【摘要】 用强度折减有限元方法对开挖边坡的稳定性进行了较为全面的研究。分析结果表明 :当折减系数达到某一数值时 ,边坡内一定幅值的广义剪应变自坡底向坡顶贯通 ,认为边坡破坏 ,定义此前的折减系数为安全系数 ;和强度指标相比 ,弹性模量、泊松比、剪胀角和侧压力系数对边坡的安全系数影响不大 ;开挖边坡和天然边坡具有相似的破坏形式 ,表明强度折减有限元方法适用于开挖边坡的稳定性分析。最后指出 ,强度折减有限元法具有广泛的适用性和良好的应用前景更多还原

【Abstract】 An elasto plastic shear strength reduction FEM is used to analyze the stability of excavation slope. A well defined failure shear strain zone is formed in the excavation slope. It is found that elastic modules, Poisson′s ratio, dilation angle and lateral pressure coefficient, compared with cohesion and friction angle, have little effect on safety factor of slope. As failure pattern of excavation slope is similar with that of natural slope, it is concluded that the method is appropriate for stability analysis of excavation slope. It is believed that the shear strength reduction FE method can be widely applied in the engineering practice because this method benefits over limit equilibrium method.更多还原