Research Article

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

Table 4

Parameters of pressure relief measures for I-I section.

Drilling numberDrilling depth (m)Explosive quantity (kg)Elevation angle (°)Loaded length (m)Hole sealing length (m)Drilling diameter (mm)

1#404880121663
2#506070152063
3#608055202263
4#405080121663
5#506070152063
6#608055202263
7#552153
8#202153