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Shock and Vibration
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Shock and Vibration
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2016
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Article
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Fig 11
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Research Article
Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method
Figure 11
Frequency domain graphs after FFT of accelerated velocity-time curves.
(a)
SG-A
(b)
SG-B
(c)
SG-C