The Influence of the Track Parameters on Vibration Characteristics of Subway Tunnel

Table 3

Modification value of vertical effective acceleration within the center frequency.

1/2 octave bands center frequency (Hz)	1	2	4	8	16	31.5	63	90
Vertical modified vibration power level (dB)	−6	−3	0	0	−6	−12	−18	−21