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本构模型的三维化对反映材料在三维应力状态下的力学特性具有重要意义。在π平面上,广义Mises三维化方法不能反映应力洛德角对材料变形和强度的影响,g(θ)等方法不能合理地反映应力水平对变形和强度的影响。变换应力三维化方法考虑了应力洛德角影响,数学表达简洁,不增加模型参数,便于计算应用。将作者等人所提的超固结非饱和土本构模型与基于SMP(spatially mobilized plane)的变换应力方法结合,实现了超固结非饱和土的三维化,达到了从剪切屈服到剪切破坏的连续过渡。该模型能够描述不同应力洛德角下超固结非饱和土的硬化、软化、剪胀特性,并与试验数据进行了对比。
The three-dimensional constitutive model is of great significance to reflect the mechanical properties of materials under three-dimensional stress conditions. On the π plane, the generalized Mises three-dimensional method can not reflect the influence of stress Lode angles on the deformation and strength of materials. The methods such as g (θ) can not reasonably reflect the influence of stress levels on the deformation and strength. The three-dimensional transformation stress method considers the influence of stress Loch angle, the mathematical expression is concise, the model parameters are not increased, and the calculation and application are convenient. By combining the constitutive model of overconsolidated unsaturated soil with the method of transformation stress based on SMP (spatially mobilized plane), the author has realized the three-dimensional formation of overconsolidated unsaturated soils, from the shear yielding to the shearing Cut the destruction of the continuous transition. The model can describe the hardening, softening and dilatancy characteristics of overconsolidated unsaturated soils under different stress, and compared with the experimental data.