Wave velocities and their relation to fabric evolution during the shearing of sands
Wave velocities and their relation to fabric evolution during the shearing of sands
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DOI：
10.1016/j.soildyn.2006.05.006
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发表时间：
2007
影响因子：
4
通讯作者：
Chung-Jung Lee;H. Y. Huang
中科院分区：
文献类型：
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作者：
Chung-Jung Lee;H. Y. Huang
在单调剪切和循环剪切过程中，砂土的组构对应力应变行为有很强的控制作用。在这项研究中，两对压电陶瓷换能器内置到一个三轴单元，这是能够测量的压缩和剪切波的速度在轴向方向上传播，开发。为了研究砂土的力学特性，进行了一系列不同应力路径下的三轴试验，并同时测量了压缩波和剪切波的速度。测得的波速变化，这取决于应力路径和应力状态。一个新的措施，被称为织物指数，来自使用弹性理论的交叉各向异性材料与基于细观力学的应力-应变模型。该指数被用来评估组构演化沿着不同的应力路径在三种类型的沙子。详细讨论了围压、应力比、应力路径和应力历史对组构指数的影响。
The fabric of a sand strongly dominates its stress–strain behavior during monotonic and cyclic shearing. In this study, two pairs of piezoelectric ceramic transducers built into a triaxial cell, which are capable of measuring the compressive and shear wave velocities propagating in the axial direction, were developed. A series of triaxial tests using different stress paths were conducted on sand to investigate their mechanical properties and to simultaneously measure the compressive and shear wave velocities. The measured wave velocities varied, depending on stress path and stress state. A new measure, referred to as the fabric index, was derived using elastic theory for a cross-anisotropic material in association with a micromechanics-based stress–strain model. This index was used to evaluate fabric evolution along various stress paths in three types of sand. The effects of confining pressure, current stress ratio, stress path, and stress history on the fabric index are discussed in detail.