Study on Mechanical Model for Postpeak Shear Behavior of Rock Joints Based on Degradation Characteristics of the 3D Morphology

Table 4

Fractal dimension under different and u.

u (mm)	(MPa)
	Upper surfaces						Lower surfaces
	0.1	2.5	5.0	7.5	10.0	12.5	0.1	2.5	5.0	7.5	10.0	12.5
0	1.871	1.876	1.785	1.704	1.843	1.894	1.836	1.905	1.901	1.788	1.773	1.846
2.5	1.820	1.815	1.751	1.649	1.798	1.594	1.811	1.841	1.893	1.690	1.733	1.719
5.0	1.800	1.794	1.720	1.570	1.578	—	1.758	1.765	1.823	1.661	1.590	—
7.5	1.749	1.641	1.597	1.526	1.479	1.468	1.738	1.709	1.815	1.536	1.551	1.671
10.0	1.676	1.605	1.524	1.513	1.484	—	1.694	1.631	1.599	—	—	—
12.5	1.621	1.569	—	—	—	—	1.663	1.545	—	—	—	—