Study on Dynamic Response Characteristics and Damage Mechanism of Tunnel Lining at Entrance of Shallow Bias Tunnel

Figure 7

Acceleration spectrum curve of different measuring points. (a) 0.3 g A1 acceleration-time history. (b) 0.3 g A3 acceleration-time history. (c) 0.3 g A7 acceleration-time history. (d) 0.3 g A5 acceleration-time history.

(a)

(b)

(c)

(d)