Table 3 Design factor of safety for overall slopes subjected to various load combinations.

From: Investigating slope stability of multiple stopes prone to instability in the Ziluoyi iron ore mining site

Slope work safety level

Slope engineering design factor of safety

Load combination I

Load combination II

Load combination III

I

1.25–1.20

1.23–1.18

1.20–1.15

II

1.20–1.15

1.18–1.13

1.15–1.10

III

1.15–1.10

1.13–1.08

1.10–1.05

  1. For steep slopes and temporary working gangs, a certain degree of damage is allowed and the design factor of safety may be appropriately reduced.
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