Permeability Enhancement and Gas Drainage Effect in Deep High Gassy Coal Seams via Long-Distance Pressure Relief Mining: A Case Study

Table 5

Parameters of swelling deformation in the 11224 bottom drainage roadway.

Borehole	Borehole diameter (mm)	Position	Elevation angle (°)	Borehole depth (m)
1#	75	Roadway wall	70	29.5
2#	75	Roadway wall	70	29.5