Table 1 Basic parameters of in-situ stress measuring points in No.9 coal seam of Limin coal mine.
Measuring point | Measuring point position | Depth of embedment/m | Drilling depth/m | Borehole orientation/° | Dip angle of hole/° | Probe installation angle/° |
|---|---|---|---|---|---|---|
No.1 | No.1 hole of gentle slope inclined shaft 3700 m | 296 | 8.75 | NE185° | 3 | 5 |
No.2 | No.2 hole of gentle slope inclined shaft 3700 m | 296 | 9.31 | NE275° | 3 | 0 |
No.3 | Horizontal ring yard of No.9 coal seam | 324 | 9.82 | NE175° | 4 | 4 |
