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Mathematical Problems in Engineering
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Mathematical Problems in Engineering
/
2021
/
Article
/
Fig 8
/
Research Article
Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on
In Situ
Stress Measurement
Figure 8
Distribution of principal stress on the main roof trend line: (a)
σ
1
and (b)
σ
1
–
σ
3
.
(a)
(b)