Research Article
Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method
Table 4
Comparison between tested peak frequency and theoretical results under different working conditions.
| | Model number | (Hz) | (Hz) | (Hz) |
| | SG-A-DE | 6738 (6271) | 4590 (4908) | Not obvious (3256) | | SG-A-ND | 6348 (6271) | — | 3027 (3256) | | SG-B-DE | 6543 (6271) | 4883 (5311) | Not obvious (3413) | | SG-B-ND | 6640 (6271) | — | 3516 (3413) | | SG-C-DE | 6641 (6271) | 5566 (5489) | Not obvious (4253) | | SG-C-ND | 6641 (6271) | — | 4499 (4253) |
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Note: values in ( ) are theoretical results.
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