## 4 Results
### Weights of Indicators  
In this study, the study area was divided into multiple cells using a grid of 500 m by 500 m. These cells were selected as assessment samples for four layers of UUS, namely, L\({}_{1}\), L\({}_{2}\), L\({}_{3}\), and L\({}_{4}\). An initial assessment indicator matrix was created using Equation (1). Entropy and CRITIC weights were then calculated based on Equations (2)-(13). Using Equation (14), combined weights were calculated based on entropy and CRITIC weighting methods (Figure 13). The L\({}_{1}\) layer of UUS was taken as an example to illustrate the calculating processes and outcomes; the information is presented in Tables 2 and 3. Figure 9: Zoning map of land subsidence rate. Figure 11: Zoning map of groundwater chemical corrosion intensity. Figure 10: Zoning map of sands liquefaction index. Figure 12: Zoning map of soil chemical corrosion intensity. Figure 13: Weights curve of sub-criteria indicators for L\({}_{1}\)–L\({}_{4}\) layers. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Criteria Indicators** & **Sub-Criteria Indicators** & **Entropy Values,** & **Otherness Coefficients,** & **Entropy Weights,** \\  & & \(E\) & \(\mathbf{G}\) & \(\mathbf{v}\) \\ \hline Topography & Ground elevation, I\({}_{1}\) & 0.9281 & 0.0719 & 5.61\% \\ \hline  & Bearing capacity of soils & 0.9710 & 0.0290 & 2.26\% \\  & Bearing capacity of soils & 0.7707 & 0.2293 & 17.90\% \\  & (\(-\)5\(\ldots\)\(-\)10 m), I\({}_{3}\) & 0.9759 & 0.0241 & 1.88\% \\ Geotechnical characteristics & Compression modulus of soils & 0.9660 & 0.0340 & 2.65\% \\  & Compression modulus of soils & 0.5948 & 0.4052 & 31.62\% \\  & Compression modulus of soils & 0.6823 & 0.3177 & 24.80\% \\  & (\(-\)10\(\ldots\)\(-\)15 m), I\({}_{7}\) & 0.9330 & 0.0670 & 5.23\% \\ Hydrogeological conditions & Aquifer thickness & 0.9788 & 0.0212 & 1.65\% \\  & (\(0\)\(\ldots\)\(-\)15 m), I\({}_{9}\) & 0.9903 & 0.0097 & 0.76\% \\  & Sands liquefaction index, I\({}_{11}\) & 0.9671 & 0.0329 & 2.57\% \\ Adverse geological phenomena & Chemical corrosion of groundwater, I\({}_{12}\) & 0.9913 & 0.0087 & 0.68\% \\  & Chemical corrosion of soils, I\({}_{13}\) & 0.9694 & 0.0306 & 2.39\% \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Processes and outcomes information with entropy weighting method for L\({}_{1}\) layer. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Criteria Indicators** & **Sub-Criteria Indicators** & **Deviation Values,** \(\mathbf{S}\) & **Conflicting Values,** \(\mathbf{A}\) & **Quantity of Information,** \(\mathbf{C}\) & **CRITIC Weights,** \(\mathbf{u}\) \\ \hline Topography & Ground elevation, I\({}_{1}\) & 0.439 & 9.508 & 4.173 & 11.45\% \\ \hline  & Bearing capacity of soils & 0.345 & 10.747 & 3.711 & 10.18\% \\  & Bearing capacity of soils & & & \\  & (\(-\)5\(\ldots\)\(-\)10 m), I\({}_{3}\) & 0.255 & 9.640 & 2.459 & 6.75\% \\ Geotechnical characteristics & Bearing capacity of soils & 0.191 & 10.258 & 1.963 & 5.39\% \\  & Compression modulus of soils & 0.192 & 10.464 & 2.013 & 5.52\% \\  & Compression modulus of soils & 0.129 & 11.674 & 1.507 & 4.14\% \\  & Compression modulus of soils & 0.092 & 13.087 & 1.200 & 3.29\% \\  & Sools (\(-\)10\(\ldots\)\(-\)15 m), I\({}_{7}\) & 0.415 & 9.535 & 3.957 & 10.86\% \\ Hydrogeological conditions & Aquifer thickness & & & \\  & (0\(\ldots\)\(-\)15 m), I\({}_{9}\) & 0.304 & 12.356 & 3.761 & 10.32\% \\  & Land subsidence rate, I\({}_{10}\) & 0.228 & 13.771 & 3.145 & 8.63\% \\  & Sands liquefaction index, I\({}_{11}\) & 0.350 & 9.728 & 3.403 & 9.34\% \\  & Chemical corrosion of groundwater, I\({}_{12}\) & 0.225 & 10.259 & 2.305 & 6.32\% \\  & Chemical corrosion of soils, I\({}_{13}\) & 0.298 & 9.557 & 2.846 & 7.81\% \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Processes and outcomes information with CRITIC weighting method for L\({}_{1}\) layer. For the shallow layer (L\({}_{1}\)) within a depth of 0\(--\)15 m, grade I, grade II, grade III, and grade IV accounted for 28.87%, 25.82%, 37.59%, and 7.72% of the study area, respectively (Figure 14).