这个公式是考虑板在极限平衡状态，考虑了材料的塑性。
This method is based upon the equilibrium of forces under ultimate loading, and consequently the effect of plasticity of the material is included in consideration.
此时，系统达到临界平衡状态时所对应的材料强度降低倍数即为整体最小安全系数，临界平衡状态定义为边坡内的塑性屈服区能够形成潜在的滑移通道时的状态。
The minimum safety coefficient was defined as the reduction coefficient, when the system was fairly close to the limit equilibrium state through decrement of material strength step by step.
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