摘要
针对颗粒材料剪切变形的细观尺度研究,介绍了基于密度匹配原理的颗粒实现完全移除底部摩擦力的光弹试验技术。通过对密实度为82%的光弹颗粒系统进行直剪变形研究,研究结果表明颗粒系统在直剪试验过程中,力链的主方向即主应力方向沿着剪切室短对角线方向发展,并贯穿于整个颗粒系统后在剪切室的边界处达到应力平衡;而颗粒系统中各颗粒的位移场在归一化后表现出很好沿剪切室中轴的对称性。
The photoelasticity technique can remove the particles basal friction by using density matched.It can be used to study the meso-deformation characteristics of the granular stuff.In this paper,the simple shear photoelasitc experiment is conducted on the granular system with 82%packing fraction.The research results indicate that the direction of force chain(or principle stress)is the relatively short diagonal line direction of the shear box,and cross over the whole granular system.The force chain is disappeared on the boundary of the shear box to get the balancing of stresses status.The normalized deformation vector of the granular materials shows symmetrical in the shear box axial.
出处
《工程地质学报》
CSCD
北大核心
2014年第5期851-854,共4页
Journal of Engineering Geology
基金
江苏省自然科学基金青年基金(BK20140845)资助
关键词
光弹测试技术
颗粒材料
细观变形
密度匹配
Photoelasticity technique,Granular materials,Meso-deformation,Density matched
