期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：571
期号：1
DOI：10.1088/1755-1315/571/1/012104
语种：English
出版社：IOP Publishing
摘要：The correct judgment of the instability state affects the reduction coefficient obtained by the strength reduction finite element method, and then affects the calculation result of the safety factor. Taking the Griffiths slope as an example, the Abaqus software was used to calculate the instability criteria using three types of criteria: non convergence of numerical iteration, sudden change in displacement of characteristic parts, generalized plastic strain or equivalent plastic strain penetration. The results show that there is a corresponding relationship between whether the numerical calculation is converged and whether the slope is unstable. When the calculation is terminated due to non-convergence, the strength reduction coefficient does not change much, and the setting of the finite element convergence condition has little effect on the result. Therefore, it is recommended to use finite element calculation for convergence as a basis for determining slope instability.
