Application of Impact Imaging Method on Nondestructive Detection of Void Defects in Sandwich-Structured Immersed Tunnel

Figure 11

Comparisons between the test results and the measured results after opening the compartment. (a) Normalised impact response intensity of measuring point at position No. 1, (b) measured value of the concrete filling condition after opening the compartment at position No. 1, (c) on-site photo after opening the compartment at position No. 1, (d) impact imaging test results of measuring points at position No. 2, (e) measured value of the concrete filling condition after opening the compartment at position No. 2, and (f) on-site photo after opening the compartment at position No. 2.

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