Strain Localization and Undrained Steady State of Sand
Strain Localization and Undrained Steady State of Sand
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DOI：
10.1061/(asce)0733-9410(1996)122:6(462
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发表时间：
1996-06
期刊：
影响因子：
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通讯作者：
R. Finno;W. W. Harris-W.;M. Mooney;G. Viggiani
中科院分区：
文献类型：
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作者：
R. Finno;W. W. Harris-W.;M. Mooney;G. Viggiani
试验结果表明，在整体不排水条件下测试的松散，细粒，水饱和砂的行为特征是一个平面应变装置。与边界力和变形的局部测量一起，立体摄影测量用于跟踪应变的渐进局部化。试验中的本构行为在本地化之前，可以表征为不排水局部软化或不排水荷载软化和随后的再硬化。在这两种情况下，观察到持续剪切带形成的开始、最大有效摩擦的动员和带的完全形成的一致模式。仅在剪切带中观察到接近稳态的条件。应变局部化对传统推导的稳态州线的影响被认为是最小的不排水荷载软化行为时，观察，但显着不同的稳态线从平面应变和轴对称试验的结果。评估在这两种强制降解条件下进行的试验之间的差异，以评价观察到的差异的实际意义。
Experimental results are presented that characterize the behavior of a loose, fine-grained, water-saturated sand tested under globally undrained conditions is a plane strain apparatus. Together with local measurements of boundary forces and deformations, stereophotogrammetry is used to track the progressive localization of strain. The constitutive behaviors in the tests prior to localization can be characterized as either undrained local softening or undrained load softening and subsequent rehardening. In both cases, a consistent pattern of onset of the formation of the persistent shear band, mobilization of the maximum effective friction, and the complete formation of the band was observed. Conditions approximating steady state only were observed in the shear bands. The effect of strain localization on the conventionally derived steady state line was found to be minimal when undrained load softening behavior was observed, but significantly different steady-state lines were found from results of plane strain and axisymmetric tests. The differences between tests conducted under these two stress conditions assessed to evaluate the practical implications of the observed differences.