## 3 Prediction Results of Mining Surface Subsidence of Northern Pei County for Reusing Land Resources
### Situation Analysis of Coal Mining Subsidence in the Northern Pei County by the End of 2014  
The accumulated surface subsidence situations in each mine by the end of 2014 are calculated by the probability integral approach based on the mining engineering plan and the influence of geological and mining conditions on the prediction parameters and the fundamental prediction parameters. Table 4 gives the maximum surface movement and deformation of the mines in northern Pei County. Table 4 indicates that the maximum surface subsidence prediction value in the mining areas of northern Pei County is 7498 mm located above Yaoqiao mine, while the minimum value is 1379 mm located above Peicheng mine. The surface subsidence has a serious influence on the local landform and ecological structure. Figure 3 demonstrates the subsidence area of the different subsidence range in the mines of northern Pei County, and Figure 4 shows the subsidence area for the mines of Pei County. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Mine**} & \multirow{2}{*}{**Subsidence**} & \multicolumn{2}{c}{**Horizontal Movement**} & \multicolumn{2}{c}{**Horizontal Deformation**} & \multicolumn{2}{c}{**Inclination Deformation**} & \multicolumn{2}{c}{**Curvature Deformation**} \\ \cline{3-10}  & & **(mm)** & & **(mm/m)** & & **(mm/m)** & & **(mm/m)** \\ \cline{3-10}  & & **North-South** & **East-West** & **North-South** & **East-West** & **North-South** & **East-West** & **North-South** & **East-West** \\  & & **Direction** & **Direction** & **Direction** & **Direction** & **Direction** & **Direction** & **Direction** & **Direction** & **Direction** \\ \hline [PERSON] & 7498 & 2054 & 1991 & 31 & 19 & 35 & 37 & 0.49 & 0.39 \\ [PERSON] & 6107 & 1669 & 1792 & 31.1 & 29.6 & 47.3 & 47.8 & 0.96 & 0.84 \\ [PERSON] & 5585 & 1502 & 1982 & 35.2 & 41.9 & 23.3 & 17.0 & 0.55 & 0.37 \\ [PERSON] & 5400 & 1800 & 2000 & 25 & 30 & 30 & 22 & 0.6 & 0.4 \\ [PERSON] & 5801 & 1820 & 1284 & 16.14 & 10.13 & 24.34 & 16.49 & 0.21 & 0.14 \\ [PERSON] & 3948 & 1073 & 1118 & 10.8 & 15.0 & 21.6 & 23.6 & 0.23 & 0.32 \\ [PERSON] & 1868 & 869 & 768 & 7.1 & 7.1 & 5.7 & 5.5 & 0.06 & 0.08 \\ [PERSON] & 1379 & 410 & 400 & 5.46 & 5.91 & 7.02 & 6.48 & 0.24 & 0.13 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: The maximum surface movement and deformation of mines in northern Pei County. Figure 3: The subsidence area of different subsidence range in mines of northern Pei County. \begin{table}
\begin{tabular}{c c} \hline \hline
**Parameters** & **[PERSON] and [PERSON]** \\ \hline Subsidence coefficient & 0.72 \\ Horizontal movement coefficient & 0.32 \\ Tangent of major influence angle & 2.0 \\ Inflection point offset & 0.1H \\ Mining influence propagation angle & 90\({}^{\circ}\)\(-\)0.5a \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Fundamental prediction parameters of the coal mines affiliated with Xuzhou Coal Mining Group. Figures 3 and 4 show that the accumulated subsidence area of mines in northern Pei County is 12,151.6 hectares by the end of 2014. Yaoqiao mine has the largest subsidence area, and the subsidence area is 3855.9 hectares, while the subsidence area of Peicheng mine is the least, and the subsidence area is 654.2 hectares. Meanwhile, the surface movement and deformation contour of the mines in northern Pei County can be obtained according to the prediction results. Due to the paper length, only the surface subsidence contour of the Longdong mine is given, as shown in Figure 5.  
Figure 5 suggests that the current situations of the subsidence area above the mines displayed by the image are consistent with the subsidence prediction findings. With the high groundwater level in northern Pei County, it is easy to form the water accumulated area in the larger subsidence area and even form a larger area of the subsidence lakes as shown in the black areas of Figure 5. The subsidence land can be reasonably planned and recycled according to the prediction outcomes of the large area of surface subsidence in northern Pei County.