Data from: Research on radial stress distribution and gas seepage characteristics of the coal body around boreholes

Addressing the complex issues of elastic-plastic deformation in the coal
body around boreholes (CBAB) and gas seepage during gas extraction, this
study quantitatively reveals the radial stress distribution
characteristics of CBAB based on Mohr-Coulomb strength criteria through
postdrilling stress analysis of the surrounding coal body. Radial seepage
experiments were simulated, and combined with experimental results, the
gas seepage characteristics of CBAB were systematically analyzed,
validating the permeability evolution model. The findings indicate that
CBAB radially divides into a decompression zone, a stress concentration
zone, and a native rock stress zone. Vertical stress first peaks then
decays, while horizontal stress continuously decreases. Radial segmented
permeability experiments demonstrate that CBAB permeability initially
drops sharply due to pore compaction, then undergoes a gradual change
dominated by microfractures, eventually stabilizing under rigid matrix
control. The calculated results of the CBAB radial permeability evolution
model exhibit an R2 > 0.95 correlation with experimental flow data.