A New Method for the Measurement of Gas Pressure in Water-Bearing Coal Seams and Its Application

Table 3

Drilling parameters for pressure boreholes in coal seams.

Borehole parameters	1^# coal seam			2^# coal seam			3^# coal seam
	Drilling depth (m)	24	25	28	32	31	34	28	29	31
Hole sealing length (m)	8	8	8	10	10	10	8	8	8
Drilling diameter (mm)	Φ146/108
Seam inclination (°)	20	20	20	12	12	12	30	30	30
Water flow rate ()	5	30	22	44	62	58	55	51	90

Note: drilling diameter Φ146/108 (coal seam drilling diameter was 146 mm and diameter of pressure measuring hole after sealing was 108 mm).