Vibration Characteristics of Underground Structure and Surrounding Soil Underneath High Speed Railway Based on Field Vibration Tests

Table 3

Calculated attenuation index for the propagation of vibration waves in the underground structure and soil.

Physical sources	Velocity (km/h)/number of carriages	Horizontal direction	Vertical direction
Soil surround the metro station	180/16	1	1.5
	300/16	1	1.5
	300/8	1	1.5
Metro station	180/16	/	0.8
	300/(8, 16)	/	0.5