.
From: Monitoring method for borehole images of changes in overlying rock structure during coal mining
T1 | T2 | Evolution process tracking (T1-T2) | T3 | Evolution process tracking (T2-T3) | |
|---|---|---|---|---|---|
Depth | 229.408 m | 229.451 m | ↓ | 229.415 m | ↑ |
Orientation | N40.6°E∠3.5° | S70°E∠3.6° | ↑ | S70°E∠3.6° | - |
Thickness | 16.1 mm | 10.2 mm | ↓ | 17.8 mm | ↑ |
Three state expression | N/A | N/A | ↓,↓,\(\cap\) | N/A | ↑,↑,- |
