Table 5 The coefficient (ζ) of the cumulative deformation (y).

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

The distance between the measuring point and the excavation surface (D)

1B

2B

3B

4B ~ 4B

ζ

0.5

0.75

0.85

1

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