CAJ | 학술논문

　　在土体的剪切变形过程中，当主应力方向产生旋转时，主应变增量方向与主应力方向之间存在显著的非共轴现象。同时，机动摩擦角、膨胀角随着累积塑性偏应变的增长而增加，土体具有应变硬化的特点。传统的弹塑性本构模型不能够反映上述现象对地基承载力特性的影响。为了能够对地基承载力问题进行合理的分析，建立了一种非共轴应变硬化模型，并将该模型运用到有限元计算中。通过与三轴试验和离心机模型试验结果进行对比，对该模型在数值应用中的合理性进行了验证。研究结果表明，该模型能够对不同围压下的应力‐应变关系进行预测。对浅基础承载力问题进行研究时，非共轴应变硬化模型的计算结果比传统弹塑性本构模型更加接近于离心机试验结果，验证了该模型的数值应用合理性。
　　재토체적전절변형과정중，당주응력방향산생선전시，주응변증량방향여주응력방향지간존재현저적비공축현상。동시，궤동마찰각、팽창각수착루적소성편응변적증장이증가，토체구유응변경화적특점。전통적탄소성본구모형불능구반영상술현상대지기승재력특성적영향。위료능구대지기승재력문제진행합리적분석，건립료일충비공축응변경화모형，병장해모형운용도유한원계산중。통과여삼축시험화리심궤모형시험결과진행대비，대해모형재수치응용중적합이성진행료험증。연구결과표명，해모형능구대불동위압하적응력‐응변관계진행예측。대천기출승재력문제진행연구시，비공축응변경화모형적계산결과비전통탄소성본구모형경가접근우리심궤시험결과，험증료해모형적수치응용합이성。
In the process of shearing deformation of soil ,the non‐coaxial phenomenon between the directions of principal strain increment and principal stress is very apparent w hile the principal stress direction is rotating .Meanwhile ,the mobile friction angle and dilation angle increase accompanying with the accumulation of plastic deviator strain ,so soil mass has strain hardening characteristic .The traditional elastic‐plastic constitutive model could not reflect the influence of these phenomena on foundation bearing capacity .In order to research into the bearing capacity problem reasonably ,a non‐coaxial strain hardening model is suggested and adopted into the FEM calculation .T he rationality in numerical application is confirmed by the comparison with triaxial test and centrifuge model test results .T he test results show that this model can predict the stress‐strain relation under different confining pressure . When the non‐coaxial strain hardening model is used to analyze the shallow foundation bearing capacity problem ,compared with the traditional elastic‐plastic constitutive model , its numerical results are more close to the centrifuge test results ,w hich indicates that this model can be adopted into the numerical analyses reasonably .