Permeability of the composite coal in the grouting section around the CBM drainage borehole in the coal mine.

Sci Rep · 2025 · PMC12340156 · PMID 40789899

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a decreasing trendno p-value reported

5 (b), for graded specimens ( h 1 = 0), the porosity increases with higher Talbot index n , whereas for composite specimens, the porosity shows a decreasing trend as the Talbot index n 2 increased.

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