Study on Rib Sloughage Prevention Based on Geological Structure Exploration and Deep Borehole Grouting in Front Abutment Zones

Table 3

Parameters of the boreholes.

Borehole member	Borehole location	Borehole depth (m)	Borehole height (m)
1#, 3#, 5#	Upper row	100	0.8 m from the roof
2#, 4#, 6#	Lower row	100	1.8 m from the roof
7#, 9#	Upper row	70	0.8 m from the roof
8#, 10#	Lower row	70	1.8 m from the roof
11#, 13#, 15#, 17#, 19#, 21#	Upper row	60	0.8 m from the roof
12#, 14#, 16#, 18#, 20#, 22#	Lower row	60	1.8 m from the roof