Study and Application of Rock Breaking Mechanism of Concentrated Water Hydraulic Smooth Blasting in Broken Sand-Stone Geological Conditions

Table 6

Detailed hole layout parameters.

Gun hole name	Detonator section times	Number of gun holes	Hole deep (m)	Row spacing (cm)	Hole spacing (cm)	Angle (°)	Charging factor	Single hole loading capacity (kg)
Bottom trenching	1	4	1.92	425	80	45	0.56	1.5
	3	8	3.7	585	40	52	0.64	3
	5	4	3.7	745	80	62	0.60	2.4
	7	4	3.7	905	80	78	0.47	1.8
Upper trenching	1	4	1.92	425	80	45	0.56	1.5
	3	6	3.7	585	50	52	0.64	3
	5	4	3.7	745	80	62	0.60	3
	7	4	3.7	905	80	78	0.47	1.8
Auxiliary hole	7	3	3.7	80	100	90	0.57	2.1
	9	3	3.7	60	130	90	0.49	1.8
	11	7	3.7	60	120	90	0.49	1.8
	13	17	3.7	50	90	90	0.41	1.5
Peripheral holes	15	37	3.7	60	70	88	0.84	1.2
Base plate hole	17	11	3.7	85	130	90	0.49	1.8