边坡稳定数值计算中失稳判据和岩土强度屈服准则

通过理论分析和典型算例计算，对边坡稳定数值计算中边坡的失稳判据和失稳模式进行了深入的讨论，旨在使数值计算方法更好地服务于工程实际。边坡失稳破坏的力学分析表明，排除人为主观因素的影响，在严格收敛标准下数值计算不收敛、边坡塑性区贯通和特定监测点位移突变这三类常用判据内在的力学表现是一致的，算例1的分析结果进一步证实了该观点。边坡的失稳模式与岩土体的屈服准则密切相关，为使理论计算符合工程实践，应根据岩土体实际抗拉能力对以M-C为典型代表的基于剪切破坏的强度准则进行抗拉修正。以抗拉修正后的M-C强度准则为基础，进一步提出了拉剪复合破坏的强度折减计算流程，算例2的计算结果表明该计算流程是合理的且计算结果的精度要高于现行的计算方法。

Discussions on Failure Criteria and the Yield Criterion in the Numerical Calculations of Slope Stability in the Numerical Calculations of Slope Stability

Proceed from actual engineering, the failure criteria and failure models of slopes in the numerical calculations of slope stability were discussed extensively by theoretical analysis and two typical examples. Qualitative mechanical analyses were undertaken, and the following conclusion was obtained that, if subjective factor was avoid the frequently-used three types of criterion could reflect concordantly the slope failures under strict convergence criteria, which was verified by the numerical example 1. Failure modes of the slope were determined by the yield criterion of rock and soil mass. In order to make the numerical analyses satisfied with the engineering practice, the tensile modification should be carried out in the yield criterion based on shear failure like Mohr-Coulomb yield criterion. On the basis of shear and tensile composite failure of rock and earth mass, a numerical strength reduction process was set up, and this process was proved more reasonable and justified by the Calculation Example.2.