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文章基于数值计算中现有的边坡失稳判据及其存在的问题的分析,考虑到边坡失稳时临界滑移面上的点从极限平衡状态到塑性屈服后的剪切流动状态存在剪应变发生突变的实质,提出了基于强度折减的改进边坡失稳判据:在边坡体内塑性区贯通的基础上,以滑移面上关键点塑性剪应变随强度折减系数的变化率为研究对象,当塑性剪应变的变化率发生突变时所对应的状态为边坡的临界失稳状态,相应的强度折减系数即为边坡的临界安全系数。并通过实例分析验证了改进的边坡失稳判据是可行的。
Based on the analysis of existing slope instability criterion and its existing problems in numerical calculation, taking into account the existence of shear flow state of critical slip surface from the state of limit equilibrium to the plastic yield after the failure of slope According to the essence of the sudden change of shear strain, a criterion for improving slope failure based on strength reduction is proposed. Based on the plastic zone penetration in the slope, the change of plastic shear strain with strength reduction factor When the rate of change of plastic shear strain is abrupt, the corresponding state is the critical state of slope failure, and the corresponding strength reduction coefficient is the critical safety factor of slope. The case analysis shows that the improved slope instability criterion is feasible.