A New Bayesian Network Model for the Risk Assessment of Water Inrush in Karst Tunnels

Table 16

Overview of the value of each input index.

	Topography and geomorphology	Contact zones of dissolvable and insoluble rock	Formation lithology	Unfavorable geology	Interlayer fissure
No rainfall	II (medium)		II (medium)	II (medium)	II (medium)
Heavy rainfall	II (medium)		II (medium)	II (medium)	II (medium)
	Attitude of rock	Groundwater table	Rainfall in a week	Excavation disturbance	Support measures
No rainfall	II (medium)		IV (none)	II (medium)	IV (strong)
Heavy rainfall	II (medium)		II (medium)	II (medium)	IV

The value of the index is unknown, such as contact zones of dissolvable and insoluble rock and groundwater table.