## 3 On-Site Blasting In Situ Experiment and Testing Analysis
### Field Test  
The slope at K1+500-600 in the site was chosen as the test object based on the geological exploration data, on-site reconnaissance, and careful consideration of variables like geological characteristics and the surrounding environment. It should be noted that the experiments carried out were based on the assumption that slope is characterized by variable surface morphology, while the internal structure of the soil mass is homogeneous in both properties and layer geometry. Variations in geometry are confined solely to the surface layer. At around 60 m in height, the test slope's bottom elevation is between 9 and 12 m. According to the site investigation, the slope is about 33 to 40 degrees, the overall slope is smooth and continuous without obvious concave and convex ups and downs, and from the top of the slope to the foot of the slope, the slope is basically the same, and does not form a ladder-like shape. At the base of the slope, blasting tests were carried out on a 10 m drilled hole, taking into account that the final elevation of the canal channel excavation is 0.5 m. Three slopes were chosen around the test slope for the three blasting tests, based on the size of the slope and the occurrence of the slope rock strata, along with test equipment and other conditions, and careful consideration of the slope location and distance, test workload and cost, measurement point layout and monitoring. Figure 2 displays the chosen test slope along with its slope surface. Drilling, charging, detonation and other tasks were completed at the appropriate place after choosing the side slope and slope surface. The diameter of the borehole was adjusted to 100 mm, and the explosion was started from outside the slope towards the inside to resemble the blasting parameters used in real engineering blasting. No. 2 emulsion explosive was chosen out of all the explosives used in actual engineering. The precise drilling and blasting plan is as follows, as depicted in the figure. Drill three blasting test holes with charges of 48 kg, 42 kg, and 36 kg each, perpendicular to the slope toe lines of the test slope's three slopes. The drilling parameters are as follows: drilling depth of 10 m, drilling diameter of 100 mm, drilling row distance of 4 m, and drilling distance from the slope toe line of 6 m. The No. 2 rock emulsion explosive was used. Emulsion explosives have a linear charge density of 0.30 kg/m and a roll diameter of 90 mm. Figure 3 shows the blasting plan diagram. When clogging, pack a mixture of drill bits and cement into the \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Name**} & **Natural** & **Saturation** & **Coefficient of Water** & **Uniaxial** & **Young’s** & **Poisson’s** \\  & **Density** & **Density** & **Saturation** & **Compression** & **Modulus** & **Ratio** \\ \hline sandstone & 2.64 g\(\cdot\)cm\({}^{-3}\) & 2.70 g\(\cdot\)cm\({}^{-3}\) & 0.51\% & 30.66 MPa & 13.35 Gpa & 0.30 \\ mudstone & 2.63 g\(\cdot\)cm\({}^{-3}\) & / & 2.91\% & 3.93 MPa & 7.1 Gpa & 0.34 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Physical and mechanical parameters of rock in the fourth group of the Liantan Group of the Lower Silurian System. bottom of the blocked section using kraft paper or a cement bag, and then compact the mixture using a wooden or plastic packing tamping rod. In the blasting test, the blast holes that were furthest away from the slope detonated one after the other, separated by 1.0 s.  
The existing equipment and test conditions were used to arrange multiple vibration velocity measuring points along three slope surfaces to fully obtain the vibration velocity of the particles of the sand-mudstone interbedded rock slope under the blasting disturbance, according to the test's purpose and the field conditions. Figure 2 displays the precise measuring point arrangement. The order in which the blasting tests are numbered corresponds to the ordering of the measuring points. The first blasting test is from 1 to 3, the second is from 4 to 6, and the third is from 7 to 9.