## 4 SoilWorks Numerical Simulation
### Sensitivity Analysis
#### 4.2.4 Analysis Results
(2) Clay Layer (Undrained Condition)  
From the summarized analysis results in Table 16, it can be observed that when the soil elastic modulus varies from 50% to 200% of the baseline value (100%) in the undrained condition of the clay layer, the range of variation in the maximum bending moment (_Mmax_) is 205.65 to 327.72 kN-m, with a percentage change of 82% to 130%. The range of variation in the maximum displacement (_Dmax_) is 28.341 to 81.231 mm, with a percentage change of 60% to 173%. The range of variation in the average axial force (_Favg_) is 231.2 to 257.0 kN/m, with a percentage change of 96% to 106%. Line graphs depicting the percentage change in the three parameters (_Mmax_, _Dmax_, _Favg_) with respect to different soil elastic moduli were plotted. From Figure 14a, it can be observed that the sensitivity of the soil elastic modulus (_Es_) in the undrained condition of the clay layer is more significant for _Dmax_, with _Dmax_ showing a maximum increase of 73% when _Es_ is decreased by 50% and a maximum decrease of approximately 40% when _Es_ is increased by 200%. The results indicate that the variation in _Dmax_ is more pronounced when the soil elastic modulus is higher or lower, while the effect on _Favg_ is relatively small. Additionally, the sensitivity analysis results for the soil elastic modulus in the undrained condition of the clay layer from [PERSON] et al. 's [26] PLAXIS program were compared with the SoilWorks program. From Table 15 and Figures 14b and 15a,b, it can be observed that both programs show similar sensitivity to variations in _Mmax_, _Dmax_, and _Favg_ when the soil elastic modulus in the undrained condition of the clay layer is considered, with _Dmax_ exhibiting the most significant sensitivity. (3) Clay Layer (Drained Condition)  
From the summarized analysis results in Table 11, it can be observed that when the soil elastic modulus varies from 50% to 200% of the baseline value (100%) in the drained condition of the clay layer, the range of variation in the maximum bending moment (\(Mmax\)) is 327.66 to 439.21 kN-m, with a percentage change of 87% to 116%. The range of variation in the maximum displacement (\(Dmax\)) is 32.639 to 71.259 mm, with a percentage change of 70% to 152%. The range of variation in the average axial force (\(Favg\)) is 253.6 to 260.5 kN/m, with a percentage change of 99% to 102%. Line graphs depicting the percentage change in the three parameters (\(Mmax\), \(Dmax\), \(Favg\)) with respect to different soil elastic moduli were plotted. From Figure 16, it can be observed that the sensitivity of the soil elastic modulus (\(Es\)) in the drained condition of the clay layer is more significant for \(Dmax\), with \(Dmax\) showing a maximum increase of 52% when \(Es\) is decreased by 50% and a maximum decrease of approximately 30% when \(Es\) is increased by 200%. The results indicate that the variation in \(Dmax\) is more pronounced when the soil elastic modulus is higher or lower, while the effect on \(Favg\) is relatively small. Additionally, the sensitivity analysis results for the soil elastic modulus in the drained condition of the clay layer from [PERSON] et al. 's [26] PLAXIS program were compared with the SoilWorks program. From Table 12 and Figure 16 to Figure 17,b, it can be observed that both programs show similar sensitivity to variations in \(Mmax\), \(Dmax\), and \(Favg\) when the soil elastic modulus in the drained condition of the clay layer is considered, with \(Dmax\) exhibiting the most significant sensitivity. Figure 12: Comparison of the sensitivity diagrams for sandy soil (drained): (**a**) SoilWorks programs compared for elastic modulus (\(Mmax\), \(Dmax\) and \(Favg\)); (**b**) PLAXIS and SoilWorks programs compared for elastic modulus (\(Mmax\)). Figure 13: Comparison of the sensitivity of PLAXIS and SoilWorks programs to sandy soil (drained): (**a**) elastic modulus (\(Dmax\)); (**b**) elastic modulus (\(Favg\)).