Mechanism and Application of Blasting Technology Using Phase-Difference Vibration Mitigation on Adjacent Railway Tunnel

Table 1

Blasting parameters.

(1) Conventional blasting parameters
No.	Blasthole type	Period	Initiation time (ms)	Number of blastholes	Charging coefficient	Quality per hole (kg)	Total quality (kg)
1	Cut holes	1	0	6	0.55	0.5	3.0
2	Auxiliary holes	3	50	15	0.5	0.5	7.5
3	Auxiliary holes	5	110	16	0.5	0.5	8.0
4	Bottom holes	6	150	6	0.25	0.2	1.2
5	Bottom holes	6	150	9	0.25	0.2	1.8
6	Periphery holes	7	200	27	0.25	0.2	5.4
7	Total			79			26.9
(2) shock absorption blasting parameters
1	Cut holes	1	0	3	0.55	0.5	1.5
2	Cut holes	2	5	3	0.55	0.5	1.5
3	Auxiliary holes	3	22	8	0.5	0.5	4.0
4	Auxiliary holes	4	39	7	0.5	0.5	3.5
5	Auxiliary holes	5	56	8	0.5	0.5	4.0
6	Auxiliary holes	6	73	8	0.5	0.5	4
7	Bottom holes	5	56	3	0.25	0.2	0.6
8	Bottom holes	6	73	3	0.25	0.2	0.6
9	Bottom holes	7	90	5	0.25	0.2	1.0
10	Bottom holes	8	107	4	0.25	0.2	0.8
11	Periphery holes	7	90	14	0.25	0.2	2.8
12	Periphery holes	8	107	13	0.25	0.2	2.6
13	Total			79			26.9