在研究裂缝失稳机理及特征的基础上，应用突变理论，建立了裂缝的突变模型，并得出裂缝稳定性的判据。
Based on analyzing the mechanism of destabilization of crack in dam, the mutation model is established by use of catastrophe theory, and the criterion of the stability of crack is given.
在详细分析相电流差突变量选相基本原理的基础上，对传统相电流差突变量选相元件三相短路故障判据进行了改进。
Based on the detailed analysis of basic principle, the traditional three-phase short-circuit criterion of phase selection element based on sudden-change of phase current differential is improved.
选择边坡内某些监测点的位移突变特征作为强度折减法的材料破坏判据。
The displacement mutation characteristics of monitoring points were chosen as the failure criteria of materials in the shear strength reduction method.
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