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

Table 3

Maximum principal stress analysis results according to mining plan 1.

Mining panel	Stress concentration area	Maximum principal stress (MPa)				Pillar situation
		Before mining	After mining	Increment (MPa)	Increase (%)
C	4104 roof	−6.6	−16.2	−9.6	145	Mined
B	4104 roof	−16.2	−4.2	12	74	Mined
	4100 right pillar	−3.6	−9.6	−6	167	Unmined
D	4110 left pillar	−8	−3.6	4.4	−55	Mined
	4109 left pillar	−9.6	−3.9	5.7	−59	Mined
A	41–2 right pillar	−10	−2.75	7.25	−72.5	Mined
	4100 right pillar	−9.68	−2.53	7.15	−72.5	Mined