Research Article
The Prediction of Metro Shield Construction Cost Based on a Backpropagation Neural Network Improved by Quantum Particle Swarm Optimization
Table 2
The indicators affecting the metro tunnel construction cost.
| | Primary indicators | Secondary indicators | Type of Indicator |
| | Project aspects | Type of shield machine (X1) | Quantitative | | Geological features (X6) | Qualitative | | Number of times of shield machine entering and leaving the site (X9) | Quantitative | | Segment thickness (X10) | Quantitative |
| | Construction conditions | Construction period (X11) | Quantitative | | Environmental characteristics (X12) | Qualitative |
| | Technical standard | Tunnel structure (X15) | Quantitative |
| | Project management | Project management ability of the owner (X16) | Qualitative | | Project management ability of the construction company (X17) | Qualitative | | Financing structure of the project (X18) | Quantitative |
|
|
