Quantitative Inversion of Water-Inrush Incidents in Mountain Tunnel beneath a Karst Pit

Figure 12

Relationship between objective function and the permeability coefficient of the tunnel surrounding rock: (a) No. 1 water-inrush incident; (b) No. 2 water-inrush incident; (c) No. 3 water-inrush incident.

(a)

(b)

(c)