Mechanism of Coal Burst and Prevention Practice in Deep Asymmetric Isolated Coal Pillar: A Case Study from YaoQiao Coal Mine

Table 5

Parameters of pressure relief measures for III-III section.

Drilling number	Drilling depth (m)	Explosive quantity (kg)	Elevation angle (°)	Loaded length (m)	Hole sealing length (m)	Drilling diameter (mm)
1#	45	60	75	15	16	63
2#	55	80	60	20	20	63
3#	65	100	45	25	22	63
4#	44	60	75	15	16	63
5#	55	80	60	20	20	63
6#	65	88	50	22	22	63
7#	60	—	2	—	—	153
8#	20	—	2	—	—	153