Experimental Study on Mechanical Properties of Prefabricated Single-Cracked Red Sandstone under Uniaxial Compression

Table 4

The damage statistics of the specimens with different crack dip angles.

Crack dip angle (°)	Peak strength (MPa)	Peak strain	Number of microcracks	Total number of bonds	Number of the broken bonds	Mesodamage variable D
0	46.54	0.97	3300	56754	491	0.0087
15	52.89	1.06	3379	56741	909	0.016
30	52.63	1.08	3609	56750	994	0.018
45	56.81	1.18	4865	56745	2033	0.036
60	65.80	1.27	5589	57128	2920	0.051
75	70.63	1.31	5985	56750	2842	0.050
90	72.07	1.33	7352	56741	3780	0.067
Intact	78.73	1.81	8822	56969	4937	0.087