Research on Fracture and Energy Evolution of Rock Containing Natural Fractures under Cyclic Loading Condition

Table 1

Statistical analysis of the natural fracture volume within the marble samples.

Sample ID	Total natural fracture volume ratio	Opening-mode fractures and sealed with calcite	Closing-mode fracture with quartz vein	Filling-mode fracture with pyrite bands
	(%)	(%)	(%)	(%)
NFM3	2.27	0.51	1.18	0.58
NFM4	1.53	0.81	0.11	0.61
NFM1	1.03	0.62	0.05	0.36
NFM13	0.68	0.09	0.24	0.35