Numerical Study on the Mechanism and Application of Artificial Free Surfaces in Bedrock Blasting of Shield Tunnels

Table 12

Peak values of the vibration velocity in the direction without a free surface.

Particle no.	No. 1	No. 2	No. 3	No. 4	No. 5
Peak velocity in the direction (cm/s)	2.64	2.45	2.16	2.08	1.89