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Mathematical Problems in Engineering
/
2021
/
Article
/
Fig 4
/
Research Article
Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on
In Situ
Stress Measurement
Figure 4
σ
cm
/
σ
1
m
vs. depth: (a) all rock formations and (b) roof and floor.
(a)
(b)