摘要
建议了一个非线性弹性剪胀K -G模型 ,即通过变换应力法将SMP破坏准则简单地引入切线剪切模量Gt中 ,使其能反映中主应力σ2 对土体变形强度的影响 ,并通过在切线体积模量Kt中耦合一个反映剪切过程的系数的方法来考虑土的剪胀性。用该模型较好地预测了粘土、砂土的三轴压缩、三轴伸长与平面应变试验结果 ,并用其进行了挡墙土压力的有限元分析计算 ,计算结果与模型试验结果基本吻合。
This paper presents a nonlinear elastic K-G soil model that can reflect the d ilatancy of soils. In the model, the SMP criterion is incorporated into the tang ent shear modulus G t through a transformed stress tensor to account for the ef fe ct of the intermediate principal stress σ 2 on the deformation and streng th of soils,and a coefficient including the deviatoric stress q is multiplied t o the tangent bulk modulus K t to approximately reflect the effect of dilat ancy of soils.The model performance is illustrated through the comparison of the model predictions with the results of triaxial compression and etension tests as well as plane strain tests on sands and clays.Its application in a FEM analy is for a retaining wall test is found to be consistent with the test results.
出处
《土木工程学报》
EI
CSCD
北大核心
2004年第9期69-74,共6页
China Civil Engineering Journal
关键词
非线性弹性
三维应力
剪胀
有限元
nonlinear elasticity
three dimensional stresses
dilat ancy
finite element method$$$$
