Table 3 Specific parameters of directional energy accumulation blasting on the roof of Longtan Coal Mine.

From: An exploration of improving stability of gob-side entry retained with graded and zoned pressure relief technology: a case study

µ

σt/MPa

P/MPa

D

Pb/MPa

rb/mm

re/mm

le/mm

lb/mm

d/mm

0.36

5.0

10.0

0.45

1380

25

20

4.2

6.0

899

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