## 2 Materials and Methods
### Permissible Vibration Limit Values  
In technical practice, the assessment of the impact of the blasting operations is focused on different technical buildings and constructions depending on their importance for the society, the characteristics of the construction, their methods of utilization or their age,etc. (e.g., nuclear power plants, water dams, transport tunnels, engineering networks, tower buildings and historical ones and housing). In many countries, accurate normative values are defined for their protection from the damage caused by the particle velocity and frequency. Different countries apply different standards, and others modify or adopt them. The Slovak, Czech and German praxes prescribe low values, i.e., 5-10 mm.s\({}^{-1}\), but, for example, in Russia, the admissible values are up to 30 mm.s\({}^{-1}\), and in the USA, they are up to 50 mm.s\({}^{-1}\)[34; 55; 56]. The problem lies in the precise assessment of the stated and secure standards for housing, as the inhabitants of them have different experiences with the impact of the blasting operations. There are hygienic standards for the inhabitants of the housing, which evaluate the impacts of blasting operations on humans through the measurement of the vibration acceleration in the housing [51]. In the village of Trebejov, it is possible to classify buildings into resistance class B based on the recommendations of the STN EN 1998-1/NA/Z1 [51] seismic loading of building structures concerning charges used for aperture blasting, which are in the order of tens of kilograms, where oscillation frequencies are usually f > 10 Hz and based on the resistance of buildings to technical seismicity. As for the type and category of foundation soil of the protected objects, due to the absence of more specific characteristics and data, we can classify them into category b, which is the closest to reality (groundwater level is more than 3 m below the surface level). Based on measured data during blasting in Trebejov Quarry, where the oscillation frequencies were f <10 Hz, and due to the long-term nature of blasting at the limestone deposit in Trebejov Quarry, a predominantly higher age of buildings cracks was identified. Concerning Trebejov Quarry and the buildings in the municipality of Trebejov, the maximum permissible particle velocity (velocity component) was determined as v\({}_{\text{d}}\leq\) 3 mm.s\({}^{-1}\) (Table 3) [34; 51]. From the viewpoint of the impact of the blasting on the inhabitants of the buildings, it is also necessary to introduce the admissible parameters of the vibrations in the indoor environment of the buildings. According to Law No. 355/277 regarding the protection, support and development of public health, Decree MZ SR No. 549/2007 and No. 237/2009 \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multicolumn{5}{c}{**Maximum Particle Velocities for the Frequency Area**} & \multicolumn{2}{c}{**Class of Resistance of**} & \multicolumn{1}{c}{**Type of**} \\ \cline{1-1} \(f_{\text{k}}\) **< 10 Hz** & **10 Hz \(<f_{\text{k}}\) \(<50\) Hz** & \(f_{\text{k}}\) **> 50 Hz** & **Level of Damage** & **an Object** & **Foundation** \\ \hline Up to 3 & 3 to 6 & 6 to 5 & 0 & A & a \\
3 to 6 & 6 to 12 & 12 to 20 & 0 & B & a \\
6 to 10 & 10 to 20 & 15 to 30 & 0 & B & b,c \\  & & & 1 & A & a \\  & & & 0 & C & b \\
8 to 15 & 15 to 30 & 20 to 30 & 1 & A & b,c \\  & & & 1 & B & a \\  & & & 0 & C & c \\
10 to 20 & 20 to 30 & 30 to 50 & 1 & B & b \\  & & & 2 & A & a \\  & & & 0 & D & b,c \\  & & & 0 & E & a \\
15 to 25 & 25 to 40 & 40 to 70 & 1 & C & b \\  & & & & B & c \\  & & & 2 & A & b,c \\
20 to 40 & 40 to 60 & 60 to 100 & 0 & E & b,c \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Table Dependence of the damage level on maximum particle velocity, type of the structure and foundation soil according to STN EN 1998-1/NA/Z1 [51]. (Table 4) concern residential buildings, dormitories and retirement homes, for the reference time interval [57, 58, 59]:  
_day:_\(a_{wmax,p}=0.11\) m.s\({}^{-2}\),  
_measured max.