Study on the Interaction between Low-Viscosity High-Permeability Pregrouting Sealing Material and Coal and Its Application

Table 7

Technical parameters of pressure-measuring boreholes.

	No.	Location	Elevation (m)	Buried depth (m)	Dip (°)	Actual hole length (m)	Measured pressure (MPa)
Comparative group 1	1#	1,471 m from no. 3108 return roadway	636	463	2	55.2	0.39
	2#	1,491 m from no. 3108 return roadway	636	463	2	55.7	0.38
Comparative group 2	3#	1,223 m from no. 3108 return roadway	627	472	2	53.7	0.41
	4#	1,203 m from no. 3108 working face	628	471	2	53.6	0.41
Comparative group 3	5#	1,100 m from no. 3412 return roadway	594	505	2	55.8	0.52
	6#	1,125 m from no. 3412 return roadway	596	503	2	55.4	0.50
Comparative group 4	7#	290 m from no. 3412 return roadway	579	520	2	53.2	0.67
	8#	310 m from no. 3412 return roadway	576	523	1	53.3	—