Table 2 Correspondence table of exposure time and time factor T.

From: Collaborative optimization of the Mathews stability graph method and numerical simulation for the limit exposure area in stope

Wall exposure time

Time factor, T

Q′ < 10

Q′ > 10

 > 12 months

0.2

0.3

5–12 months

0.3

0.5

3–5 months

0.5

0.8

 < 3 months

0.8

1.0

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