Table 8 Water action damage variable Dn of coal samples as a function of the number of immersions.

From: Study on the strength deterioration characteristic and damage model of coal pillar dams with repeated water immersion in underground reservoirs

Confining pressure

Dn as a function of the number of immersions

R2

4 MPa

y = − 0.601*exp(− x/1.209) + 0.608

0.9831

8 MPa

y = − 0.639*exp(− x/2.248) + 0.647

0.9920

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