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首页> 外文会议>Workshop on Constitutive and Centrifuge Modelling: Two Extremes, Jul 8-13, 2001, Monte Verita, Switzerland >Localisation and critical states
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Localisation and critical states

机译：本地化和关键状态

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摘要

Localised deformation develops in undisturbed samples of soft, medium sensitive Kreuzlingen Clay when they are sheared in undrained triaxial extension. The two localisation modes identified were necking and shear banding, with the deformation patterns the samples displayed after the tests indicating that both localisation modes developed simultaneously. Necking is strongly linked to the specific kinematic constraints of the triaxial extension test and does not necessarily hint at an unstable path of the tested soil. Modelling of an undrained plane-strain extension test using the Modified Cam-Clay model with a mixed finite element formulation further illustrates that even the formation of shear bands is not inevitably linked to an unstable path of the material or softening. Although additionally, for pre-peak loads, the behaviour of the Kreuzlingen Clay samples could well be described by a critical state constitutive model, the abrupt softening of these samples in the post-peak stages of the triaxial extension tests then however indicates a marked degradation of the shear strength within the zones of localised shear deformation for this normally consolidated clay.
机译：当在不排水的三轴延伸方向上剪切时，在柔软，中等敏感性的克罗伊茨林根粘土的未受扰动的样品中会发生局部变形。确定的两个定位模式是颈缩和剪切带，测试后显示的样品变形模式表明两个定位模式同时发展。缩颈与三轴延伸试验的特定运动学约束密切相关，并不一定暗示试验土壤的不稳定路径。使用带有混合有限元公式的Modified Cam-Clay模型对不排水平面应变延伸测试进行建模，进一步说明，即使剪切带的形成也不可避免地与材料的不稳定路径或软化联系在一起。尽管此外，对于峰前载荷，克罗伊茨林根粘土样品的行为可以通过临界状态本构模型很好地描述，但是在三轴延伸试验的峰后阶段，这些样品的突然软化却显示出明显的退化。通常固结的粘土在局部剪切变形区域内的抗剪强度的平均值。

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