Analysis of the Tunneling Blast Safety Criterion Based on Longitudinal Shocks

Table 4

Safety criterion data determined by the numerical simulation.

Distance (m)	Tunnel surrounding rock		Along the tunnel design line
	Peak velocity (cm/s)	Effective tensile stress (MPa)	Peak velocity (cm/s)	Effective tensile stress (MPa)
10	10.51	2.465	3.045	1.187
20	6.423	0.5122	2.638	0.8263
30	3.218	0.1823	1.864	0.5376
50	2.505	0.1246	1.028	0.2786
80	1.321	0.1146	0.7452	0.1853