The Progressive Failure Mechanism of the Tunnel-Slope System under Rainfall: An Experimental Investigation

Figure 13

The analysis of stability of the tunnel during excavation.

(a) First excavation

(b) Second excavation

(c) Third excavation

(d) Fourth excavation

(e) Fifth excavation

(f) Sixth excavation

(g) Seventh excavation

(h) Eighth excavation

(i) Ninth excavation

(j) Water inrush from tunnel

(k) Tunnel excavation footage