The concept of the structural performance safety index is put forward and its calculation method is derived based on the structural deformation limit state equation.
提出了结构性能安全指数的概念，并以结构的变形极限状态方程为基础得到了结构设计性能安全指数的计算方法和结构性能等级的划分标准。
The FEM computation of engineering can reflect the characteristic of deformation, stress state and destroy mechanism of slope, but can not get an intuitionistic safety factory.
工程中的有限元计算能反映边坡的变形特征、应力状态和破坏机理，但是尚不能给出一个直观的安全系数。
Displacement and deformation of deep pit supporting system concern not only security of the pit, but also the safety of the surrounding environment.
深基坑支护系统的位移与变形不仅关系到基坑本身的安全问题，也影响到周边环境的安全。
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