Time-Frequency Analysis and Application of a Vibration Signal of Tunnel Excavation Blasting Based on CEEMD-MPE-HT

Table 1

Basic design parameters of expanded excavation of the Loushan tunnel (unit: m).

Project	Loushan tunnel after expansion	Loushan tunnel before expansion
Section form	Two-way eight-lane	Two-way four-lane
Width of carriageway (m)	2 × 3.50 + 2 × 3.75	2 × 3.75
Lateral dimension (m)	0.50	0.50
Width of maintaining roadway (m)	0.75	0.75
Total width (m)	17.25	10.25
Tunnel clearance (m)	5.00	5.00