Research on Control of Rib Spalling Disaster in the Three-Soft Coal Seam

Table 3

Two grouting time and position of working face.

Grouting time

2019-09-06

Total

2019-09-09

Total

Grouting position/# support

25#

29#

31#

33#

35#

5 holes

34#

37#

40#

3 holes

Grouting volume/barrel

46

28

40

40

30

Totaling 5.1 tons

60

30

60

Totaling 4.2 tons