考虑主应力方向的土体非线性弹性模型

发布时间：2018-03-30 10:55

本文选题：非线性弹性模型　切入点：主应力方向　出处：《岩土力学》2017年05期

【摘要】：剪正应力比综合反映了摩擦材料的变形与破坏特性。通过分析主应力的大小与方向变化所引起的剪正应力比,结合剪正应力比-剪应变分量的双曲线关系,提出了一种能考虑主应力方向的土体非线性弹性本构模型。考虑到土体初始剪切模量、各向异性峰值强度与应力历史、加载方向密切相关,给出了模型参数的取值方法,进而得到了分量形式的应力-剪应变关系。分别采用应力路径三轴试验、纯主应力轴旋转试验以及主应力方向固定的剪切试验验证了模型的合理性。预测结果与试验结果对比表明,提出的非线性弹性模型能较好地描述复杂应力路径下土体变形特性。
[Abstract]:The shear normal stress ratio comprehensively reflects the deformation and failure characteristics of friction materials. By analyzing the shear normal stress ratio caused by the variation of the magnitude and direction of the principal stress, the hyperbolic relationship between the shear normal stress ratio and the shear strain component is combined. A nonlinear elastic constitutive model of soil considering the direction of principal stress is proposed. Considering that the initial shear modulus of soil, the peak anisotropic strength and the stress history are closely related to the loading direction, the method of determining the parameters of the model is given. The stress-shear strain relation in the form of component is obtained. The pure principal stress axis rotation test and shear test with fixed principal stress direction verify the rationality of the model. The comparison of the predicted results with the experimental results shows that the proposed nonlinear elastic model can better describe the deformation characteristics of soil under complex stress paths.
【作者单位】：后勤工程学院岩土力学与地质环境保护重庆市重点实验室;重庆市地质灾害防治工程技术研究中心;青岛理工大学理学院;重庆交通大学材料科学与工程学院;
【基金】：国家自然科学基金项目(No.11572165)~~
【分类号】：TU43

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