Strain softening and shear band formation of sand in multi-axial testing
Strain softening and shear band formation of sand in multi-axial testing
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DOI：
10.1680/geot.1996.46.1.63
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发表时间：
1996-03
期刊：
影响因子：
5.8
通讯作者：
J. Chu;S. Lo;I. Lee
中科院分区：
文献类型：
--
作者：
J. Chu;S. Lo;I. Lee
对粒状土在σ1 σ2 σ3条件下沿沿着宽谱路径的应变软化进行了试验研究。为了确保观察到的行为不是由于边界缺陷引起的畸变，使用了专门设计的多轴单元。应力和应变路径的微处理器控制被纳入测试程序。特别是，应变路径测试，其中应变增量比dev/de 1被控制到一个特定的值被广泛使用。采用照相技术检测剪切带的形成。应变软化被认为是路径依赖。它可以采取剪切带形成的形式，或者它可以在没有任何非均匀性发展的情况下发生。剪切带的形成不一定是边界缺陷的结果，但可能是样品对某些应力状态和剪切路径的不可避免的响应。建立了剪切带形成的条件，并给出了三种不同的应变软化特性。
The strain softening of a granular soil under a σ1 ≠ σ2 ≠ σ3 condition and along a wide spectrum of paths was investigated experimentally. To ensure that the observed behaviour was not an aberration due to boundary imperfections, a specially designed multi-axial cell was used. Microprocessor control of both stress and strain paths was incorporated into the testing programme. In particular, strain path testing where the strain increment ratio dev/de1 was controlled to a specified value was used extensively. A photographic technique was used to detect the initiation of shear band. Strain softening was found to be path-dependent. It can take the form of shear band formation, or it can occur without the development of any non-homogeneity. Shear band formation is not necessarily a consequence of boundary imperfections, but can occur as the inevitable response of a sample to certain stress states and shear paths. The conditions for shear band formation were established and three types of strain softening identi...