Table 3 Borehole Information.

From: Weakening and fracturing mechanism of roof strength through borehole pressure relief under true triaxial stress

Drilling technique

Parameter information

Drilling depth

11.56 m

Drilling diameter

113 mm

Drilling location

2,300 mm from the ming side

Drilling spacing

0.4–0.5 m

Drilling inclination angle

60°, inclined toward the 131,304/131,306 working face

Construction site

120 m from the 131,304 belt conveyor roadway, 200 m ahead of the working face

Corresponding location in 131,306 track roadway, 200 m ahead of the working face.

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