The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining

Table 1

Drilling parameters.

Drilling number	Hole position	Drilling diameter (mm)	Drilling depth (m)	Inclination (°)	Included angle with laneway midline (°)
1#	The coal wall at 20m away from the working face	73	120	+27.0	12.0
2#			135	+12.0	35.0