Research Article

Study of SCA-Induced Rock Crack Propagation under Different Stress Conditions Using a Modified Cohesive Element Method

Table 3

The P-l linear fit equations under the conditions of σ1 = σ3.

Confining stress (MPa)P-l linear fitting equationsAdjusted R2Expansion pressure of crack initiation, P0 (MPa)

5l = 11.908P − 197.954290.9401216.6236
7.5l = 7.09694P − 144.02860.9567320.2945
10l = 5.33562P − 129.773320.9677824.3221
12.5l = 4.12966P − 122.092840.9681229.5647
15l = 3.52583P − 122.949850.9783134.8712
17.5l = 2.71927P − 99.534060.966736.6032
20l = 2.18073P − 82.531010.9772837.8456