Research Article

Uncertainty Analysis on Risk Assessment of Water Inrush in Karst Tunnels

Table 4

Parameters of probabilistic distribution for index .

Mean Standard deviation σ

Formation lithology751.5
Unfavorable geological conditions601.5
Groundwater level (m)>751.5
Landform and physiognomy (proportion of negative landform area)401.5
Modified strata inclination (°)161.5
Contact zones of dissolvable and insoluble rock701.5
Layer and interlayer fissures651.5