基于3D-DIC技术和摄影测量原理的无侧限试样体积与变形测量方法

doi:10.13229/j.cnki.jdxbgxb.20230018

摘要/Abstract

摘要：

提出了一种基于3D-DIC技术和摄影测量原理的方法来实时测量无侧限试样的体积与全局变形，该方法采用试样表面纹理和一个由六台单反相机组成的照片拍摄系统，通过3D-DIC技术分析照片以生成二维点云，利用自编软件GeoTri3D结合摄影测量原理获取二维点云中所有点的三维位置，再对三维点云进行缝合、三角网格划分和端部截断来重建试样的全表面，并计算其体积、全局及局部变形场。基于提出的测量方法开展了一个标准钢柱、砂土和粉土试样的无侧限试验。钢柱试验表明，本文所提出的方法用于无侧限试样体积测量时的误差为0.40%；砂土和粉土试样的无侧限试验结果表明，该方法既可测量总体体积，也可实现任意时刻的全局变形测量；此外，对于试样表面任何兴趣区域，还可通过进一步加大点云密度来获取精细的局部三维变形信息。本文提出的测量方法兼顾了总体体积、全局变形与局部精细变形，弥补了传统方法精度与分辨率低、测量范围小，以及结果单一的缺陷。

关键词: 岩土工程, 3D-DIC, 摄影测量, 全局变形, 无侧限试验, 体积测量

Abstract:

A new method is proposed to measure real-time full-field soil deformation of an unconfined specimen by taking advantage of 3D-DIC technology and multi-camera photogrammetry. This measurement is achieved based on texture on specimen surface and a multi-camera system. Generation of 2D point clouds is made first using 3D-DIC， photogrammetric analysis is then applied to extract the 3D coordinates of each point in the 2D point clouds and follows by point cloud assembly， triangular mesh generation， end cut， surface reconstruction， and volume and deformation calculation by homemade software GeoTri3D. In order to verify the feasibility of the proposed method， unconfined tests were performed on a standard-steel cylinder， sand， and silt specimen. The unconfined compression test results on standard-steel cylinder verified that the proposed method is accurate in volume measurement and different-time and full-field deformation of sand and silt specimens could be captured based on the natural or man-made texture on the specimen surface. In addition， for any area of interest on specimen surface， the measurement resolution can be further increased. The proposed method enables total volume， full-field deformation， and localized deformation measurement at a high resolution， overcomes the limitations associated with the other methods such as low accuracy， resolution， and limited area of interest.

Key words: geotechnical engineering, 3D-DIC, photogrammetry, full-field deformation, unconfined test, volume measurement

中图分类号:

TU411

李林,沈珂任,何世玉,陈镇旺. 基于3D-DIC技术和摄影测量原理的无侧限试样体积与变形测量方法[J]. 吉林大学学报(工学版), 2024, 54(11): 3255-3264.

Lin LI,Ke-ren SHEN,Shi-yu HE,Zhen-wang CHEN. Full-field deformation measurement on unconfined specimen based on 3D-DIC and multi-camera photogrammetry[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(11): 3255-3264.

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点云	Cam_1-2	Cam_2-3	Cam_3-4	Cam_4-5	Cam_5-6	Cam_6-1
行	250	250	250	250	250	250
列	62	46	47	56	46	46
总数	15 500	11 500	11 750	14 000	11 500	11 500