Table 2 Parametric values and correlation coefficients for the coupling of confining pressure and hydraulic pressure with permeability.

From: Study on the mechanical properties and permeability evolution of sandstone under cyclic loading and unloading stress-seepage coupling

Cycle loading and unloading count

a

b

c

d

R2

1

61.0121

− 0.2912

0.9854

114.9453

0.9581

2

56.6790

− 0.2796

0.9759

113.9435

0.9418

3

151.1219

− 0.9400

0.8961

132.6401

0.9338

4

50.1340

0.3869

0.9009

123.5700

0.9031

5

443.5500

− 0.0813

0.2975

1028.3875

0.7043

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