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强度折减有限元稳定分析方法是目前应用及研究较多的一种分析方法。如何根据有限元计算结果来判别边坡稳定性,是强度折减有限元稳定分析方法的一个关键性问题。强度折减有限元法的失稳判据主要有3种:第一种以有限元解的收敛性判定失稳状态;第二种根据计算域内最大节点位移与折减系数之间关系曲线变化特征判定失稳状态;第3种通过计算域内塑性区是否贯通判定失稳状态。利用ADINA有限元通用软件,对二个不同的边坡算例进行强度折减计算,分别采用3种失稳判据进行稳定性分析,对3种失稳判据的适用性、3者之间的一致性、各自的适用范围进行了研究。研究表明,对于均质边坡,3种失稳判据存在较好的一致性,但是对于非均质边坡,塑性区贯通判据在应用范围上存在局限性。
Strength reduction finite element method is the stability analysis and application of more analytical methods. How to judge the slope stability based on the finite element calculation results is a key issue for the strength reduction finite element method. There are mainly three kinds of instability criterion for strength reduction finite element method: the first one is to determine the instability state by the convergence of the finite element solution; the second one is to determine the variation characteristics of the relationship curve between the maximum node displacement and the reduction coefficient in the calculation domain Determine the state of instability; the third through the calculation of whether the area within the plastic zone through the determination of instability. Using ADINA finite element general software, the strength reduction calculation of two different slope cases is carried out. Three kinds of instability criterion are respectively used for stability analysis. The applicability of the three kinds of instability criterion, The consistency of their respective scope of application has been studied. The results show that there is a good agreement among the three kinds of instability criterion for homogeneous slope, but for non-homogeneous slope, there are limitations in the application range of plastic zone penetration criterion.