In the article, a simple method is discussed to confirm the principal stress direction un-den the plane stress condition.

文章给出了一种判断平面应力状态主应力方向的简便方法。

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A valid method to make the anisotropic deformation behavior of load bearing unit clear is to research principal stress and principal strain relationship, and true triaxial test is a necessary means.

弄清受荷单元的主应力主应变关系是认识各向异性变形性状的有效方法，而真三轴试验是必要的手段。

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Stability method based on slip surface FE stress and shear strength reduction method are two principal methods for FEM slope stability analysis.

基于滑面上应力分析法和强度折减法是边坡稳定有限元分析方法中两类主要的方法。

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