## 3 Results
### Multi-source data fusion.
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Point** & **Primary Indicators** & **Secondary Indicators** & **m (Safe)** & **m (Yellow)** & **m (Orange)** & **m (Alarm)** & **m (G)** \\ \hline \multirow{4}{*}{C1} & surface settlement & cumulative value & 0.056 & 0.000 & 0.424 & 0.230 & 0.289 \\  & surface settlement & rate of change & 0.093 & 0.049 & 0.570 & 0.249 & 0.039 \\  & groundwater level & cumulative value & 0.191 & 0.582 & 0.045 & 0.081 & 0.101 \\  & groundwater level & rate of change & 0.119 & 0.290 & 0.152 & 0.083 & 0.357 \\  & pile horizontal displacement & cumulative value & 0.112 & 0.130 & 0.525 & 0.177 & 0.056 \\  & rate of change & 0.057 & 0.000 & 0.471 & 0.218 & 0.254 \\ \hline \multirow{4}{*}{C5} & surface settlement & cumulative value & 0.244 & 0.600 & 0.068 & 0.082 & 0.006 \\  & rate of change & 0.260 & 0.574 & 0.012 & 0.060 & 0.095 \\  & groundwater level & cumulative value & 0.250 & 0.591 & 0.003 & 0.053 & 0.102 \\  & rate of change & 0.258 & 0.474 & 0.003 & 0.047 & 0.218 \\  & pile horizontal displacement & cumulative value & 0.091 & 0.187 & 0.209 & 0.082 & 0.432 \\  & rate of change & 0.095 & 0.185 & 0.243 & 0.092 & 0.384 \\ \hline \multirow{4}{*}{C11} & surface settlement & cumulative value & 0.128 & 0.327 & 0.165 & 0.087 & 0.293 \\  & rate of change & 0.121 & 0.302 & 0.173 & 0.086 & 0.318 \\  & groundwater level & cumulative value & 0.077 & 0.013 & 0.528 & 0.254 & 0.129 \\  & rate of change & 0.109 & 0.103 & 0.575 & 0.207 & 0.006 \\  & pile horizontal displacement & cumulative value & 0.091 & 0.028 & 0.618 & 0.238 & 0.025 \\ \cline{2-6}  & rate of change & 0.084 & 0.027 & 0.535 & 0.258 & 0.097 \\  & cumulative value & 0.019 & 0.000 & 0.000 & 0.881 & 0.100 \\  & surface settlement & rate of change & 0.015 & 0.000 & 0.000 & 0.885 & 0.100 \\ C14 & groundwater level & cumulative value & 0.076 & 0.005 & 0.587 & 0.238 & 0.094 \\  & rate of change & 0.049 & 0.000 & 0.321 & 0.229 & 0.400 \\  & pile horizontal displacement & cumulative value & 0.026 & 0.000 & 0.003 & 0.874 & 0.096 \\  & rate of change & 0.032 & 0.000 & 0.009 & 0.845 & 0.114 \\ \hline \multirow{4}{*}{C15} & surface settlement & cumulative value & 0.101 & 0.046 & 0.639 & 0.210 & 0.003 \\  & rate of change & 0.094 & 0.053 & 0.566 & 0.249 & 0.038 \\  & groundwater level & cumulative value & 0.098 & 0.211 & 0.132 & 0.073 & 0.486 \\  & rate of change & 0.120 & 0.299 & 0.166 & 0.085 & 0.330 \\  & pile horizontal displacement & cumulative value & 0.089 & 0.015 & 0.661 & 0.225 & 0.011 \\  & rate of change & 0.059 & 0.000 & 0.484 & 0.223 & 0.233 \\ \hline \multirow{4}{*}{C18} & surface settlement & cumulative value & 0.226 & 0.628 & 0.060 & 0.083 & 0.003 \\  & rate of change & 0.238 & 0.669 & 0.019 & 0.070 & 0.004 \\  & groundwater level & cumulative value & 0.103 & 0.240 & 0.240 & 0.094 & 0.323 \\  & rate of change & 0.257 & 0.592 & 0.012 & 0.061 & 0.078 \\  & pile horizontal displacement & cumulative value & 0.234 & 0.691 & 0.005 & 0.061 & 0.010 \\  & rate of change & 0.235 & 0.687 & 0.009 & 0.065 & 0.005 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: BPA for indicators at monitoring points on day 21.  
ment), each of which corresponds to two secondary indicators (cumulative value and rate of change). So, there are a total of six evidences for monitoring point C1. For monitoring point C1, the fusion of the early-warning probabilities of the six evidence pieces at the same moment gives the final early-warning level. It can be described as follows. Step (1). Early-warning results from a single source of information. Early-warning results for a single source of information can be obtained by grading the cumulative values and rates of change according to Table 4. We let the GPR (5,3) model predict the data of surface settlement. It can be seen that the predicted cumulative value and rate of change on day 21 are 26 mm and 2.84 mm/d, corresponding to k1 = 0.867, k2 = 0.947, respectively. From the early-warning classification criteria, the early-warning level for surface settlement (E1) is orange.