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

Table 4

Minimum principal stress analysis results according to mining plan 2.

Mining panel	Stress concentration area	Minimum principal stress value (MPa)				Pillar situation
		Before mining	After mining	Increment	Increase
					(%)
A	4101 roof	−1.62	0	1.62	162	Mined
B	4101 roof	−3.6	0	3.6	100	Mined
	4105 left pillar	−1.75	0.88	2.63	150	Unmined
C	4108 roof	−1.36	0.63	1.99	146	Mined
D	4109 left pillar	−2	0.2	2.2	110	Mined