The Analysis of Time-Space Effect of Surrounding Rock Deformation of TBM Tunnels in Deep Composite Stratum with or without Support

Figure 9

Main test image of unsupported mode. (a) 0.25 MPa. (b) 0.40 MPa. (c) 0.52 MPa. (d) 0.55 MPa.

(a)

(b)

(c)

(d)