Table 1 Equations of stable probability lines.

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

Isoprobability line

Model equation

Stable probability of 95%

lnN = 1.8197lnS − 0.0201

Stable probability of 90%

lnN = 1.8197lnS − 0.9625

Stable probability of 85%

lnN = 1.8197lnS − 1.5460

Stable-failure boundary (stable probability of 57%)

lnN = 1.8197lnS − 3.3784

Failure-major failure boundary (stable probability of 8%)

lnN = 1.8197lnS − 6.8362

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