382 3.3. Result of RQD measurement The RQD values obtained from the actual measurements were then compared with the RQD values calculated by detecting cracks using the application. The RQD measurements and the crack detection results are shown in Figure 4. The mean discrepancy between the RQD measurements and the application-generated measurements was 11.8, as presented in Table 1. When this RQD measurement error was applied to the Rock Mass Rating (RMR) rock mass rating index, the difference in scores averaged 3 points. Consequently, despite the presence of a certain degree of error, the application-based evaluation method was found to be significantly more time-efficient than the conventional approach. These findings imply that automation through application may enhance the efficiency and expediency of RQD evaluation, thereby underscoring its potential as a practical rock quality evaluation tool in fieldwork. Figure 4 Comparison of RQD: (a) sample pictures (b) crack detection using the application
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