Rapid Assessment and Classification for Seismic Damage of Mountain Tunnel Based on Concentric Circle Method
Table 3
Discretized assessment index and description of portal and slope damage.
Damage level
Seismic damage description
Discrete value
Extremely severe
Extensive failure of slope; extremely severe mountain collapse, landslide and rock fall; completely buried tunnel portal; extremely severe damage of portal structure (extensive cracks, extremely severe tilt, and subsidence); completely impassable traffic
4
Severe
Local failure of slope; large-scale mountain collapse, landslide and rock fall; most part of tunnel portal is buried; severe damage of portal structure (local cracks, severe tilt, and subsidence); impassable traffic
3
Moderate
Notable cracks of slope; medium-scale rock fall; massive gravel or large stone piles up in front of portal; moderate damage of portal structure (local cracks, moderate tilt, and subsidence); passable traffic after small-scale remediation
2
Slight
No crack on slope surface; small-scale rock fall; sparse gravels or small stones piles up in front of tunnel portal; slight damage of portal structure (slight cracks and tilt); passable traffic
1
Undamaged
Undamaged tunnel portal and slope; smooth traffic; no abnormal phenomenon
