Table 2 Values of joint correction coefficient K.

From: Calculation of hole spacing and surrounding rock damage analysis under the action of in situ stress and joints

Joint inclination, K

Confining pressure

0 MPa

0.75 MPa

1.5 MPa

3.0 MPa

Single-joint test block

30°

0.490

0.680

0.796

0.640

60°

0.440

0.670

0.803

0.650

90°

0.409

0.726

0.826

0.676

Double-joint test block

30°

0.425

0.571

0.681

0.565

60°

0.397

0.587

0.711

0.636

90°

0.386

0.648

0.719

0.654

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