A numerical method was used in order to establish the constitutive relationship of sands under different stress paths. Firstly, based on the numerical method modeling the constitutive law of sands, the elastoplasticco...A numerical method was used in order to establish the constitutive relationship of sands under different stress paths. Firstly, based on the numerical method modeling the constitutive law of sands, the elastoplasticconstitutive relationship of sand was established for three paths: the constant proportion of principle stress path, the conventional triaxial compression (CTC) path, and the p=constant (TC) path. The yield lines of plastic volumetric strain and plastic generalized shear strain were given. Through visualization, the three dimensional surface of the stress-strain relationship in the whole stress field (p, q) obtained under the three paths was plotted. Also, by comparing the stress-strain surfaces and yield locus of the three stress paths, the differences were found to be obvious, which demonstrates that the influence of the stress paths on constitutive law was not neglected. The numerical modeling method overcame the difficulty of finding an analytical expression for plastic potential. The results simulated the experimental data with an accuracy of 90 % on average, so the constitutive model established in this paper provides an effective constitutive equation for this kind of engineering, reflecting the effect of practical stress paths that occur in sands.展开更多
Based on the definition of class shortest path in weighted rough graph,class shortest path algorithm in weighted rough graph is presented,which extends classical shortest path algorithm.The application in relationship...Based on the definition of class shortest path in weighted rough graph,class shortest path algorithm in weighted rough graph is presented,which extends classical shortest path algorithm.The application in relationship mining shows effectiveness of it.展开更多
文摘A numerical method was used in order to establish the constitutive relationship of sands under different stress paths. Firstly, based on the numerical method modeling the constitutive law of sands, the elastoplasticconstitutive relationship of sand was established for three paths: the constant proportion of principle stress path, the conventional triaxial compression (CTC) path, and the p=constant (TC) path. The yield lines of plastic volumetric strain and plastic generalized shear strain were given. Through visualization, the three dimensional surface of the stress-strain relationship in the whole stress field (p, q) obtained under the three paths was plotted. Also, by comparing the stress-strain surfaces and yield locus of the three stress paths, the differences were found to be obvious, which demonstrates that the influence of the stress paths on constitutive law was not neglected. The numerical modeling method overcame the difficulty of finding an analytical expression for plastic potential. The results simulated the experimental data with an accuracy of 90 % on average, so the constitutive model established in this paper provides an effective constitutive equation for this kind of engineering, reflecting the effect of practical stress paths that occur in sands.
基金Natural Science Foundation of Shandong Province of China (Y2004A04)Natural Science Foundation of Shandong Province of China (Y2006A12)Foundation of Ministry of Fujian Province Education of China (JA04268).
文摘Based on the definition of class shortest path in weighted rough graph,class shortest path algorithm in weighted rough graph is presented,which extends classical shortest path algorithm.The application in relationship mining shows effectiveness of it.
