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Gray Characteristics Analysis of Strain Field of Coal and Rock Bodies Around Boreholes During Progressive Damage Based on Digital Image

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Abstract

Gas extraction borehole is one of the important means to solve the mine gas disaster. However, the deformation and damage of coal and rock bodies around borehole will significantly affect the gas extraction effect. The main purpose of this research is to explore the effect of the strength of sealing grouting material on the deformation and damage characteristics of coal and rock bodies around borehole. For this purpose, the digital image correlation (DIC) experimental platform for the deformation and damage of coal and rock bodies was used to carry out the surface deformation observation test of coal and rock bodies around boreholes during progressive damage. The Matlab was used to convert digital images into gray images and calculate the corresponding gray histograms. Three gray characteristic parameters including mean, standard deviation, and entropy were used to quantify the influence of the strength of the grouting material on the gray evolution law of the strain field of the coal and rock bodies around boreholes during progressive damage that support the following results: (1) As the strength of the grouting material increased, the compressive strength of the specimens tended to rise, and the width of the cracks on the upper and lower sides around boreholes decreased significantly. (2) The gray clouds of strain field can be used to characterize the damage state and crack propagation characteristics of coal and rock bodies around boreholes. During progressive damage, the gray frequency of the surface strain field of the coal and rock bodies around boreholes shows a trend of “increasing and then decreasing”, and the shape of gray histogram changes from “pyknic” to “lanky”. The variation of gray frequency and the gray histogram decreases with the strength of the grouting material increases. (3) The evolution process of gray characteristic parameters further reflects the crack propagation law of coal and rock bodies around boreholes during progressive damage. According to the stress threshold values, the evolution process of gray characteristic parameters can be divided into five stages, in which the appearance of mutation segment of gray characteristic parameters is closely related to crack initiation and propagation. By studying the gray images and gray characteristic parameters of the coal and rock bodies around boreholes before and after grouting sealing during progressive damage, the crack propagation law was analyzed from the perspective of digital images, providing a scientific basis to further optimize the grouting sealing engineering of gas extraction boreholes.

Highlights

  • Strain field clouds obtained based on digital image correlation technique can more realistically reflect the deformation and damage characteristics.

  • The gray clouds and gray histogram can be used to characterized the damage state and crack propagation characteristics.

  • The evolution process of gray characteristic parameters further reflects the crack propagation law.

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Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This work was supported by the National Natural Science Foundations of China, the mechanism of gas seepage induced by the fracture expansion in the “U-shaped zone” of the double-prevention drillhole (Grant No. 52104216); Crush evolution and water–gas coupled permeability mechanism of coal body around drainage drilling (Grant No. 2021JM-390); Subcritical expansion mechanism of cracks around the gas drainage drilling with the stress corrosion (Grant No. 2020M683680XB).

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Authors and Affiliations

  1. College of Safety Science and Engineering, Xi’an University of Science and Technology, 58, Yanta Mid. Rd., Xi’an, 710054, Shaanxi, People’s Republic of China

    Xiang Ji, Tianjun Zhang, Bing Ji, Hongyu Pan & Bingnan Ji

  2. College of Energy, Xi’an University of Science and Technology, Xi’an, 710054, China

    Lei Zhang, Mingkun Pang & Hongyu Pan

  3. Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi’an, China

    Xiang Ji, Tianjun Zhang, Bing Ji, Lei Zhang, Mingkun Pang, Hongyu Pan & Bingnan Ji

Authors
  1. Xiang Ji
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  2. Tianjun Zhang
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  3. Bing Ji
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  4. Lei Zhang
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  5. Mingkun Pang
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  6. Hongyu Pan
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  7. Bingnan Ji
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Contributions

The main research idea and manuscript preparation were contributed by XJ; TZ contributed on the manuscript preparation and performed the correlative experiment. BJ gave several suggestions from the industrial perspectives. LZ, MP, HP, and BJ assisted on finalizing research work and manuscript. Finally, thanks to the test platform provided by Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, the test was successfully completed and the data were obtained.

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Correspondence to Tianjun Zhang or Hongyu Pan.

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Ji, X., Zhang, T., Ji, B. et al. Gray Characteristics Analysis of Strain Field of Coal and Rock Bodies Around Boreholes During Progressive Damage Based on Digital Image. Rock Mech Rock Eng 56, 5607–5620 (2023). https://doi.org/10.1007/s00603-023-03351-x

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