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Table 1 Comparison of the measured depth and the calculated gap depth

From: An impact echo method to detect cavities between railway track slabs and soil foundation

No Cavity Size (mm) TCL Thickness (mm) Calculation
Gap depth (mm)
Frequency (Hz)
1 400 × 400 250 259 2035
2 252 2087
3 246 2144
4 199 2658