## 4 SoilWorks Numerical Simulation
### Sensitivity Analysis
#### 4.2.4 Analysis Results
When the friction angle is smaller, especially in terms of _Mmax_ or _Dmax_, the variation in the PLAXIS program is more significant compared to the SoilWorks program, indicating that PLAXIS is more sensitive to the friction angle in the clay layer (undrained condition) when the friction angle is smaller. \begin{table}
\begin{tabular}{c c c c c c c} \hline \multirow{2}{*}{**SM**} & \multirow{2}{*}{ \begin{tabular}{c} _Mmax_ \\ \end{tabular}  } & \multirow{2}{*}{ \begin{tabular}{c} _Pcentage_ \\ \end{tabular}  } & \multirow{2}{*}{_Dmax_} & \multirow{2}{*}{\ \begin{tabular}{c} _Pcentage_ \\ \end{tabular}  } & \multirow{2}{*}{_Favg_} & \multirow{2}{*}{ \begin{tabular}{c} _Pcentage_ \\ \end{tabular}  } \\ \cline{2-2} \cline{5-6}  & & **(kN-m)** & & & & \\ \hline _0.8\(\Phi\)_ & 392.24 & 121\% & 40.840 & 124\% & 278.8 & 114\% \\ \hline _0.9\(\Phi\)_ & 353.90 & 110\% & 36.116 & 110\% & 260.4 & 106\% \\ \hline _1.0\(\Phi\)_ & 323.07 & 100\% & 32.872 & 100\% & 245.4 & 100\% \\ \hline _1.1\(\Phi\)_ & 300.21 & 93\% & 30.852 & 94\% & 233.4 & 95\% \\ \hline _1.2\(\Phi\)_ & 282.78 & 88\% & 29.664 \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{\begin{tabular}{c} **CL** \\ **(Undrained)** \\ \end{tabular} } & \multicolumn{2}{c}{\begin{tabular}{c} _Mmax_ \\ **Percentage Change** \\ \end{tabular} } & \multicolumn{2}{c}{\
\begin{tabular}{c} _Dmax_ \\ **Percentage Change** \\ \end{tabular} } & \multicolumn{2}{c}{
\begin{tabular}{c} _Favg_ \\ **Percentage Change** \\ \end{tabular} } \\ \cline{2-7}  & **SoilWorks** & **PLAXIS** & **SoilWorks** & **PLAXIS** & **SoilWorks** & **PLAXIS** \\ \hline _0.8\(\Phi\)_ & 106\% & 133\% & 103\% & 129\% & 105\% & 118\% \\ _0.9\(\Phi\)_ & 102\% & 112\% & 101\% & 110\% & 102\% & 107\% \\ _1.0\(\Phi\)_ & 100\% & 100\% & 100\% & 100\% & 100\% & 100\% \\ _1.1\(\Phi\)_ & 98\% & 93\% & 99\% & 95\% & 98\% & 97\% \\ _1.2\(\Phi\)_ & 97\% & 90\% & 98\% & 93\% & 96\% & 96\% \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Sensitivity of friction angle for clay layers (undrained) in PLAXIS and SoilWorks. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{\begin{tabular}{c} **CL** \\ **(Undrained)** \\ \end{tabular} } & \multicolumn{2}{c}{\begin{tabular}{c} _Mmax_ \\ **Percentage Change** \\ \end{tabular} } & \multicolumn{2}{c}{\
\begin{tabular}{c} _Dmax_ \\ **Percentage Change** \\ \end{tabular} } & \multicolumn{2}{c}{
\begin{tabular}{c} _Favg_ \\ **Percentage Change** \\ \end{tabular} } \\ \cline{2-7}  & **SoilWorks** & **PLAXIS** & **SoilWorks** & **PLAXIS** & **SoilWorks** & **PLAXIS** \\ \hline _0.8\(\Phi\)_ & 106\% & 133\% & 103\% & 129\% & 105\% & 118\% \\ _0.9\(\Phi\)_ & 102\% & 112\% & 101\% & 110\% & 102\% & 107\% \\ _1.0\(\Phi\)_ & 100\% & 100\% & 100\% & 100\% & 100\% & 100\% \\ _1.1\(\Phi\)_ & 98\% & 93\% & 99\% & 95\% & 98\% & 97\% \\ _1.2\(\Phi\)_ & 97\% & 90\% & 98\% & 93\% & 96\% & 96\% \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Sensitivity of friction angle for clay layers (undrained) in PLAXIS and SoilWorks. Figure 8: Comparison of the sensitivity diagrams for sandy soil (drained): (a) SoilWorks programs compared for friction angle (_Mmax_, _Dmax_ and _Favg_); (b) PLAXIS and SoilWorks programs compared for friction angle (_Mmax_).