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基于破损力学理论,将结构性黄土抽象成具有一定结构强度的结构块和摩擦带组成的二元介质模型。对结构性黄土体来说,局部化剪切带问题也是土体的破损问题,剪切带萌生发展的实质就是结构块向摩擦带转化的动态过程。应用结构性土的双参数破损率二元介质本构模型,采用数值分析方法模拟了平面应变压缩条件下结构性土中局部化剪切带萌生、扩展的过程,研究了不同缺陷方案下局部化剪切带的形态、特性与规律,发现结构性土中局部化剪切带的发展起初是由一段段不连续的微小局部破坏区域在外荷载逐步作用下渐进扩展连接贯通而形成整体剪切带的破坏形式。二元介质本构模型和常规有限元的结合,形象生动地再现了局部化剪切带萌生、发展的过程。
Based on the theory of damage mechanics, the structural loess is abstracted into a binary medium model composed of structural blocks and friction bands with certain structural strength. For structural loess, the problem of localized shear zone is also the problem of soil damage. The essence of shear zone initiation and development is the dynamic process of structural block transformation to friction belt. By using the constitutive model of two-parameter medium damage ratio constitutive model, the process of initiation and propagation of localized shear zone in structural soil under plane strain compression is simulated by numerical analysis method. Localized It is found that the development of localized shear zone in structural soil is caused by the gradual expansion of the small local failure zone under the action of external load and the formation of integral shear band Damage form. Binary medium constitutive model and the combination of conventional finite element, image vividly reproduce the process of localized shear band initiation and development.