Open AccessSlope instability judgment criteria in FEM based on strength reduction method
Author(s) -
Xiaogang Peng,
Jia Li,
Youzhi Li,
Jian Jiang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/571/1/012104
Subject(s) - strength reduction , instability , finite element method , convergence (economics) , reduction (mathematics) , displacement (psychology) , mathematics , safety factor , stability (learning theory) , structural engineering , mathematical analysis , mechanics , computer science , geometry , engineering , physics , psychology , machine learning , economics , psychotherapist , economic growth
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.