Optimum Selection of Mining Plans for Pillars Containing Interlayers Based on Numerical Simulation

Table 5

Maximum principal stress analysis results according to mining plan 2.

Mining panel	Stress concentration area	Maximum principal stress (MPa)				Pillar situation
		Before mining	After mining	Increment	Increase (%)
				(MPa)
A	4101 roof	−9.2	−13.5	−4.3	47	Mined
B	4101 roof	−13.5	−3.4	9.1	67	Mined
	4105 left pillar left	−7.37	−5.32	2.05	28	Unmined
C	4108 left pillar left	−8.65	−4.75	3.9	45	Unmined
	4109 left pillar left	−9.1	−9.6	−0.5	6	Unmined
D	4109 left pillar left	−9.6	−3.84	5.76	60	Mined
	4109 right pillar	−7.95	−3.8	4.15	52	Mined