Numerical Evaluation on Dynamic Response of Existing Underlying Tunnel Induced by Blasting Excavation of a Subway Tunnel

Table 4

Dynamic response on NBBT lining induced by tunneling.

	Full-face excavation	CD method excavation
Blasting source distance/m	37	37	25	12
Maximum peak tensile stress/MPa	1.28	0.45	0.63	1.83
Maximum peak particle velocity/cm/s	12.6	3.5	5.8	15.8
Frequency at peak particle velocity/Hz	35.7	54.3	61.1	63.9