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首页> 外文会议>Geotechnical Special Publication no.143; Japan-U.S. Workshop on Testing, Modeling, and Simulation; 20030627-29; Boston,MA(US) >AN ELASTO-VISCOPLASTIC MODEL FOR CLAY CONSIDERING DESTRUCTURALIZATION AND PREDICTION OF COMPACTION BANDS
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AN ELASTO-VISCOPLASTIC MODEL FOR CLAY CONSIDERING DESTRUCTURALIZATION AND PREDICTION OF COMPACTION BANDS

机译：考虑解压缩和压实带预测的黏土弹黏塑性模型

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摘要

Instability is usually considered to be a problem of shear failure. Unstable behavior is also observed during the consolidation process, whereby the stress paths depart from the failure line. In the present study, an elasto-viscoplastic constitutive model is extended to describe instability both around the failure state, and away from the failure line. The instability is connected to structural degradation, and formulated as a shrinkage of the overconsolidation boundary surface and static yield surface in the model. One-dimensional consolidation process of clay has been simulated to study the effect of structural degradation on consolidation behavior. The proposed model can effectively reproduce certain types of unstable behavior during consolidation, such as stagnation or a temporary increase in pore water pressure, and a sudden increase in the settlement rate. Moreover, the distributions of axial strain exhibit apparent inhomogeneity when structural degradation is taken into account. This phenomenon of the compressive strain localization is regarded as a compaction band, which may cause large displacements.
机译：通常认为不稳定性是剪切破坏的问题。在固结过程中还观察到不稳定的行为，从而应力路径偏离了破坏线。在本研究中，扩展了弹塑性粘塑性本构模型，以描述破坏状态周围和远离破坏线的不稳定性。该不稳定性与结构退化有关，并表示为模型中超固结边界面和静态屈服面的收缩。已经对粘土的一维固结过程进行了模拟，以研究结构降解对固结行为的影响。所提出的模型可以有效地重现固结过程中的某些类型的不稳定行为，例如停滞或孔隙水压力的暂时增加以及沉降速率的突然增加。此外，当考虑到结构退化时，轴向应变的分布表现出明显的不均匀性。压缩应变局部化的现象被认为是压实带，可能引起大位移。

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