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Visualization of the complex structure and stress field inside rock by means of 3D printing technology

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  • Energy Sources
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Chinese Science Bulletin

Abstract

Accurate characterization and visualization of the complex inner structure and stress distribution of rocks are of vital significance to solve a variety of underground engineering problems. In this paper, we incorporate several advanced technologies, such as CT scan, three-dimensional (3D) reconstruction, and 3D printing, to produce a physical model representing the natural coal rock that inherently contains complex fractures or joints. We employ 3D frozen stress and photoelastic technologies to characterize and visualize the stress distribution within the fractured rock under uniaxial compression. The 3D printed model presents the fracture structures identical to those of the natural prototype. The mechanical properties of the printed model, including uniaxial compression strength, elastic modulus, and Poisson’s ratio, are testified to be similar to those of the prototype coal rock. The frozen stress and photoelastic tests show that the location of stress concentration and the stress gradient around the discontinuous fractures are in good agreement with the numerical predictions of the real coal sample. The proposed method appears to be capable of visually quantifying the influences of discontinuous, irregular fractures on the strength, deformation, and stress concentration of coal rock. The method of incorporating 3D printing and frozen stress technologies shows a promising way to quantify and visualize the complex fracture structures and their influences on 3D stress distribution of underground rocks, which can also be used to verify numerical simulations.

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Acknowledgements

This work was supported by the National Natural Science Foundation for Distinguished Young Scholars of China (51125017), the National Natural Science Foundation of China (51374213), and the National Basic Research Program of China (2010CB226804, 2011CB201201).

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Authors and Affiliations

  1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining Technology, Beijing, 100083, China

    Yang Ju, Lingtao Mao & Ruidong Peng

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining Technology, Xuzhou, 221116, China

    Yang Ju & Feng Gao

  3. College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu, 610065, China

    Heping Xie

  4. School of Mechanics and Civil Engineering, China University of Mining Technology, Beijing, 100083, China

    Zemin Zheng & Jinbo Lu

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  1. Yang Ju
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  2. Heping Xie
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Correspondence to Yang Ju.

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Ju, Y., Xie, H., Zheng, Z. et al. Visualization of the complex structure and stress field inside rock by means of 3D printing technology. Chin. Sci. Bull. 59, 5354–5365 (2014). https://doi.org/10.1007/s11434-014-0579-9

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  • DOI: https://doi.org/10.1007/s11434-014-0579-9

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