基于DIC的受载砂土颗粒体系的细观参数及运动分析

本文结合DIC方法对砂土体系进行可视化的直剪试验。通过对所采集的数字图片进行预处理,得到利于计算砂土体系细观参数的优质图片,经过图像分割和区域标记,最后利用MATLAB计算得到体系孔隙率、定向率和各向异性率等细观参数。对图像进行DIC计算分析,得到砂土颗粒体系的位移等值线云图,分析了体系内的砂土颗粒在直剪试验中的运动情况,并定性描述了位移突变对体系部分力链传递过程的影响。

On the Meso Parameters and Movement Analysis of a Loaded Sand Particles System Based on DIC

In this paper, based on digital image correlation (DIC) method, visual direct shear test of a sand system is report. Through pretreatment of the collected digital images, high-quality pictures were obtained, which is benefit to meso parameter calculation of sand system. After image segmentation and region labeling, MATLAB calculation was used to calculate the porosity, rate of orientation and anisotropy of the system. Then, DIC calculation and analysis of picture were adopted to obtain the displacement contour cloud chart. The movement of sand particle in direct shear test was analyzed, and the effect of displacement mutation on the force chain transfer process was described qualitatively.