人民黄河2024，Vol.46Issue(3)：143-147,155,6.DOI:10.3969/j.issn.1000-1379.2024.03.026
基于不同失稳判据的黄土边坡稳定性数值计算分析
Numerical Analysis of Stability of Loess Slopes Based on Different Instability Criterion
摘要
Abstract
The coefficient of safety is an important index for the evaluation of slope stability.The safety coefficients calculated based on differ-ent instability criteria are significantly different,and the variability of the results will directly affect the evaluation of the stability state of slopes.In this paper,taking the step-type excavated slope of the Wanhuashan Trench Construction Project as the object,FLAC3D finite difference software was used to calculate the safety coefficient of loess slopes based on three different types of instability criteria,namely the calculation non-convergence criterion,the plastic penetration criterion and the displacement abruptness criterion,and to compare and analyze the differences,advantages and disadvantages of the evaluation results of the three criteria.The results of the study shows that there is a cer-tain difference in the magnitude of safety coefficients obtained by using different instability criteria,with the order of magnitude being dis-placement abrupt change criterion＞computational non-convergence criterion＞plastic penetration criterion.The computational non-conver-gence criterion is easy to use and fast to solve,but does not show the change in the plastic zone of the slope during the discounting process.The plastic penetration criterion is not suitable as a criterion for slope instability on its own,but needs to be combined with the unbalanced force rate to be assessed,but it can show the area of shear damage and stretching of the slope.The sudden change of displacement criterion is tedious to solve,but the solution process truly reflects the critical damage state due to the change of slope displacement.For practical condi-tions such as loess slopes,it is recommended to use the fast computational non-convergence criterion to evaluate the slope stability in combi-nation with the plastic zone penetration and the slope displacement change.关键词
黄土边坡/失稳判据/安全系数/强度折减法/稳定性分析Key words
loess slope/destabilization criterion/safety factor/strength discounting method/stability analysis分类
建筑与水利引用本文复制引用
王昕宇,钟佩文,张慧莉,陈卓,田堪良..基于不同失稳判据的黄土边坡稳定性数值计算分析[J].人民黄河,2024,46(3):143-147,155,6.基金项目
国家重点研发计划项目(2017YFC0504703,2016YFE0203400) （2017YFC0504703,2016YFE0203400）
陕西省科技统筹创新工程计划项目(2013KTDZ03-03-01) （2013KTDZ03-03-01）
