Table 4 Classified states of monitoring measurement data.

From: A multi-source information fusion approach in tunnel collapse risk analysis based on improved Dempster–Shafer evidence theory

Tunnel collapse level

I (safe)

II (deformation)

III (small-scale collapse)

IV (large-scale collapse)

Daily deformation rate (mm/day)

0 ≤ x < 2

2 ≤ x < 5

5 ≤ x < 10

10 ≤ x ≤ 20

Cumulative deformation (mm)

0 ≤ y < 50

50 ≤ y < 100

100 ≤ y < 200

200 ≤ y ≤ 300

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