## 4 Results  
After the tests were carried out for these burden values of B = 20 mm, B = 30 mm, and B = 40 mm, 27 measurements were taken in order to determine the dependence of the increase in burden value, which at the same time affects the increase in the surface of the blasted material, on the increase in the intensity of vibration. All results of the measurement are shown in Table 3.  
Figure 11: Measurement of vibrations and condition of the free face before (**a**) and after (**b**) the initiation of blashhole. Figure 10: Three-dimensional model of the sample before and after initiation of the blashhole in O-Pitblast software. The test results for three burden values were statistically analyzed. Figure 12 shows the dependence of PPV on the surface of the blasted material for different burden values. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Burden Values (mm)** & **Surface of Blasted Material (mm2)** & **PPV (mm/s)** \\ \hline B = 20 & 1476 & 13.8 \\ B = 30 & 2418 & 30.94 \\ B = 40 & 3385 & 96.95 \\ \hline B = 20 & 1514 & 18.6 \\ B = 30 & 2364 & 28.99 \\ B = 40 & 3003 & 98.13 \\ \hline B = 20 & 1497 & 44.11 \\ B = 30 & 2468 & 49.43 \\ B = 40 & 3466 & 127 \\ \hline B = 20 & 1666 & 43.17 \\ B = 30 & 2631 & 60.88 \\ B = 40 & 3178 & 63.59 \\ \hline B = 20 & 1582 & 44.47 \\ B = 30 & 2457 & 86.09 \\ B = 40 & 3301 & 103.6 \\ \hline B = 20 & 1610 & 36.38 \\ B = 30 & 2457 & 50.03 \\ B = 40 & 2781 & 202.4 \\ \hline B = 20 & 1560 & 64.23 \\ B = 30 & 2301 & 97.33 \\ B = 40 & 3210 & 110 \\ \hline B = 20 & 1542 & 52.86 \\ B = 30 & 2301 & 98.33 \\ B = 40 & 3181 & 231.2 \\ \hline B = 20 & 1630 & 58.91 \\ B = 30 & 2561 & 99.4 \\ B = 40 & 3148 & 107.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Test results of measurement burden influence for B = 20 mm, B = 30 mm, and B = 40 mm. Figure 12: Dependence of the peak particle velocity (PPV) on the blasted material for different burden values. Further research was carried out to examine the case where the burden was, for example, designed so that B = 30 mm along the entire length of the blashhole. Then, it could be said that these were optimal conditions that affect the intensity of vibrations in regard to the burden that has deviations from the designed one, i.e., is not equal along the entire blashhole. The dependence of peak particle velocity (PPV) on the burden deviation from the designed one is presented in Figure 13.  
According to the diagram given in Figure 13, it can be seen that the values of the vibrations due to the initiation of the blashholes increase with the increase in the surface of the blasted material. For this test, the measurements are shown in Table 4. \begin{table}
\begin{tabular}{c c c} \hline
**Burden Values (mm)** & **Surface of Blasted Material (mm2)** & **PPV (mm/s)** \\ \hline B = 30 & 2418 & 30.94 \\ B > 30 & 2492 & 86.09 \\ \hline B = 30 & 2364 & 28.99 \\ B > 30 & 2457 & 50.05 \\ \hline B = 30 & 2468 & 49.43 \\ B > 30 & 2501 & 98.33 \\ \hline B = 30 & 2631 & 59.54 \\ B > 30 & 2795 & 60.88 \\ \hline B = 30 & 2301 & 97.33 \\ B > 30 & 2561 & 99.4 \\ \hline B = 30 & 2457 & 131.9 \\ B > 30 & 2624 & 147.6 \\ \hline B = 30 & 2059 & 80.69 \\ B > 30 & 2476 & 174.7 \\ \hline B = 30 & 2371 & 96.06 \\ B > 30 & 2552 & 115.1 \\ \hline \end{tabular}
\end{table} 
Table 4: Test results of measurement burden influence for B = 30 mm and B > 30 mm. Figure 13: Dependence of peak particle velocity (PPV) in relation to the deviation value of the burden size from the designed one. To determine the dependence of increased vibrations on burden deviation more precisely, the measured results will also be analyzed mathematically. In this case, the dependence could be:  
\[\mathrm{K=}\frac{\Delta\mathrm{V_{max}}}{\Delta\mathrm{P}} \tag{1}\]  
where  
\(\Delta\mathrm{V_{max}}\) represents the ratio between peak particle velocity (PPV) for the burden size B = 30 mm and B > 30 mm;  
\(\Delta\mathrm{P}\) represents the ratio between the surface with the deviation of the burden size for the values B = 30 mm and B > 30 mm.