## 3 Parameter Optimization
### Analysis
#### 3.3.2 Range Analysis and Variance Analysis  
According to the experimental data in Table 9, the average value of lateral displacement, crater depth, effective reinforced depth, lateral earth pressure, and deflection of the first reinforced layer at different levels are shown in Figure 10. Then, the lateral displacement, crater depth, effective reinforced depth, lateral earth pressure, and deflection of the first reinforced layer are analyzed by range analysis and variance analysis. The range and variance (\"F\" range) of the lateral displacement, lateral earth pressure, deflection of first reinforced layer, crater depth, and effective reinforced depth are shown in Figure 11. Figure 11 shows that the influence law of each factor on the target parameters in range analysis is basically the same as that in variance analysis. \begin{table}
\begin{tabular}{c c c c c c} \hline
**Tamper** & **Tamper** & **Maximum Impact** & **Action Period (s)** & **Minimum Critical** & **Minimum Central** \\
**Radius (m)** & **Quality (kg)** & **Stress (MPa)** & **Champing Ratio** & **Frequency (Hz)** \\ \hline
0.06 & 5 & 0.236 & 0.021 & 0.05 & 24 \\ \hline \end{tabular}
\end{table} 
Table 10: Parameters of dynamic analysis. \begin{table}
\begin{tabular}{c c c c c} \hline
**Elastic Modulus (GPa)** & **Thick (m)** & **Shear Stiffness (MPa)** & **Cohesion (kPa)** & **Poisson Ratio** \\ \hline
25 & 0.005 & 2.3 & 0 & 0.33 \\ \hline \end{tabular}
\end{table} 
Table 9: Mechanical parameters of the soil sample. Figures 10 and 11 show that:  
In the range analysis and variance analysis of the lateral displacement, the influence degree of each factor on the lateral displacement is in the order: embedded ratios > elastic modulus > number of reinforced layers > internal angle of friction > interval of reinforced layer. Among them, the embedded ratio has the greatest influence on the lateral displacement. The influence degree of friction angle and interval of reinforced geogrids is relatively small. With the increase of embedded ratio, the lateral displacement decreases gradually. The reason is that the constraining effect on settlement decreases  
Figure 10: Average value at different values of (**a**) lateral displacement; (**b**) crater depth; (**c**) effective reinforced depth; (**d**) lateral earth pressure; (**e**) deflection of the first reinforced layer. gradually with the increase of embedded depth. The optimal solution of the lateral displacement is A\({}_{\text{K1}}\)D\({}_{\text{K2}}\)B\({}_{\text{K2}}\)E\({}_{\text{K2}}\)C\({}_{\text{K2}}\). In the range analysis and variance analysis of the crater depth, the influence degree of each factor on the crater depth is in the order: embedded ratio \(>\) interval of reinforced layers \(>\) elastic modulus \(>\) number of reinforced layers \(>\) internal angle of friction. Among them, the embedded ratio has the greatest influence on the crater depth. The influence degree of the number of reinforced layers and friction angle is relatively small. With the increase of embedded ratio, the crater depth increases gradually. The reason is that the constraining effect on settlement decreases gradually with the increase of embedded depth. The optimal solution of the crater depth is A\({}_{\text{K5}}\)C\({}_{\text{K3}}\)D\({}_{\text{K3}}\)B\({}_{\text{K3}}\)E\({}_{\text{K4}}\). In the range analysis and variance analysis of the effective reinforced depth, the influence degree of each factor on the effective reinforced depth is in the order: elastic modulus \(>\) internal angle of friction \(>\) embedded ratio \(>\) interval of reinforced layers \(>\) number of reinforced layers. Among them, the elastic modulus has the greatest influence on the effective reinforced depth. The influence degree of number of reinforced layers is relatively small. With the increase of the number of reinforced layers, the effective reinforced depth increases first and then decreases. With the decrease of elastic modulus, the effective reinforced depth increases gradually.