Table 2 Single group blasting hole parameters.

From: Disaster-causing mechanism and control technology of interlayer rock breakage in gently inclined close distance coal seams mining

Order number

Angle (°)

Drilling length (m)

Charge length (m)

Explosive charge (kg)

Sealing length (m)

Detonator

Lower groove 1#

Northwest direction 45°

35

25

120

10

6

Lower groove 2#

North direction 0°

35

25

120

10

6

Lower groove 3#

Northeast direction 22.5°

35

25

120

10

6

Blasting roadway 1#

Northwest direction 67.5°

35

25

120

10

6

Blasting roadway 2#

Northwest direction 45°

35

25

120

10

6

Blasting roadway 3#

North direction 0°

35

25

120

10

6

Total

210

150

720

60

36

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