Research Article
Intelligent Early Warning System for Construction Safety of Excavations Adjacent to Existing Metro Tunnels
Table 1
Summary of factors affecting safety risks.
| | Primary factors | Secondary factors | Factor categories |
| | Characteristics of the foundation pit | Real-time depth of excavation point (a) | Variable factors | | Real-time width of excavation point (b) | | Real-time length of excavation point (h) | | Horizontal distance from an excavation point to a tunnel section (d) | | Vertical distance between an excavation point and tunnel (v) | | Excavation time (t) |
| | Support methods for the excavation | Parameters related to the diaphragm wall | | Parameters related to soil stabilization | | Parameters related to anchorages | | Parameters related to the supporting structure |
| | Construction scheme | Construction technology | | Construction procedure | | Loads outside the pit |
| | Soil properties | Soil density (γ) | Constant factors | | Internal friction angle (ψ) | | Cohesive force (c) | | Static lateral pressure coefficient (k) | | Compressive modulus (E) |
| | Characteristics of existing metro tunnels | Structural strength of the tunnel | | Structural cracking degree of the tunnel | | Embedded depth of the tunnel |
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