Construction and Application of Mathematical Model of Stable Fracture Development Zone of Roof

Table 1

Construction parameters of ordinary high-level drilling.

Bore number	Axial horizontal angle with the tunnel (°)	Obliquity (°)	Opening height (m)	Hole depth (m)
5^#	22	8	3	92
10^#	25	11	3	72
15^#	36	15	3	57