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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。
The shear stress ratio reflects the deformation and failure characteristics of the friction material. By analyzing the relationship between the shear stress and the shear stress ratio caused by the change of the principal stress and the direction, a nonlinear constitutive model of soil considering the principal stress direction is proposed. Taking into account the initial shear modulus of soil, the anisotropy peak strength is closely related to the stress history and loading direction, and gives the method of value of model parameters, and then obtains the stress-strain relationship of component. The rationality of the model is validated by the stress path triaxial test, pure principal stress axis rotation test and the principal stress direction fixed shear test respectively. The comparison between the predicted results and the experimental results shows that the proposed nonlinear elastic model can well describe the deformation characteristics of soils under complicated stress paths.