土石混合体细观数值模拟的弹塑性自适应有限元分析

In the mesoscopic elastic-plastic finite element analysis of soil-rock mixture, it is necessary to adopt adaptive meshes to avoid the blindness of mesh refining or remeshing in order to overcome the stress concentration near the irregular block blocks and better capture the large plastic strain in the plastic zones and further improve the calculation accuracy of the plastic zones. In this paper, the adaptive remeshing algorithm based on a posteriori error estimation is adopted and the resulting Python script of the elastic-plastic adaptive finite element program is written combining with Abaqus software. The whole process of adaptive solution is realized for mesoscopic numerical simulations of soil-rock mixture. By applying the python script to the mesostructure numerical simulations of several typical two-dimensional soil-rock mixtures, the effectiveness and adaptability of the adaptive finite element method based on remeshing algorithm are numerically verified in overcoming the stress concentration, better capturing the large plastic strain in the plastic zone and improving the calculation accuracy of the plastic zone.