Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation

Table 3

Statistical table of blasting fragmentation screening.

The number	Fragmentation grade/mm	<9.5	9.5∼16	16∼19	19∼26.5	26.5∼31.5	31.5∼37.5	37.5∼53	>53
S-1	Quality/kg	0.62	0.39	0.32	0.39	0.32	0.22	0.80	0.81
	Cumulative quality/kg	0.62	1.01	1.33	1.72	2.04	2.26	3.06	3.87
	Quality percentage/%	16.0	10.1	8.4	10.2	8.3	5.7	20.6	20.7
	Cumulative quality percentage/%	16.0	26.1	34.5	44.7	53.0	58.7	79.3	100
S-2	Quality/kg	0.72	0.53	0.50	0.48	0.40	0.32	0.48	0.55
	Cumulative quality/kg	0.72	1.25	1.75	2.23	2.63	2.95	3.43	3.98
	Quality percentage/%	18.0	13.3	12.5	12.0	10.1	8.2	12.0	13.9
	Cumulative quality percentage/%	18.0	31.3	43.8	55.8	65.9	74.1	86.1	100
S-3	Quality/kg	0.55	0.52	0.51	0.49	0.31	0.26	0.46	0.57
	Cumulative quality/kg	0.55	1.07	1.58	2.07	2.38	2.64	3.1	3.67
	Quality percentage/%	15.0	14.3	14	13.3	8.5	7.0	12.5	15.4
	Cumulative quality percentage/%	15.0	29.3	43.3	56.6	65.1	72.1	84.6	100
S-4	Quality/kg	0.52	0.15	0.20	0.23	0.31	0.21	1.02	1.07
	Cumulative quality/kg	0.52	0.67	0.87	1.10	1.41	1.62	2.64	3.71
	Quality percentage/%	14	4.1	5.4	6.2	8.3	5.7	27.6	28.7
	Cumulative quality percentage/%	14	18.1	23.5	29.7	38.0	43.7	71.3	100