Rapid Assessment and Classification for Seismic Damage of Mountain Tunnel Based on Concentric Circle Method

Figure 10

The main seismic damage of the left line of Longxi tunnel: (a) severe upheaval and tensile fractures of the invert arch pavement at LK21 + 521∼552, (b) collapse of the arch secondary lining at LK21 + 540∼558, (c) collapse of surrounding rock and lining at LK21 + 670∼695, and (d) huge rock falls at Longxi tunnel.

(a)

(b)

(c)

(d)