PIV测量技术在锚板板周土体变形场研究中的应用  

Application of PIV Technique to Research on Sand Deformation Around Plate Anchors

作　　者：张昕[1,2] 乐金朝[1] 刘汉东[2] 

机构地区：[1]郑州大学水利与环境学院,河南郑州450001 [2]华北水利水电学院资源与环境学院,河南郑州450011

出　　处：《郑州大学学报（工学版）》2011年第5期20-23,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：教育部留学回国人员启动基金资助项目;河南省重点科技攻关计划项目(112102310602)

摘　　要：采用粒子图像测速技术对锚板在上拔过程中板周土体的变形进行了研究.首先将图像进行网格划分,利用相关联匹配技术得到了锚板周围土体在峰值点处的位移场,锚板在上拔过程中,锚板上部的土体位移中心部分大,周边小,最大位移与实测位移一致.通过位移场计算得到剪切应变场,锚板两侧形成对称并贯通到地面的剪切带,该剪切带与竖直方向的夹角约为18°,与实际结果一致.测量结果表明:粒子图像测速技术能较好地测定锚板在上拔过程中任意点在任意时刻的位移,从而得到锚板周边的剪切带以及剪切应变的大小分布,对量化分析锚板的变形破坏机理具有重要的研究意义.The research on the sand deformation around an uplifting anchor is conducted based on the PIV.The images are divided into small patches.The digital cross-correlation method is used to search for the best matching between these small patches and the sand displacement field around plate anchor at peak point is obtained.The sand displacement is characterized as large movement above the anchor but small movement at the sides of the anchor.The measured maximum sand displacement by PIV is consistent with the anchor displacement measured by LVDT.The shear strain field shows that the symmetric shear zones tangent with the anchor side and inclining upward to the surface are shaped.The angle of the shear bands with the vertical is about 18°,which is consistent with other researchers＇ results.The results show that PIV measurement can better measure the sand displacement around the plate anchor during anchor uplifting at any time.The shear bands distribution and shear strain can also be deduced.These results are of great significance for the quantitative analysis of deformation and failure of anchor plate.

关 键 词：锚板 变形场 粒子图像测速技术 

分 类 号：TU476[建筑科学—结构工程]