应用强度折减有限元法分析土坡稳定的适应性

为深入研究土体采用的本构模型以及安全系数的控制标准．讨论了土体采用邓肯E—B模型和理想弹塑性的广义米塞斯模型时，强度折减有限元法分析土坡稳定的适应性．发现邓肯E—B模型的适应性较差，土坡内应变发展不均匀，不能形成明显的剪切带．而弹塑性的广义米塞斯模型则形成剪切带，剪切带两侧土体具有明显的相对滑移趋势．因此，弹塑性模型更适合干强度折减有限元法分析土坡稳定性．

Soil constitutive relation for slope stability by finite element method with the discount shear strength technology

Applicability of the constitutive relation of soil and the criterion for slope stability need more research in detail. The Duncan E - B model and the generalized Mises model as the ideal elastic - plasticity model are adopted, and the applicability that the soil constitutive relation for slope stability estimation by FEM with shear strength reduction will be discussed. It was found that the Duncan E-B model is not suit for this method, because the distribution of the soil shear strain in the slope doesn't rise uniformity during the developing to slope unstable, and the shear bound doesn't form distinctly. Whereas if the generalized Mises model is adopted, the shear bound was formed distinctly, and the soil body outside the shear bound would be slip trend visibly. So the elastic - plasticity model is more compatible to slope stability analysis by FEM with shear strength reduction.