Study on Optimization of Delay Method of Wedge Cut Blasting in Tunnel

Table 6

The peak particle resultant velocity of rock.

Object		Simultaneous	1 ms	VRR	5 ms	VRR	8 ms	VRR	10 ms (%)	VRR	12 ms (%)	VRR	15 ms (%)	VRR	Double hole	VRR
Bottom monitoring point	α1	12	10.1	16%	9.5	21%	10.1	16	9.5	21	11.5	4	10.1	16%	11.5	4%
	α2	11.6	11.7	−1%	10.7	8%	9.7	16	9.5	18	9.2	21	11.7	−1%	9.9	15%
	α3	11.5	11.4	1%	11.8	−3%	9	22	9.7	16	9.3	19	11.4	1%	9.8	15%
	α4	11.6	10.1	13%	11	5%	9.4	19	9.7	16	9.2	21	9.5	18%	11.4	2%
	α5	11.4	10.3	10%	9.5	17%	9.3	18	9.3	18	9.2	19	8.6	25%	11.5	−1%
Top monitoring point	β1	27	22.7	16%	21.8	19%	20.9	23	20.6	24	21.5	20	21.2	21%	20.3	25%
	β2	25.3	22.7	10%	22.5	11%	21.6	15	21.3	16	21.5	15	20.5	19%	21	17%
	β3	23.8	22.4	6%	23	3%	22.1	7	21.8	8	21.6	9	19.9	16%	21.6	9%
	β4	22.9	22.7	1%	23.5	−3%	22.6	1	22.1	3	21.5	6	20.2	12%	22	4%
	β5	23	22.9	0%	23.8	−3%	22.8	1	22	4	21.8	5	20.8	10%	22.4	3%
Side monitoring point	γ1	20.7	20.5	1%	20.3	2%	19.1	8	18.4	11	18.8	9	17.9	14%	20.3	2%
	γ2	20.7	20.5	1%	20.4	1%	19.1	8	18.2	12	19	8	18	13%	20.4	1%
	γ3	20.7	20.5	1%	20.4	1%	19.1	8	17.9	14	19.1	8	18.1	13%	20.4	1%
	γ4	20.7	20.4	1%	20.4	1%	19	8	17.9	14	19.3	7	18.3	12%	20.4	1%
	γ5	20.6	20.3	1%	20.4	1%	19	8	18	13	19.4	6	18.5	10%	20.3	1%
Back monitoring point	δ1	30.1	24	20%	21.6	28%	21.8	28	21.1	30	22	27	22.8	24%	21.6	28%
	δ2	30.3	23.9	21%	21.6	29%	21.8	28	21.1	30	22.1	27	22.7	25%	21.5	29%
	δ3	30.5	23.7	22%	21.6	29%	21.8	29	21	31	22.2	27	22.6	26%	21.6	29%
	δ4	30.7	23.8	22%	21.6	30%	21.7	29	21.1	31	22.3	27	22.5	27%	21.6	30%
	δ5	30.9	23.9	23%	21.6	30%	21.7	30	21.1	32	22.4	28	22.3	28%	21.6	30%
Average vibration reduction ratio			9%		11%		16%		18%		16%		16%		12%