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August 15, 2026Fractal and FractionalOpen Access

Fractal Characterization of Stress–Energy Response and Progressive Damage in Coal–Rock Mass Before and After Pre-Splitting Blasting of Hard Roof: From Laboratory Fragmentation to Field Fractures

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Authors

JDJiaxin DangJLJianwei LiMTMin Tu

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Overview

Experimental and numerical study reveals stress redistribution and fracture propagation during hard roof pre-splitting blasting, highlighting fractal metrics for optimized deep coal mine control.

Key Points

  • To investigate the fractal evolution of stress–energy response and progressive damage in coal–rock mass under mechanical loading and pre-splitting blasting disturbances to optimize hard roof control in deep mines.
  • Combined theoretical analysis, numerical simulations, and laboratory loading experiments to evaluate fragment size distributions and energy accumulation.
  • Conducted field trials using segmented fan-shaped borehole pre-splitting blasting in a 7–23.5 m sandstone roof at Zhangji Coal Mine (9 coal seam), analyzing fracture propagation via borehole imaging.
  • The fractal dimension D of fragment size distribution increased monotonically with loading rate, accompanied by a fine-particle proportion increase from 48.5% to 52.3%.
  • Pre-splitting blasting successfully shifted peak stress concentrations away from the working face, producing a fracture network dominated by shear fractures with secondary tensile fractures.
  • Fractal dimensions calculated from borehole images quantitatively confirmed effective fracture network propagation and hard roof destressing in field trials.

Cite This Study

Dang et al. (2026) studied this question.

synapsesocial.com/papers/6a8019fe75c2e31742c86529https://doi.org/10.3390/fractalfract10080551
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