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

Table 1

Statistic table of cutting holes blasting parameters of upper steps in grade V surrounding rock.

Segment	Blasthole name	Detonator extension time (ms)	Number of blast holes (piece)	Hole depth (m)	Hole spacing (cm)	Charge length (m)	Single-hole charge (kg)	Same deferred explosive charge (kg)	Number of detonators with same extension (piece)
1	Cutting hole	0	6	2.09	40	1.46	1.50	9.00	6