Table 7 Fitted relationship between the acoustic emission cumulative ringing count of coal samples and water immersion times.

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

Confining pressure

Fitting equation

R2

4 MPa

y = 9.457*exp(− x/2.454) + 2.682

0.9976

8 MPa

y = 8.224*exp(− x/2.131) + 5.805

0.9868

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