熔融石英粒径对透明土位移测量精度的影响

发布时间：2018-06-20 12:39

本文选题：透明土 + 熔融石英　；参考：《岩土力学》2017年02期

【摘要】：利用透明土技术和激光散斑图像结合数字图像相关方法(DIC方法)测量土体内部的位移场,是研究土力学问题的一种新方法。通过试验研究不同粒径范围的熔融石英颗粒(中细砂0.1~0.3 mm、中砂0.3~0.5 mm、粗砂0.5~2 mm、细砾2~5 mm),揭示粒径对激光散斑图像质量、DIC查询窗口和位移场测量精度的影响。结果表明,不同粒径的熔融石英透明土模型产生的散斑场图像、灰度直方图明显不同;相同入射激光下,小粒径比大粒径模型获得更好质量的散斑图像。位移误差直方图显示,位移误差依赖于查询窗口尺寸和颗粒大小。通过平均灰度梯度调整查询窗口,不同粒径的透明土模型可以给出彼此相当的测量精度。数字和物理平移试验显示,由小粒径石英颗粒配置的透明土模型能够得到更高的测量精度。
[Abstract]:It is a new method to study soil mechanics problem by using transparent soil technique and laser speckle image combined with digital image correlation method (DIC method) to measure the displacement field of soil. The effect of particle size on laser speckle image quality and accuracy of DIC query window and displacement field were investigated by means of experiments on fused quartz particles with different particle sizes (0.1 mm fine sand, 0.3 mm fine sand, 0.5 mm coarse sand and 5 mm fine gravel). The results show that the speckle field images produced by the fused quartz transparent soil model with different particle sizes are obviously different from the gray histogram, and the speckle images with small particle size are better than those with large particle size models under the same incident laser. The displacement error histogram shows that the displacement error depends on the size of the query window and particle size. By adjusting the query window with average grayscale gradient, the model of transparent soil with different particle size can give each other equivalent measurement precision. The digital and physical translation tests show that the model of transparent soil with small size quartz particles can obtain higher measurement accuracy.
【作者单位】：大连理工大学工程力学系;大连理工大学工业装备与结构分析国家重点实验室;
【基金】：国家自然科学基金(No.51308091,No.11672066) 中央高校基本科研业务费专项项目(No.DUT15QY48)~~
【分类号】：TU411

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