铁道科学与工程学报2018，Vol.15Issue(5)：1155-1163,9.
不同应力路径下非饱和黄土结构特性及其本构模型研究
Study on structural characteristics and constitutive model of unsaturated loess under different stress paths
摘要
Abstract
The undisturbed loess and the corresponding reconstituted loess with different water content are studied by stress ratio loading test. The structural variation characteristics of loess under different stress ratios triaxial test was discussed, and the comprehensive structure potential parameters under different stress states were obtained. The elastoplastic constitutive model of unsaturated loess is established by selecting proper hardening parameters. The results show that the p?εvcurves of undisturbed loess and remolding loess are obviously different, and the volumetric strain εvof undisturbed loess is smaller than remolding loess with the same stress ratio k.Undisturbed loess structural failure strength decreases with the increase of water content and in power function relationship, Structural parameter mpdecreases with increasing spheric stress p and stress ratio k,structural parameters under different stress ratio stable almost at the same level. Structural strain mp*ε vand stress p in the curves of undisturbed loess presents hyperbolic form, to select the appropriate hardening parameter elastoplastic constitutive model can built better simulate stress and strain characteristics of the structural loess under different confining pressure and initial water content.关键词
应力路径/非饱和黄土/结构性/应力比/本构模型Key words
stress path/unsaturated loess/structural properties/stress ratio/constitutive model分类
建筑与水利引用本文复制引用
庞旭卿,张腾..不同应力路径下非饱和黄土结构特性及其本构模型研究[J].铁道科学与工程学报,2018,15(5):1155-1163,9.基金项目
陕西省教育厅自然专项科研计划资助项目(16JK1171) （16JK1171）
陕西铁路工程职业技术学院科研基金资助项目(STY201509) （STY201509）
