边坡稳定数值计算中失稳判据和岩土强度屈服准则

发布时间：2018-09-19 20:06

【摘要】：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3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。
[Abstract]:Through theoretical analysis and typical calculation examples, the instability criterion and instability model of slope stability are discussed in depth, in order to make the numerical calculation method better serve the engineering practice. The mechanical analysis of slope failure shows that the numerical calculation does not converge under strict convergence criteria without the influence of human subjective factors. The mechanical behaviors of the three kinds of commonly used criteria are consistent with each other in the plastic zone of slope and the displacement abrupt change of a particular monitoring point. The analysis results of example 1 further confirm this view. The failure mode of slope is closely related to the yield criterion of rock and soil. In order to make the theoretical calculation conform to engineering practice, the tensile strength criterion based on shear failure, which is typical of M-C, should be revised according to the actual tensile capacity of rock and soil. Based on the tensile modified M-C strength criterion, the calculation flow of tensile shear composite failure strength reduction is further put forward. The calculation results of example 2 show that the calculation process is reasonable and the accuracy of the calculation results is higher than that of the current calculation method.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室水利水电学院;
【基金】：国家自然科学基金资助项目(51109151)
【分类号】：TU43;TV223.3

【相似文献】