Table 5 Identified accidents and sources of the target project.

From: An interpretable framework for risk management in TBM excavation using expert elicitation integrated with fuzzy set theory

Type

Symbol

Description

Accident

A1

Collapse

A2

Surface settlement

A3

Heaving or blow-out

A4

Mud/water inflow

A5

Cutter head blockage

Source

S1

Faults

S2

Shallow cover depth

S3

Mixed ground

S4

Cross-passage

S5

High water pressure

S6

Weathered ground

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