Assessment of Risk Tendency of Coal Bursting Pressure in Deep Outburst Seam

Table 8

Classification of mining stress concentration.

Evaluation index	Classification	Standard	Scale
Stress concentration factor in mining	I	Reasonable mining sequence	1
		No pillar of coal near the working face
		All cavitation effects
		Reasonable mining sequence
	II	There are a few pillars of coal near the working face	3
		The caving method is generally effective or the filling method is adopted
		Unreasonable mining sequence
	III	There are many coal pillars near the working face	5
		Coal pillar support method