Research Article

The Influence of Hydraulic Conditions on the Stability of Dual Circular Tunnels in Unsaturated Soils

Figure 21

Collapse mechanisms of dual tunnels in clay subject to water infiltration: (a) q = 0, (b) q = −1.57 × 10−8 m/s, and (c) q = −3.14 × 10−8 m/s.
(a)
(b)
(c)