Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (9): 3170-3180.doi: 10.16285/j.rsm.2019.6973

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Study of visualization measurement system of spatial deformation based on transparent soil and three-dimensional reconstruction technology

ZHAO Hong-hua1, 2, LIU Cong3, 4, TANG Xiao-wei3, 4, WEI Huan-wei5, ZHU Feng3, 4   

  1. 1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, Liaoning 116024, China 2. Department of Engineering Mechanics, Dalian University of Technology, Dalian, Liaoning 116024, China 3. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China 4. Institute of Geotechnical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China 5. School of Civil Engineering, Shandong Jianzhu University, Jinan, Shandong 250100, China
  • Online:2020-09-11 Published:2021-02-08
  • Contact: LIU Cong, male, born in 1990, PhD candidate, mainly engaged in research on the development of transparent soil testing technology and large deformation discrete element simulation. E-mail: E-mail:
  • About author:ZHAO Hong-hua, female, born in 1977, PhD, Associate Professor, PhD supervisor, mainly engaged in research on transparent soil testing technology, unsaturated soil and pile foundation engineering.
  • Supported by:
    the National Natural Science Foundation of China(11672066)

Abstract: In the conventional visualization model test, the displacement and deformation in the two-dimensional observation window can be observed, but the out-of-plane displacement of the three-dimensional(3D) problem and the 3D deformation field cannot be obtained. Therefore, based on the transparent soil model test, a set of automatic tomographic scanning test device is independently developed in this study. The synchronous motion of the camera with the laser device is controlled by a high-precision electric linear platform to obtain a series of two-dimensional images. The improved image deformation measurement method is used for image post-processing. On this basis, a corresponding 3D reconstruction volume rendering program is coded to construct the 3D displacement field after deformation. In order to verify the feasibility of the visualization measurement system of spatial deformation, static pressure tests of square foundation and circular foundation in transparent soil are carried out. The test results show that the contour of the 3D vertical displacement and horizontal displacement after reconstruction are consistent with the theoretical prediction results and with those previously presented in the literature. The 3D vector displacement field can directly show the movement of soil mass at different positions, which eliminate that the 2D observation technique cannot reflect the out-of-plane displacement. This study not only further reveals the spatial deformation problem in static pressure test, but also provides a feasible method for realizing the observation of spatial deformation in the physical model test.

Key words: transparent soil, tomographic scanning, 3D reconstruction, 3D displacement field, static pressure tests