Influence of Support Parameter and Excavation Methods on Statistical Distribution Characteristics of Surrounding Rock Pressure in Shallow-Buried Metro Tunnel

Figure 5

Stress state of shotcrete lining structure: (a) shotcrete 10 cm, (b) shotcrete 20 cm, (c) shotcrete 30 cm, and (d) shotcrete 60 cm.

(a)

(b)

(c)

(d)