Experimental studies of rotation angles of principal strain axes for wet sandy soil specimens under uniaxial compression

GU Lu; WANG Xue0-bin; DU Ya-zhi; FENG Wei-wu

doi:10.16285/j.rsm.2016.04.014

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Experimental studies of rotation angles of principal strain axes for wet sandy soil specimens under uniaxial compression

更新时间：2026-06-25

- Experimental studies of rotation angles of principal strain axes for wet sandy soil specimens under uniaxial compression
- Vol. 37, Issue 4, Pages: 1013-1022(2016)
- 作者机构：
  
  1. 辽宁工程技术大学力学与工程学院,辽宁,阜新,123000
  2. 辽宁工程技术大学计算力学研究所，辽宁阜新 123000 3. 中国矿业大学(北京) 力学与建筑工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.04.014
  CLC： TU454
- Online First：09 June 2018，
  
  Published：2016
- 稿件说明：
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GU Lu, WANG Xue0-bin, DU Ya-zhi, et al. Experimental studies of rotation angles of principal strain axes for wet sandy soil specimens under uniaxial compression[J]. 2016, 37(4): 1013-1022.
DOI：

GU Lu, WANG Xue0-bin, DU Ya-zhi, et al. Experimental studies of rotation angles of principal strain axes for wet sandy soil specimens under uniaxial compression[J]. 2016, 37(4): 1013-1022. DOI： 10.16285/j.rsm.2016.04.014.

摘要

利用自主开发的基于粒子群优化的数字图像相关方法，获得了单轴压缩湿砂土试样观测平面内主应变轴偏转角的时空分布规律。采用双三次样条插值方法，获取了任意位置的主应变轴偏转角，分析了土样将来出现剪切带位置、剪切带的中心及其尖端附近和剪切带外的主应变轴偏转角随纵向应变的演变规律。研究发现，随着纵向应变的增加，在土样观测平面内，主应变轴偏转角的范围由分散逐渐变得稳定，大部分区域最终分布在-10°～10°之间。当出现较清晰的剪切带以后（硬化阶段后期），剪切带内不同位置处主应变轴偏转角基本趋于恒定或稍有下降，大致稳定在-5°～5°之间，这与剪切带外的点的主应变轴偏转角均处于发展之中不同；而在剪切带尖端附近的点，主应变轴偏转角随纵向应变的演变规律比较复杂。

Abstract

Using the self-developed digital image correlation method based on the particle swarm optimization algorithm

the spatiotemporal distributions of rotation angles of principal strain axes for wet sandy soil specimens are investigated under uniaxial compression. Using the bicubic spline interpolation

the rotation angles of principal strain axes at any positions are obtained to study the evolution of the rotation angles of principal strain axes with the longitudinal strains before the occurrence of a shear band

at its center

in the vicinity and at both sides of the band. It is found that with the increase of longitudinal strain

the rotation angles of principal strain axes change from a scattered distribution to a stable one; and at last

its range in most regions is -10°-10°. After the occurrence of an apparent shear band at the late stage of strain-hardening

at the center of the band

the rotation angles of principal strain axes tend to be stable or descend slightly

within a range of -5°-5°

while those at both sides of the band still increase. At tip of the band

the evolution of the rotation angles of principal strain axes is complex.

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