Research Article
Investigation on Methods of Determining the Grouting Quality of Embedded Rock Bolts Using High Frequency Guided Waves
Table 2
1#ā5# average amplitude ratio data.
| 1# | Frequency/MHz | Gain/dB | 20 | 22 | 25 | 30 | 35 | | 2.436 | Average amplitude ratio | 0.349 | 0.352 | 0.361 | 0.335 | 0.373 | | 2.118 | 0.170 | 0.171 | 0.173 | 0.162 | 0.177 | | 1.889 | 0.177 | 0.179 | 0.1819 | 0.171 | 0.185 | | 1.66 | 0.196 | 0.198 | 0.200 | 0.188 | 0.205 | | 1.47 | 0.212 | 0.214 | 0.217 | 0.206 | 0.222 |
| 2# | Frequency/MHz | Gain/dB | 20 | 25 | 30 | 35 | 40 | 45 | ā | 2.688 | Average amplitude ratio | 0.128 | 0.132 | 0.136 | 0.140 | 0.142 | 0.142 | 2.532 | 0.086 | 0.090 | 0.093 | 0.096 | 0.097 | 0.097 | 2.273 | 0.082 | 0.087 | 0.090 | 0.090 | 0.092 | 0.092 | 2.161 | 0.070 | 0.075 | 0.077 | 0.079 | 0.079 | 0.079 | 1.938 | 0.056 | 0.060 | 0.063 | 0.065 | 0.066 | 0.066 | 1.819 | 0.060 | 0.065 | 0.068 | 0.071 | 0.072 | 0.072 |
| 3# | Frequency/MHz | Gain/dB | 5 | 8 | 10 | 15 | 20 | 25 | 30 | 2.594 | Average amplitude ratio | 0.372 | 0.379 | 0.378 | 0.386 | 0.326 | 0.331 | 0.330 | 2.438 | 0.147 | 0.151 | 0.151 | 0.153 | 0.126 | 0.127 | 0.127 | 2.302 | 0.0901 | 0.093 | 0.093 | 0.095 | 0.076 | 0.077 | 0.077 | 2.135 | 0.070 | 0.073 | 0.073 | 0.075 | 0.059 | 0.060 | 0.060 | 1.884 | 0.043 | 0.045 | 0.045 | 0.048 | 0.037 | 0.038 | 0.039 | 1.651 | 0.051 | 0.052 | 0.052 | 0.055 | 0.043 | 0.045 | 0.046 |
| 4# | Frequency/MHz | Gain/dB | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 2.623 | Average amplitude ratio | 0.111 | 0.107 | 0.110 | 0.112 | 0.112 | 0.112 | 0.110 | 2.425 | 0.073 | 0.075 | 0.076 | 0.078 | 0.078 | 0.077 | 0.076 | 2.278 | 0.060 | 0.062 | 0.065 | 0.065 | 0.065 | 0.065 | 0.064 | 2.149 | 0.050 | 0.053 | 0.055 | 0.056 | 0.056 | 0.056 | 0.055 | 1.98 | 0.050 | 0.053 | 0.056 | 0.057 | 0.058 | 0.058 | 0.057 | 1.774 | 0.041 | 0.040 | 0.042 | 0.044 | 0.046 | 0.046 | 0.045 | 1.62 | 0.056 | 0.048 | 0.048 | 0.050 | 0.051 | 0.052 | 0.052 |
| 5# | Frequency/MHz | Gain/dB | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 2.745 | Average amplitude ratio | 0.042 | 0.035 | 0.032 | 0.036 | 0.041 | 0.039 | 0.040 | 2.494 | 0.049 | 0.048 | 0.048 | 0.050 | 0.052 | 0.046 | 0.043 | 2.367 | 0.038 | 0.038 | 0.038 | 0.039 | 0.040 | 0.034 | 0.032 | 2.245 | 0.040 | 0.039 | 0.039 | 0.041 | 0.040 | 0.034 | 0.031 | 2.149 | 0.034 | 0.034 | 0.034 | 0.035 | 0.035 | 0.030 | 0.027 | 2.004 | 0.033 | 0.034 | 0.034 | 0.035 | 0.035 | 0.030 | 0.027 | 1.874 | 0.028 | 0.029 | 0.029 | 0.030 | 0.030 | 0.026 | 0.024 |
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