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

Table 1

Judgment table for district’s mining adoption level.

Position	Goaf length (m)	Goaf width (m)	Mining depth (m)	L/H	Level of adoption
East wing goaf	1610	1100	750	1.47	Full extraction
West wing goaf (I-I section)	650	310		0.41	Insufficiency mining
West wing goaf (III-III section)	700	180		0.24