A New Width Measurement Method of the Stress Relief Zone on Roadway Surrounding Rocks

Table 3

Gas extraction parameters under different sealing depths.

1# borehole (sealing depth of 8 m)			2# borehole (sealing depth of 9 m)			3# borehole (sealing depth of 10 m)			4# borehole (sealing depth of 11 m)			5# borehole (sealing depth of 12 m)			6# borehole (sealing depth of 13 m)
Day (number)	PFR (m^3/min)	(%)	Day (number)	PFR (m^3/min)	(%)	Day (number)	PFR (m^3/min)	(%)	Day (number)	PFR (m^3/min)	(%)	Day (number)	PFR (m^3/min)	(%)	Day (number)	PFR (m^3/min)	(%)
1	0.028	25.4	1	0.059	40.9	1	0.021	12.1	1	0.046	28.4	1	0.018	12.3	1	0.014	18.6
2	0.052	13.8	2	0.075	14.3	2	0.063	51.4	2	0.057	45.8	2	0.094	44.8	2	0.115	57.9
3	0.045	50.5	3	0.053	15.1	3	0.024	11.7	3	0.029	17.5	3	0.047	30.5	3	0.081	29.3
4	0.017	12.8	4	0.051	14.3	4	0.039	14.5	4	0.025	17.5	4	0.090	41.8	4	0.065	50.2
5	0.042	17.2	5	0.036	17.4	5	0.045	16.4	5	0.044	18.7	5	0.077	50.3	5	0.062	52.5
6	0.024	9.3	6	0.017	11.2	6	0.064	52.6	6	0.051	60.9	6	0.037	42.8	6	0.027	37.3
7	0.046	21.5	7	0.013	19.8	7	0.045	20.7	7	0.059	67.1	7	0.084	50.0	7	0.078	47.3
8	0.066	17.3	8	0.034	22.1	8	0.033	20.9	8	0.048	56.4	8	0.042	49.5	8	0.052	34.3
Average	0.040	20.98	Average	0.042	19.39	Average	0.042	25.04	Average	0.045	39.04	Average	0.061	40.30	Average	0.062	40.90

PFR: pure flow rate; C: concentration.