Characterization of 3D Displacement and Stress Fields in Coal Based on CT Scans

Qi Li, Zhen Li, Peng Li, Ruikai Pan and Qingqing Zhang
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Qi Li: Department of Mining Engineering, Shanxi Institute of Energy, Jinzhong 030600, China
Zhen Li: College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Peng Li: Department of Mining Engineering, Shanxi Institute of Energy, Jinzhong 030600, China
Ruikai Pan: Department of Mining Engineering, Shanxi Institute of Energy, Jinzhong 030600, China
Qingqing Zhang: State Key Laboratory of Coal Mine Safety Technology, CCTEG Shenyang Research Institute, Fushun 113000, China

Mathematics, 2022, vol. 10, issue 14, 1-16

Abstract: Computed tomography (CT) scans were performed on samples of an outburst-prone coal seam at different loading stages. The area and roundness of the CT images were used to quantify the degree of the coal macroscopic deformation under different loads. A spatial matching algorithm was used to calculate the three-dimensional (3D) displacement fields of different regions of interest (ROIs, containing primary fractures, minerals, and only coal) under different loads. The presence of fractures and minerals were found to promote and inhibit displacement, respectively, and the 3D displacement field data followed a normal distribution. A meshfree numerical simulation was used to determine the 3D maximum principal stress, shear stress and displacement fields under different loads. The following results were obtained: fractures and minerals significantly affect the stress state and displacement field distribution features, the maximum principal stresses and shear stresses in different matrices differ significantly, and the presence of minerals and fractures induce a prevalent shear stress in coal and make coal prone to stress concentration.

Keywords: CT scan; 3D displacement field; 3D stress field; meshfree numerical simulation (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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