The Tunnel Structural Mode Frequency Characteristics Identification and Analysis Based on a Modified Stochastic Subspace Identification Method

<div>The hammer impulse load applied in the subway tunnel: (a) time spectrum; (b) frequency spectrum.</div>

Shock and Vibration

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Figure 10

Figure 10: The Tunnel Structural Mode Frequency Characteristics Identification and Analysis Based on a Modified Stochastic Subspace Identification Method 

Figure 10 | The Tunnel Structural Mode Frequency Characteristics Identification and Analysis Based on a Modified Stochastic Subspace Identification Method 