## 4 Discussion
### Effect of Ground-Borne Vibrations on the Building
The assessment of the impact of vibrations generated during the operation of the MTS V8 hydraulic compactor and the DPU 6055 plate compactor, and then it is transferred via the ground to the building in question in accordance with the above standards, is based on peak component particle velocities. The PPVi values required for evaluation may come from the numerical integration of recorded time history of vibration accelerations, but as is known, this type of digital signal processing can lead to large errors. Therefore, the assessment of the impact of vibrations generated by the work of compactors and propagated via ground to the building was carried out for PPVi values registered with the MEMS transducer dedicated to this type of measurements and assessments (GEA type by Sequoia). PPVi values listed in Tables 5-7 are based on measurements carried out on the foundation wall of the building in the immediate vicinity of the first measurement point (MP1)--practically in the same time intervals for which the maximum absolute value of the acceleration signals (PPAi) were obtained using the Bruel&Kjaer 8340 seismic accelerometers presented in Tables 2-4. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Device/Mode/Depth of Compaction** & **PPVx** & **PPVy** & **PPVz** \\ \hline MTS V8/X1/0.4 m & 0.821 & 0.191 & 0.424 \\ MTS V8/X1/1.2 m & 0.671 & 0.254 & 0.428 \\ MTS V8/X1/1.8 m & 0.592 & 0.257 & 0.415 \\ \hline MTS V8/X2/0.4 m & 0.786 & 0.273 & 0.329 \\ MTS V8/X2/1.2 m & 0.643 & 0.232 & 0.377 \\ MTS V8/X2/1.9 m & 0.437 & 0.217 & 0.402 \\ \hline MTS V8/X3/0.4 m & 0.403 & 0.184 & 0.397 \\ MTS V8/X3/1.2 m & 0.530 & 0.216 & 0.444 \\ MTS V8/X3/1.9 m & 0.415 & 0.244 & 0.283 \\ \hline Plate compactor/0.4 m & 0.821 & 0.191 & 0.424 \\ Plate compactor/1.2 m & 0.300 & 0.220 & 0.412 \\ Plate compactor/1.8 m & 0.260 & 0.242 & 0.268 \\ \hline Max PPV\(i\) = & 0.821 & 0.273 & 0.444 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Peak component particle velocities at the foundation wall of the building—stage II, mm/s. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Device/Mode/Depth of Compaction** & **PPVx** & **PPVy** & **PPVz** \\ \hline MTS V8/X1/0.4 m & 2.355 & 0.328 & 0.775 \\ MTS V8/X1/1.2 m & 1.673 & 0.503 & 0.843 \\ MTS V8/X1/1.9 m & 1.281 & 0.653 & 1.158 \\ \hline MTS V8/X2/0.4 m & 1.059 & 0.384 & 0.584 \\ MTS V8/X2/1.2 m & 0.978 & 0.435 & 0.613 \\ MTS V8/X2/1.9 m & 0.685 & 0.327 & 0.786 \\ \hline MTS V8/X3/0.4 m & 0.936 & 0.297 & 0.606 \\ MTS V8/X3/1.2 m & 0.612 & 0.352 & 0.523 \\ MTS V8/X3/1.9 m & 0.491 & 0.249 & 0.489 \\ \hline Plate compactor/0.4 m & 0.532 & 0.246 & 0.515 \\ Plate compactor/1.2 m & 0.380 & 0.202 & 0.406 \\ Plate compactor/1.9 m & 0.408 & 0.274 & 0.371 \\ \hline Max PPV\(i\) = & 2.355 & 0.653 & 1.158 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Peak component particle velocities at the foundation wall of the building—stage III, mm/s. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Device/Mode/Depth of Compaction** & **PPVx** & **PPVy** & **PPVz** \\ \hline MTS V8/X1/0.4 m & 0.615 & 0.268 & 0.523 \\ MTS V8/X1/1.2 m & 0.708 & 0.195 & 0.369 \\ MTS V8/X1/2.0 m & 0.550 & 0.205 & 0.388 \\ \hline MTS V8/X2/0.4 m & 0.493 & 0.258 & 0.296 \\ MTS V8/X2/1.2 m & 0.577 & 0.217 & 0.334 \\ MTS V8/X2/2.0 m & 0.336 & 0.204 & 0.360 \\ \hline MTS V8/X3/0.4 m & 0.329 & 0.226 & 0.318 \\ MTS V8/X3/1.2 m & 0.273 & 0.217 & 0.342 \\ MTS V8/X3/2.0 m & 0.222 & 0.174 & 0.300 \\ \hline Plate compactor/0.4 m & 0.193 & 0.195 & 0.332 \\ Plate compactor/1.2 m & 0.230 & 0.220 & 0.325 \\ Plate compactor/2.0 m & 0.225 & 0.145 & 0.215 \\ \hline Max PPV\(i\) = & 0.708 & 0.268 & 0.523 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Peak component particle velocities at the foundation wall of the building—stage I, mm/s. As demonstrated by the subsequent comparative analyses of PPVi values obtained from the numerical integration of the time history of vibration accelerations registered with seismic accelerometers, they do not differ significantly from the PPVi values registered with the GEA sensor.