Void ratio evolution inside shear bands in triaxial sand specimens studied by computed tomography
Void ratio evolution inside shear bands in triaxial sand specimens studied by computed tomography
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DOI：
10.1680/geot.1996.46.3.529
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发表时间：
1996-09-01
期刊：
影响因子：
5.8
通讯作者：
Mazerolle, F
中科院分区：
文献类型：
--
作者：
Desrues, J;Chambon, R;Mazerolle, F
本文报道了用计算机层析技术对砂土三轴试验中应变局部化现象的研究，定性和定量地检测和描述了应变局部化现象的发生和发展，描述了应变局部化现象中的复杂几何结构，确定了应变局部化区的局部孔隙比演化。在60 kPa围压下对密实和疏松的Hostun RF砂试件进行了试验，结果表明，应变局部化随试验条件的不同而呈现不同的局部化模式;对于许多测试的样品发现了同时涉及中心圆锥和成对的一组平面的机制，剪切带中局部孔隙比的演变与整体孔隙比测量的比较支持了一个重要的结论，在剪切区达到孔隙比，该比值与根据总体测量值定义的最终孔隙比显著不同;后者缺乏物理相关性。
A study of strain localization in triaxial tests on sand, using computed tomography is reported, The inception and the development of the localization are detected and described, both qualitatively and quantitatively, The complex geometrical structures involved in the localization patterns are described and the local void ratio evolution in the localization zone(s) is determined, Dense and loose Hostun RF sand specimens were tested under a confining pressure of 60 kPa, It is shown that strain localization can occur in different localization patterns depending on test conditions; a mechanism involving, simultaneously, a central cone and a set of planes in pairs was found for many of the specimens tested, The comparison of the local void ratio evolution in the shear zones with the global void ratio measurement supports the important conclusion that a limit void ratio is reached in the shear zones, This ratio is significantly different from the final void ratio defined from the global measurements; the lack of physical relevance of the latter is established.