Study on Pressure Relief Technology of High-Pressure Water Jet of Residual Coal Pillar in Overlying Goaf in Close Seam Mining

Table 4

Statistics of single-drilling coal output.

Borehole name	Single cutting time (min)	Single coal output (t)	Number of slits (time)	Total slotting time (min)	Total coal output (t)
C-1	5	0.60	2	10	1.20
C-2	5	0.51	2	10	1.02
C-3	5	0.57	3	15	1.71
C-4	5	0.60	2	10	1.22
C-5	5	0.53	2	10	1.06
C-6	5	0.57	3	15	1.71
M-1	5	0.51	2	10	1.02
M-2	5	0.60	2	10	1.20
M-3	5	0.60	3	15	1.80
M-4	5	0.57	2	10	1.14
M-5	5	0.60	2	10	1.20
M-6	5	0.53	3	15	1.59