Research Article

Evolution Mechanism of Deformation and Failure of Surrounding Rock during Excavation and Unloading of the High-Stress Rock Mass

Figure 12

Video capture of the failure process in the sandstone cave wall, , (a) 16′17.12″ (σz = 28.13 MPa), (b) 18′45.37″ (σz = 34.64 MPa), (c) 19′28.26″ (σz = 37.12 MPa), (d) 22′18.18″ (σz = 45.83 MPa), (e) 24′25.16″ (σz = 52.05 MPa), (f) 27′36.38″ (σz = 61.40 MPa), (g) 29′44.12″ (σz = 67.62 MPa), (h) 32′33.25″ (σz = 76.01 MPa), (i) 33′13.22″ (σz = 78.87 MPa), (j) 34′50.48″ (σz = 83.99 MPa).
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