# Research on an Evaluation Method for the Adaptability of TBM Tunnelling
## 4 Case Study
### TBM Tunnelling Adaptability Evaluation
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline
**Section** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** & **10** & **11** & **12** & **13** \\ \hline K112+000-K114+000 & 7.1 & 2224 & 17,000 & 18,500 & 16,320 & 94 & 17.3 & 7.8 & 0.81 & 2.4 & 0.033 & 0.6 & 3.6 \\ K2+310-K4+310 & 6.0 & 1770 & 8877 & 9950 & 8400 & 68 & 14.2 & 7.0 & 0.55 & 1.1 & 0.022 & 0.1 & 1.9 \\ K18+500-K20+500 & 6.2 & 840 & 7840 & 9300 & 7400 & 70 & 15.5 & 5.5 & 0.42 & 7.2 & 0.170 & 5.5 & 3.1 \\ \hline \end{tabular}
\end{table} 
Table 18: Parameters required for evaluation. \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline
**Section** & **1** & **2** & **3** & **4** & **5** & **6** & **7** & **8** & **9** & **10** & **11** \\ \hline K112+000-K114+000 & 1 & 0.85 & 0.688 & 0.819 & 0.4 & 0.2 & 0.311 & 0.709 & 1 & 0.9 & 1 \\ K2+310-K4+310 & 1 & 0.91 & 0.692 & 1 & 1 & 0 & 0.689 & 0.873 & 1 & 0.8 & 1 \\ K18+500-K20+500 & 1 & 0.88 & 0.79 & 1 & 0.7 & 0 & 0.422 & 0.07 & 1 & 0 & 1 \\ \hline \end{tabular}
\end{table} 
Table 19: Adaptability value of each evaluation index. the surrounding rock of the K112+000-K114+000 section has good stability and is relatively hard, with less adverse geological conditions and less faults during TBM excavation, but the cutter wear is serious and the penetration rate is slow. K2+310-K4+310 section:  
\[\left( \begin{array}{c}1\\ 0.91\\ 0.692\\ 1\\ 1\\ 0\\ 0.689\\ 0.873\\ 1\\ 0.8\end{array} \right)^{T}\ \left( \begin{array}{c}0.0382\\ 0.0712\\ 0.1025\\ 0.1571\\ 0.1571\\ 0.0405\\ 0.0402\\ 0.1437\\ 0.0606\\ 0.0946\\ 0.0951\end{array} \right)=0.87 \tag{36}\]  
After calculation, the TBM tunnelling adaptability value of a section of K2+310-K4+310 is 0.87, which belongs to being adaptable. The surrounding rock of the K2+310-K4+310 section has good stability, moderate rock hardness, less adverse geological conditions, and less faults during TBM excavation, while the cutter wear is within the normal range, and the penetration rate is fast. K18+500-K20+500 section:  
\[\left( \begin{array}{c}1\\ 0.88\\ 0.79\\ 1\\ 0.7\\ 0.422\\ 0.07\\ 1\\ 0\\ 1\end{array} \right)^{T}\ \left( \begin{array}{c}0.0382\\ 0.0712\\ 0.1025\\ 0.1571\\ 0.0405\\ 0.0402\\ 0.1437\\ 0.0606\\ 0.0946\\ 0.0951\end{array} \right)=0.63 \tag{37}\]  
After calculation, the TBM tunnelling adaptability value of a section of K18+500-K20+500 is 0.63, which belongs to being slightly adaptable. The surrounding rock of the K18+500-K20+500 section has poor stability and high rock hardness, and there are large faults, water intrushes, and large deformations of the surrounding rock during excavation. In order to prevent the influence of adverse geological conditions, more support measures are taken during TBM excavation, but the shutdown time is long, and the penetration rate is slow due to excessive water intrushes. Through comparative analysis, the method proposed in this paper can be used to evaluate the TBM tunnelling adaptability of three interval tunnels in Xinjiang hydraulic engineering, and the evaluation results are consistent with the actual situation.