Image analysis measurement of soil particle movement during a soil–structure interface test
Image analysis measurement of soil particle movement during a soil–structure interface test
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DOI：
10.1016/j.compgeo.2006.05.003
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发表时间：
2006-06
影响因子：
5.3
通讯作者：
Ga Zhang;Dongfang Liang;Jian-Min Zhang
中科院分区：
文献类型：
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作者：
Ga Zhang;Dongfang Liang;Jian-Min Zhang
在这项研究中，我们描述了一种新的微观测量方法，包括设备和分析软件，用于观察和测量土-结构接触面试验过程中的土颗粒运动。土壤颗粒的运动可以记录在高分辨率的数字图像系列上。提出了一种基于相关性的图像分析算法，从图像序列中以亚像素精度测量跟踪点的位移。基于该算法，提出了两种不同的土体运动分析方法，即SMA（soil mass movement analysis）和PTA（soil particle tracking analysis），以满足界面试验中实际测量的不同要求。初步应用验证了所提出的显微测量方法的有效性。实测结果表明，结构附近土体的切向位移与接触面的切向位移有较大差异。据估计，界面厚度约为平均土壤粒度的五倍。结构粗糙度和正应力对结构附近土颗粒的运动有显著影响。
In this study, we describe a new microscopic measuring method, including equipment and analyzing software, for observing and measuring the movement of soil particles during a soil–structure interface test. The movement of soil particles can be recorded onto high-resolution digital image series. A correlation-based image analyzing algorithm is presented that measures the displacements of tracing points at sub-pixel accuracy from the image series. Based on the algorithm, two types of soil movement analysis, namely SMA (soil mass movement analysis) and PTA (soil particle tracking analysis), are proposed to meet the different requirements of practical measurements during an interface test. The proposed microscopic measuring method is validated by preliminary applications. The measurement results show that tangential displacements of the soil near the structure are significantly different from those of the interface. The interface thickness is estimated to be approximately five-times the average soil grain size. Structure roughness and normal stress have a marked effect on the movements of the soil particles near the structure.