• 应用地球物理学Ⅱ（海洋、工程、环境、仪器等） •

### 单轴压缩土样剪切带内、外主应变轴偏转角统计分析

1. 1. 辽宁工程技术大学计算力学研究所,辽宁阜新 123000
2. 辽宁工程技术大学力学与工程学院,辽宁阜新 123000
3. 辽宁工程技术大学机械工程学院,辽宁阜新 123000;
• 收稿日期:2018-04-16 修回日期:2018-10-23 出版日期:2019-02-20 发布日期:2019-04-15
• 作者简介:王学滨,男,1975年生,博士,教授,主要从事工程材料变形、破坏及稳定性方面的研究工作.(E-mail: wxbbb@263.net)
• 基金资助:
国家自然科学基金项目和辽宁省百千万人才工程项目资助.(51574144)

### Statistical analyses of principal strain axis rotational angles in shear bands and outside for clay specimens in uniaxial compression

WANG Xue-bin1,2,FENG Wei-wu2,CAO Si-wen2,YANG Mei3,HOU Wen-teng2,ZHANG Bo-wen2

1. 1. Institute of Computational Mechanics, Liaoning Technical University, Liaoning Fuxin 123000, China
2. College of Mechanics and Engineering, Liaoning Technical University, Liaoning Fuxin 123000, China
3. School of Mechanical Engineering, Liaoning Technical University, Liaoning Fuxin 123000, China
• Received:2018-04-16 Revised:2018-10-23 Online:2019-02-20 Published:2019-04-15

Abstract:

Statistical analyses of maximum shear strains obtained by use of the digital image correlation method and principal strain axis rotational angles are conducted for low liquid limit clay specimens in uniaxial compression. Some curved monitored lines are arranged according to higher maximum shear strain positions in apparent shear bands at higher longitudinal strains, and some straight monitored lines are arranged at both sides of curved monitored lines. The following results are found. With an increase of the longitudinal strain, the percentage of positive values (anticlockwise rotation) of principal strain axis rotational angles shows an increasing or invariable trend for straight monitored lines arranged by sinistral shear bands, while it shows a decreasing trend for curved monitored lines arranged by dextral shear bands. The percentage of positive values of principal strain axis rotational angles shows a decreasing trend for straight monitored lines arranged by sinistral shear bands, while it shows an increasing trend for curved monitored lines arranged by dextral shear bands. When microcracks just occur, most of principal strain axis rotational angles for dextral shear bands are negative (clockwise rotation), most of principal strain axis rotational angles for sinistral shear bands are positive, and principal strain axis rotational angles near shear bands are usually opposite to those in shear bands. Positions of higher and lower values of principal strain axis rotational angles are consistent with or adjacent to those of higher or lower of maximum shear strains. Once an apparent shear band occurs, current rotational directions of principal strain axes outside the shear band are usually opposite to total rotational directions of principal strain axes in the shear band.