非饱和土耦合本构模型的三维化
发布时间：2018-12-11 14:11
【摘要】：非饱和土本构关系模型通常是建立在修正剑桥模型的基础上,并采用了广义的von Mises准则,以描述非饱和土在一般应力状态下的本构行为。该准则假设在π平面上屈服面是个圆形,高估了土体除三轴压缩以外的强度,在平面应变中也会错误估计中主应力比。空间滑动面破坏准则(SMP)考虑了第三应力不变量的影响,屈服面在π平面上为曲边三角形,可以较好地描述一般应力状态下土体的剪切屈服和破坏特性。采用变换应力方法,将SMP准则应用到最近建立的非饱和土耦合本构模型中使其合理的三维化,能够有效地将模型从轴对称应力状态扩展至一般应力状态。根据与试验结果对比表明,改进后的模型在不增加任何参数的情况下,能够较好地模拟非饱和土在三轴伸长等一般应力状态下的行为特性。
[Abstract]:The constitutive relation model of unsaturated soil is usually based on the modified Cambridge model and the generalized von Mises criterion is adopted to describe the constitutive behavior of unsaturated soil under general stress state. The criterion assumes that the yield surface on the 蟺 plane is a circular one, which overestimates the strength of the soil except for triaxial compression and misestimates the principal stress ratio in the plane strain. The effect of the third stress invariant is taken into account in the failure criterion of spatial sliding surface (SMP). The yield surface is curved triangle in 蟺 plane, which can describe the shear yield and failure characteristics of soil under general stress state. By applying the SMP criterion to the recently established coupled constitutive model of unsaturated soil, a reasonable three-dimensional method is proposed, which can effectively extend the model from axisymmetric stress state to general stress state. The comparison with the experimental results shows that the improved model can simulate the behavior of unsaturated soil under general stress state such as triaxial elongation without adding any parameters.
【作者单位】： 中国科学院武汉岩土力学研究所;岩土力学与工程国家重点实验室;桂林理工大学土木与建筑工程学院;
【基金】：国家自然科学基金项目(11072255,11302243) 广西自然科学基金重点项目(2011GXNSFE018004)
【分类号】：TU43
[Abstract]:The constitutive relation model of unsaturated soil is usually based on the modified Cambridge model and the generalized von Mises criterion is adopted to describe the constitutive behavior of unsaturated soil under general stress state. The criterion assumes that the yield surface on the 蟺 plane is a circular one, which overestimates the strength of the soil except for triaxial compression and misestimates the principal stress ratio in the plane strain. The effect of the third stress invariant is taken into account in the failure criterion of spatial sliding surface (SMP). The yield surface is curved triangle in 蟺 plane, which can describe the shear yield and failure characteristics of soil under general stress state. By applying the SMP criterion to the recently established coupled constitutive model of unsaturated soil, a reasonable three-dimensional method is proposed, which can effectively extend the model from axisymmetric stress state to general stress state. The comparison with the experimental results shows that the improved model can simulate the behavior of unsaturated soil under general stress state such as triaxial elongation without adding any parameters.
【作者单位】： 中国科学院武汉岩土力学研究所;岩土力学与工程国家重点实验室;桂林理工大学土木与建筑工程学院;
【基金】：国家自然科学基金项目(11072255,11302243) 广西自然科学基金重点项目(2011GXNSFE018004)
【分类号】：TU43
【参考文献】
相关期刊论文 前4条
1 栾茂田,许成顺,刘占阁,郭莹;一般应力条件下土的抗剪强度参数探讨[J];大连理工大学学报;2004年02期
2 罗汀,姚仰平,松\≡，
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