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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。
Assuming that the vertical stress of the element remains the same and the principal stress direction of the large and the small before and after the reduction is constant, the calculation formula and operation steps of the stress transfer method are given and the numerical simulation is carried out by ABAQUS software analysis. Then the stress transfer method is applied to engineering practice of slope stability analysis, and its feasibility in practical engineering application is discussed. Through the analysis, it is concluded that the stress migration method has good consistency with displacement discontinuities of characteristic points, generalized shear strain-through and equivalent plastic strain penetration as the criterion of instability, but not convergence as the criterion of instability The safety factor is slightly larger than the safety factor obtained from the first three criteria.