应力迁移法及其在边坡稳定分析中的应用

假定在计算过程中单元竖向应力保持不变和折减前、后大及小主应力方向不变的前提下,给出了应力迁移法的计算式以及操作步骤,并应用ABAQUS软件进行数值模拟分析。然后将应力迁移法应用到边坡稳定性分析的工程实践中,探讨其在实际工程应用中的可行性。通过分析,得出应力迁移法中以特征点位移突变、广义剪应变贯通和等效塑性应变贯通作为失稳判据均具有较好的一致性,而以计算不收敛作为失稳判据得出的安全系数比前三个判据得出的安全系数略大一些的结论。

STRESS MIGRATION METHOD AND ITS APPLICATION IN SLOPE STABILITY ANALYSIS

Based on two assumptions that elemental vertical stress remained unchanged in the process of computation and that the principal stresses directions remaind unchanged before and after reduction,the calculation formulas and operation steps of the stress migration method was presented and then be applied to do numerical simulation analysis by ABAQUS.Then,the stress migration law was applied in the slope stability analysis of resettlement project.Preliminarily,the practical application of the research results in enigeering was discussed.Through the analysis of that project example,it concluded that it had good consistency to judge instability taking the displacement mutations,the plastic zone breakthrough and equivalent plastic strain breakthrough as the criterion,while it was slightly larger than the above criterions to taking calculation misconvergence.