Instability Mechanism of Cavity-Bearing Formation under Tunnel Excavation Disturbance

Figure 10

Instability evolution process of stratum without cavity. (a) P = 0 MPa. (b) P = 0.02 MPa. (c) P = 0.04 MPa. (d) P = 0.06 MPa. (e) P = 0.08 MPa.

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