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June 13, 2026Petroleum Science10 citationsOpen Access

Effects of Initial Damage Degrees on Crack Propagation and Permeability in Coal Under Cyclic Loading

Effects of initial damage degrees on crack propagation and permeability characteristics of coal subjected to cyclic loading

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Authors

QRQican RanYLYunpei LiangCYChun-Feng Ye

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Overview

Randomized trial investigates how initial damage degrees affect crack growth and permeability in coal, suggesting important engineering implications.

Key Points

  • This research aims to understand how varying initial damage degrees in coal influence crack propagation and permeability when subjected to cyclic stress.
  • Cyclic loading and permeability tests were conducted on coal samples with varying initial damage degrees.
  • Acoustic emission and computed tomography techniques were used to assess crack propagation and permeability changes.
  • Analyses included evaluation of strength, deformation modulus, and energy dissipated during loading.
  • Higher initial damage degrees led to a significant decrease in peak strength and deformation modulus of coal samples.
  • Permeability generally decreased with stress, but specimens with high initial damage degrees showed transient permeability recovery at high stress levels.
  • CT analysis revealed an increase in crack volume percentage from 2.821% to 8.968% with rising initial damage degrees, correlating with permeability changes.

Cite This Study

Ran et al. (2026) studied this question.

synapsesocial.com/papers/6a2cf5d7faef96ed7f057b13https://doi.org/10.1016/j.petsci.2026.06.011
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