长江科学院院报
長江科學院院報
장강과학원원보
JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTITUTE
2015年
5期
89-94
,共6页
非共轴%本构理论%应变软化%单剪试验%数值分析
非共軸%本構理論%應變軟化%單剪試驗%數值分析
비공축%본구이론%응변연화%단전시험%수치분석
non-coaxial%constitutive theory%strain softening%simple shear test%numerical analysis
在土体主应力方向的旋转过程中，主应力方向与塑性主应变增量方向之间存在非共轴现象，传统的共轴本构理论无法合理描述非共轴现象及其对应力－应变关系的影响。通过有限元二次开发，在应变软化共轴模型的基础上引入了角点结构非共轴理论，对密砂的单剪试验进行数值模拟及分析，系统地研究了非共轴现象及其影响。数值分析结果与试验结果的对比表明：非共轴模型能够合理地反映非共轴现象及其影响，且非共轴现象受到静止侧压力系数、竖向应力和流动法则等因素的显著影响。
在土體主應力方嚮的鏇轉過程中，主應力方嚮與塑性主應變增量方嚮之間存在非共軸現象，傳統的共軸本構理論無法閤理描述非共軸現象及其對應力－應變關繫的影響。通過有限元二次開髮，在應變軟化共軸模型的基礎上引入瞭角點結構非共軸理論，對密砂的單剪試驗進行數值模擬及分析，繫統地研究瞭非共軸現象及其影響。數值分析結果與試驗結果的對比錶明：非共軸模型能夠閤理地反映非共軸現象及其影響，且非共軸現象受到靜止側壓力繫數、豎嚮應力和流動法則等因素的顯著影響。
재토체주응력방향적선전과정중，주응력방향여소성주응변증량방향지간존재비공축현상，전통적공축본구이론무법합리묘술비공축현상급기대응력－응변관계적영향。통과유한원이차개발，재응변연화공축모형적기출상인입료각점결구비공축이론，대밀사적단전시험진행수치모의급분석，계통지연구료비공축현상급기영향。수치분석결과여시험결과적대비표명：비공축모형능구합리지반영비공축현상급기영향，차비공축현상수도정지측압력계수、수향응력화류동법칙등인소적현저영향。
In the process of rotation of the orientation of principal stress,the non-coaxial phenomenon exists between the orientations of the principal stress and plastic strain rate.However,the traditional constitutive theory could not reflect the non-coaxial phenomenon and its influence on the relationship between stress and strain.The yield vertex non-coaxial theory is adopted into a strain softening coaxial model to research the non-coaxial phenomenon and its influence in the numerical simulations of simple shear test on dense sand.Comparison between numerical result and test result suggests that the non-coaxial model could reflect the non-coaxial phenomenon and its influence reasona-bly,and also,the roles of non-coaxial model are considerably influenced by static lateral pressure coefficients,ver-tical stress and flow rules.
