Research on the Deformation and Control Technology of Surrounding Rock in Entry Retaining along the Gob Side

Table 8

Design parameters of boreholes for detection.

NO	1^#	2^#	3^#	3^#	4^#	5^#	5’^#
Diameter (mm)	33∼34	33∼34	33∼34	33∼34	33∼34	33∼34	33∼34
Azimuth, α (°)	–90	90	—	—	90	—	—
Dip angle, β (°)	0	0	90	90	0	90	90
Length (m)	10	10	10	10	10	10	10

No, 1 # boreholes failed in the middle of drilling, which were abandoned and excluded.