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Mathematical Problems in Engineering
/
2021
/
Article
/
Tab 1
/
Research Article
Numerical Simulation of the Stress Field in Repeated Mining of Coal Seams Based on
In Situ
Stress Measurement
Table 1
Evaluation index of the rock mass stress state by the strength-stress ratio.
Evaluation index
Index value
High
Middle
Low
σ
cm
/
σ
1
m
<1.4
1.4∼3.6
>3.6