Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (11): 3255-3264.doi: 10.13229/j.cnki.jdxbgxb.20230018

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Full-field deformation measurement on unconfined specimen based on 3D-DIC and multi-camera photogrammetry

Lin LI(),Ke-ren SHEN,Shi-yu HE,Zhen-wang CHEN   

  1. College of Civil Engineering，Nanjing Forestry University，Nanjing 210037，China
  • Received:2023-01-15 Online:2024-11-01 Published:2025-04-24

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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

CLC Number: 

  • TU411

Fig.1

Layout of marking points"

Fig.2

Texture setup"

Fig.3

Steel cylinder and system layout"

Fig.4

Photogrammetric analysis results"

Table 1

Point cloud generated six camera pairs"

点云Cam1-2Cam2-3Cam3-4Cam4-5Cam5-6Cam6-1
行250250250250250250
列624647564646
总数15 50011 50011 75014 00011 50011 500

Fig.5

3D point cloud generated in the same area before and after loading by camera pair Cam3-4"

Fig.6

3D point clouds and reconstructed specimen surface"

Fig.7

3D reconstruction of soil and sand samples"

Fig.8

Axial displacement distribution"

Fig.9

Radial strain distribution"

Fig. 10

Axial strain distribution"

Fig.11

Axial strain and volume variations"

Fig.12

Local deformation analysis results"

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