单轴压缩湿砂样局部及整体体积应变的数字图像相关方法观测

王学滨; 杜亚志; 潘一山

doi:10.11779/CJGE201409011

单轴压缩湿砂样局部及整体体积应变的数字图像相关方法观测 English Version

王学滨^{1, 2, 3},
杜亚志¹,
潘一山¹

1. 辽宁工程技术大学力学与工程学院,辽宁阜新 123000;
2. 中国矿业大学（北京）力学与建筑工程学院,北京 100083;
3. 辽宁工程技术大学计算力学研究所,辽宁阜新 123000

基金项目: 国家自然科学基金项目（51374122）; 高等学校博士点专项科研基金联合资助项目（20132121110006）

详细信息

作者简介:
王学滨（1975- ）,男,黑龙江双鸭山人,博士,教授,博士生导师,主要从事岩土材料的变形、破坏及稳定性研究。E-mail: wxbbb@263.net。

中图分类号: TU454
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出版历程
- 收稿日期: 2014-01-09
- 发布日期: 2014-09-21

Measurements of local and global volumetric strains for wet sand specimens under uniaxial compression using digital image correlation method

1. College of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China;
2. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;
3. Institute of Computational Mechanics, Liaoning Technical University, Fuxin 123000, China

摘要

摘要: 确定体积应变局部化区域对于涉及孔隙流体的地质灾害研究具有重要意义。体积应变局部化区域可能比最大剪切应变局部化区域更接近于孕灾地点。在单轴压缩位移控制加载条件下,测试了3个湿砂样（含水率为12.7%~17.1%）的应力-纵向应变曲线,在微裂纹出现之前及稍后,利用自主开发的基于粒子群优化的数字图像相关（DIC）方法计算了砂样的局部体积应变的变化规律。研究发现,在加载过程中,局部体积应变由均匀分布（近似线性阶段）向不均匀分布（硬化阶段）转变,直至出现局部体积应变局部化现象。在剪切带切向上,和最大剪切应变的相对均匀分布相比,局部体积应变的分布具有多峰性,这应与周期性的微裂纹出现有关。在微裂纹出现稍前,剪切带的变形是以膨胀为主,剪切带已较为显著,带内的最大剪切应变和局部体积应变分别比带外多2倍和4倍,但在此前,剪切带的膨胀和收缩现象共存。计算了所有测点所围区域的整体体积应变随纵向应变的演变规律。基于DIC方法的整体体积应变计算方法的优越性在于：具有亚像素精度,考虑了应变二阶量的影响。
- 湿砂样 /
- 膨胀 /
- 剪切带 /
- 体积应变 /
- 数字图像相关方法 /
- 地质灾害
Abstract: Determination of volumetric strain localization regions in shear bands is significant for studies on geological hazards related to pore fluids. Possibly, compared with those of the maximum shear strain localization, the positions of the volumetric strain localization are closer to sites for the source of hazards. Stress-longitudinal strain curves of three wet sand specimens (water contents=12.7%~17.1%) under uniaxial displacement-controlled loading are measured. Using a developed digital image correlation (DIC) method based on the particle swarm optimization algorithm, the distribution of local volumetric strain in sand specimens is calculated before and slightly beyond microcracks are initiated. It is found that as deformation proceeds, the uniform distribution of the local volumetric strain at the approximately linear stage is changed to the nonuniform one at the strain-hardening stage until the local volumetric strain localization occurs. In the tangential direction of a shear band, compared with the relatively uniform distribution of the maximum shear strain, the distribution of the local volumetric strain exhibits several peaks, which is related to the periodic occurrence of microcracks. When microcracks will be initiated, the deformation in the shear band is basically dilatational; the shear bands are more apparent; and the maximum shear strain and local volumetric strain in the shear band are two and four times larger than those outside the band, respectively. However, at the earlier stage, the dilatational and contractive regions are
- wet sand specimen /
- dilatation /
- shear band /
- volumetric strain /
- digital image correlation method /
- geological hazard

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参考文献(17)

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