## 5 Model Verification on the Blast Field  
Based on tests on the laboratory model and the obtained results, as well as the analysis of the results, the verification of the model in terms of the influence of the burden deviation on the intensity of the vibration during blasting was carried out on the blast field. For this case of testing at a quarry, 12 blasholes were used. The same instrument and methodology were used to measure the blasting vibration during field tests. The instrument was placed at a distance of 60 m from the axis of the blashhole. The diameter of the blashhole was 89 mm, and the blashhole length was 10 m. In this case, an example of a blashhole profile with different values of the burden along the length of the blashhole was given. These values were used in the calculation of the surfaces, as in the case of the laboratory model. Figure 14 represents a 3D model of the blashhole with different values of the burden where the burden size is less than the designed one (red line), equal to the designed one (green line) and greater than the designed one (blue line). In this case, through comparative analysis of the results of measurements on the laboratory model and field measurements, in places where there is a deviation of burden greater than the designed one (blue line), the value of peak particle velocity should be higher. The different values of burden along the blashhole are also represented with a number of each value for the burden deviation from the designed one. Figure 14: Three-dimensional model of the blashhole obtained using O-Pitblast software with the display of different values of the burden. The records of the vibration instruments and the results of statistical analysis confirm the increase in the intensity of blasting vibration as the value of burden is higher (as shown in the graph in Figure 14). All measurement blasting vibrations from the field tests shown in the Figure 15, are represented in Table 5.  
Verification of the model obtained under laboratory conditions was performed by applying the same formulas to the data obtained from measurements in the field. The surface of the blasted material for the case, when the burden is equal to the designed one, can be calculated using Equation (3):  
\[\Delta\text{P}_{\text{des}} =\Delta\text{P}_{\text{des}_{1}}+\Delta\text{P}_{\text{des}_{2}}+.....+\Delta\text{P}_{\text{des}_{6}}=261\text{ m}^{2}\]  
The surface of the blasted material for the case when there is a deviation in the burden and when its value is greater than the designed one can be obtained using Equation (4):  
\[\Delta\text{P}_{\text{dev}} =\Delta\text{P}_{\text{dev}_{1}}+\Delta\text{P}_{\text{dev}_{2}} +.....+\Delta\text{P}_{\text{dev}_{6}}=277.9\text{ m}^{2}\]  
The difference between these surfaces \"\(\Delta\text{P}\)\" can be calculated using Equation (2):  
\[\Delta\text{P} =\frac{\Delta\text{P}_{\text{des}}}{\Delta\text{P}_{\text{dev}}} =0.94\]  
Figure 15: Dependence of peak particle velocity (PPV) in relation to the value of the deviation of the burden size from the designed one during the test on the blast field. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Burden Values (mm)** & **Surface of Blasted Material (mm\({}^{2}\))** & **PPV (mm/s)** \\ \hline B = 30 & 47.2 & 35.3 \\ B \textgreater{} 30 & 49.6 & 37.8 \\ \hline B = 30 & 39.4 & 42.4 \\ B \textgreater{} 30 & 44.9 & 57.3 \\ \hline B = 30 & 39.1 & 37.1 \\ B \textgreater{} 30 & 41.5 & 82 \\ \hline B = 30 & 41.5 & 31.2 \\ B \textgreater{} 30 & 44.9 & 52.2 \\ \hline B = 30 & 44.9 & 33.8 \\ B \textgreater{} 30 & 45.1 & 51 \\ \hline B = 30 & 48.9 & 35.7 \\ B \textgreater{} 30 & 51.9 & 49.8 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Test results of measurement from field test with burden influence for B = 30 mm and B > 30 mm.